Ceramic continuous fiber cloth

Abstract

The purpose of the present invention is to provide at least one among: a ceramic continuous fiber cloth from which a CMC that is less susceptible to creep rupture at high temperature compared to conventional CMCs is obtained; a production method therefor; a ceramic matrix composite material containing the same; and a production method therefor.　This ceramic continuous fiber cloth is characterized by containing doped metal elements, wherein: the average value of the unit contents of the doped metal elements is 10-1,000 ppm by mass; and the variation coefficient of the unit contents of the doped metal elements is less than 0.48.

Description

Ceramic continuous fiber cloth 【0001】 This disclosure relates to ceramic continuous fiber cloth and ceramic matrix composite materials containing the same. 【0002】 Ceramic matrix composite materials (hereinafter also referred to as "CMC"), which are composites of continuous ceramic fibers and a ceramic matrix, possess excellent heat resistance and higher damage tolerance compared to conventional ceramics. For this reason, research is underway to apply CMC as a substitute material for heat-resistant metals such as Ni-based alloys in aircraft jet engine components and other applications. 【0003】 For example, Patent Document 1 discloses a continuous fiber cloth of oxide ceramics containing trace amounts of metal elements at the grain boundaries, and a CMC made of alumina and silica matrix, and discloses that such a CMC exhibits high strength. 【0004】 U.S. Patent Application Publication No. 2023 / 0357088 【0005】 In recent years, there has been a growing demand for further improvements in creep rupture of CMC at high temperatures exceeding 1000°C, particularly in applications such as aircraft jet engine components. 【0006】 The present disclosure aims to provide a ceramic continuous fiber cloth that provides a ceramic molten metal (CMC) that is less susceptible to creep rupture at high temperatures compared to conventional CMCs, a method for manufacturing the same, and at least one ceramic matrix composite material containing the same, and a method for manufacturing the same. 【0007】 This disclosure investigates the improvement of creep rupture in CMC at high temperatures, focusing on the ceramic continuous fiber cloth contained in CMC, particularly its composition. As a result, it was found that the metal elements doped into the ceramic continuous fiber cloth affect creep rupture when the cloth is converted into CMC. Furthermore, it was found that by controlling the state of the metal elements in the ceramic continuous fiber cloth, the resulting CMC becomes less susceptible to creep rupture at high temperatures. 【0008】In other words, the present invention is as described in the claims, and the gist of this disclosure is as follows: [1] A ceramic continuous fiber cloth comprising a doped metal element, wherein the average unit content of the doped metal element is 10 ppm by mass or more and 1000 ppm by mass or less, and the coefficient of variation of the unit content of the doped metal element is less than 0.48. [2] The ceramic continuous fiber cloth according to [1], wherein the doped metal element is one or more selected from the group consisting of rare earth elements, zirconium (Zr), chromium (Cr), and magnesium (Mg). [3] The ceramic continuous fiber cloth according to [1] or [2], wherein the ceramic continuous fiber cloth is one or more selected from the group consisting of silicon carbide fiber cloth, alumina fiber cloth, mullite fiber cloth, and alumina and mullite mixed fiber cloth. [4] The ceramic continuous fiber cloth according to any one of [1] to [3], wherein the average thickness is 0.2 mm or more. [5] A ceramic continuous fiber cloth according to any one of [1] to [4] above, comprising ceramic continuous fibers having a single fiber strength of 1.0 GPa or more. [6] A ceramic continuous fiber cloth according to any one of [1] to [5] above, comprising ceramic continuous fibers having a standard deviation of single fiber strength of 0.7 GPa or less. [7] A ceramic continuous fiber cloth according to any one of [1] to [6] above, wherein the ceramic continuous fiber cloth is at least one of an alumina fiber cloth containing zirconium, and an alumina and mullite mixed fiber cloth containing one or more selected from the group consisting of ytterbium, chromium, and yttrium. [8] A method for producing a ceramic continuous fiber cloth according to any one of [1] to [7] above, comprising contacting a ceramic continuous fiber cloth with a solution containing a metal acetylacenate complex to obtain a complex-containing cloth, washing the complex-containing cloth to obtain a washing cloth, and heat-treating the washing cloth. [9] The manufacturing method according to [8], wherein the washing is agitation of the washing solution.

[10] The manufacturing method according to [8] or [9], wherein the washing is agitation of the washing solution while the complex-containing fiber cloth is laminated.

[11] The manufacturing method according to [9] or

[10] , wherein the cleaning solution is one or more selected from methanol, ethanol, propanol, acetone, tetrahydrofuran, benzene, water, and heavy water.

[12] The manufacturing method according to any one of [8] to

[11] , wherein the cleaning cloth is preheated by heat treatment at 500°C or more and less than 950°C, and then heat-treated at 950°C or more and 1300°C or less.

[13] A ceramic matrix composite material comprising a ceramic continuous fiber cloth according to any one of [1] to [7].

[14] A manufacturing method for a ceramic matrix composite material comprising compounding a ceramic continuous fiber cloth according to any one of [1] to [7] with a ceramic matrix. 【0009】 This disclosure provides a ceramic continuous fiber cloth that gives a CMC that is less susceptible to creep rupture at high temperatures compared to conventional CMCs, a method for manufacturing the same, and at least one ceramic matrix composite material containing the same, and a method for manufacturing the same. 【0010】 Schematic diagram showing the method for cutting out the sample for unit content measurement. Schematic diagram showing the test piece used in the tensile strength test. STEM observation diagram of the ytterbium-containing alumina and mullite mixed fiber cloth of Example 2. Figure 3: Distribution of characteristic X-ray spectral intensity from point A to point C ((a) oxygen, (b) aluminum, (c) silicon, and (d) ytterbium). 【0011】 An example of an embodiment of the ceramic continuous fiber cloth of this disclosure will be described. The terms used in this embodiment are as follows. Furthermore, this disclosure includes any combination of each configuration and parameter disclosed herein, as well as any combination of the upper and lower limits of the values ​​disclosed herein. 【0012】A "ceramic matrix composite material" (CMC) is a composite material in which ceramics are reinforced with ceramic fibers, and is a material in which continuous ceramic fibers and a ceramic matrix are combined, so-called ceramic fiber reinforced ceramics. In particular, the CMC in this embodiment is a ceramic composite material that includes a continuous ceramic fiber cloth as a reinforcing material. 【0013】 A "ceramic matrix" is the matrix (premium phase) of a CMC made of ceramics, and is essentially composed of ceramic crystalline particles (hereinafter also simply referred to as "crystalline particles"). 【0014】 "Ceramic continuous fiber cloth" (hereinafter also referred to as "fiber cloth") is a woven fabric of ceramic continuous fibers, a woven fabric of fiber bundles of ceramic continuous fibers, and in particular, a woven fabric of fiber bundles of ceramic continuous fibers in a cloth-like form. 【0015】 "Continuous ceramic fibers" (hereinafter also simply referred to as "continuous fibers") are ceramic fibers with a fiber length of 10 cm or more. Ceramic fibers with a fiber length of less than 10 cm are referred to as "short ceramic fibers." 【0016】 "Ceramic fiber" refers to spun polycrystalline ceramics, or more specifically, filamentous polycrystalline ceramics, which are fibers composed of crystalline particles. "Fiber bundle" is an aggregate of two or more ceramic fibers. Furthermore, "ceramic mixed fiber" refers to a ceramic fiber having a mixed structure of two or more crystalline particles, and "ceramic mixed continuous fiber" refers to a ceramic continuous fiber having a mixed structure of two or more crystalline particles. 【0017】 "Doped metal elements" (hereinafter also referred to as "doped metals") are metal elements contained in textile cloth, which are metal elements contained in textile cloth other than the metal elements that make up spun polycrystalline ceramics (ceramic fibers), and which are metal elements contained in textile cloth as compounds with a longest diameter of less than 1 nm. 【0018】"Unit content of doped metal element" (hereinafter, also simply referred to as "unit content") refers to the content of doped metal in a certain area of the fiber cloth, and is the content of doped metal in an area (unit area) that is 0.04 area% or more and 20 area% or less with respect to the total area of the fiber cloth. The unit content is a value obtained as the mass ratio [mass ppm] of doped metal per 1 g of the fiber cloth, which is measured by ICP emission spectroscopy under the following conditions. Frequency: 27 MHz Output: 1.2 kW Detector: CCD detector Sample introduction: Cyclone nebulizer 【0019】 ICP emission spectroscopy can be performed using a general ICP emission analyzer (for example, 5800 ICP-OES, manufactured by Agilent Technologies), and a solution obtained by dissolving the fiber cloth by pressurized sulfuric acid decomposition under the following conditions may be used as the measurement solution. Heating temperature: 250 °C ± 50 °C Heating time: 100 hours ± 50 hours 【0020】 "Average value of unit content of doped metal element" (hereinafter, also referred to as "W ＡＶ "), "Standard deviation of unit content of doped metal element" (hereinafter, also referred to as "W ＳＤ "), and "Coefficient of variation of unit content of doped metal element" (hereinafter, also referred to as "W ＣＶ ") are, respectively, the average value [mass ppm], standard deviation [mass ppm], and the value obtained by dividing the standard deviation by the average value [mass ppm / mass ppm] of the unit content in the fiber cloth, and have the following relationship. 【0021】 W ＣＶ = W ＳＤ / W ＡＶ W ＡＶ 、W ＳＤ and W ＣＶ are values obtained from the unit contents of a total of 5 unit areas, which consist of a unit area including the center of gravity of the fiber cloth and 4 unit areas including points at equal intervals from the center of gravity. 【0022】Samples for measuring unit content can be prepared as follows. For example, in the case of a fiber cloth with a square or rectangular shape as shown in Figure 1, it can be divided into three sections vertically and horizontally (divided by the dotted lines in Figure 1), and of the nine resulting cut pieces, five pieces in total—one containing the center of gravity and four containing the four corners—can be designated as cut pieces (10). Next, each of the resulting cut pieces (10) can be cut into a square shape including its center of gravity to form a measurement piece (11 in Figure 1). The measurement pieces should be cut so that the area of ​​each measurement piece is between 0.04% and 20% of the total area of ​​the fiber cloth. Dissolving each measurement piece will prepare a measurement solution for ICP emission spectroscopy analysis. Furthermore, in the case of circular or polygonal fiber cloths, cut pieces can be obtained by dividing the diameter of the inscribed circle into three parts and dividing the diameter of the inscribed circle perpendicular to the aforementioned diameter into three parts. Of the nine cut pieces obtained, five points in total—one containing the center of gravity and four containing the four corners—can be selected as cut pieces, and the measurement solution can be obtained in the same manner. 【0023】 The "average particle size" is the median diameter (D50) in the volume particle size distribution of a powder, measured according to JIS R 1629 using a general laser diffraction / scattering particle size distribution analyzer (e.g., MT3300EX-II, manufactured by Microtrac Bell). Specifically, the measurement should be performed under the following conditions: Light source: Semiconductor laser Voltage: 780mW Refractive index of alumina: 1.77 Refractive index of zirconia: 2.17 Refractive index of silica: 1.48 Refractive index of solvent (water): 1.33 Calculation mode: MT3000EXII 【0024】 "BET specific surface area" is the specific surface area measured in accordance with JIS Z 8830 using a general gas adsorption measurement device (e.g., BELSORP MR6, manufactured by MICROTRAC). Specifically, it can be measured using the following BET single-point method with a carrier gas method using nitrogen as the adsorption gas. Adsorption medium: N ２ Adsorption temperature: -196°C Pretreatment conditions: Air atmosphere, treatment at 200°C for 25 minutes 【0025】 "CMC density" refers to the measured density value of CMC measured according to the method conforming to JIS R 1634, and is the mass [g / cm³] measured using an electronic balance relative to the volume determined by the Archimedes method. ３ This is the density obtained from [the formula]. Prior to measurement, the mass of the dried CMC should be measured, then the CMC should be placed in water, boiled for 3 hours, and left to stand at room temperature for 6 hours or more as a pretreatment. 【0026】 "Fiber volume fraction" refers to the volume percentage [volume %] of fiber cloth in the CMC, and is a value obtained from SEM observations of the cross-section of the CMC. ｆａｖｅ The SEM observation images used for the measurement of ) can be any SEM observation images obtained by SEM observation using a general scanning electron microscope (e.g., JSM-7600F, manufactured by JEOL Ltd.) under the following conditions: Acceleration voltage: 5kV Observation magnification: 130x 【0027】 The cross-section of the CMC, cut into a plate-like shape measuring 8 ± 1 mm in width and 6 ± 1 mm in length, can be used as the observation surface for SEM observation. 【0028】 The SEM observation image is binarized using general image analysis software (e.g., ImageJ, manufactured by the National Institutes of Health, USA), and the resulting binarized image is analyzed to determine the fiber volume fraction (V) in a certain region of the fiber cloth. ｆ ) is also called. ) should be calculated. The unit fiber volume fraction can be calculated from the following formula, considering the white area in the binarized diagram as the fiber cloth and the black area as the ceramic matrix. V ｆ = A ｆ / (A ｆ +A ｍ ) × 100 (1) 【0029】 (1) In equation, V ｆ is the unit fiber volume fraction [volume %], A ｆ The area of ​​the fiber cloth (white area) [m²] ２ ], and A ｍ The area of ​​the ceramic matrix (black region) is [m²] ２ ] 【0030】 Ten or more, preferably 15 ± 5 V ｆ The average value [volume %] of the fiber volume ratio (V ｆａｖｅ ) is the correct approach. 【0031】 "Single fiber strength" is one of the indicators of the strength of the continuous fibers that make up the fiber cloth. It is a value obtained using a general strength testing machine (e.g., AG-XPlus, manufactured by Shimadzu Corporation) and a tensile testing fixture according to the method conforming to JIS R 1657. For measurement, the gauge length should be 25 mm. The tensile strength should be measured 30 times with a loading speed of 0.5 mm / min, and the average value should be taken as the single fiber strength [GPa], and the standard deviation of this average value should be taken as the standard deviation of single fiber strength. The sample to be measured should be a single continuous fiber obtained by unraveling the fiber cloth, and a length of 50 mm should be used. 【0032】 "Tensile strength" is the strength value obtained using a general strength testing machine (e.g., MTS Criterion, manufactured by MTS) and a tensile testing fixture, in accordance with the ASTM C1275 method. The tensile strength can be taken as the average value obtained by measuring the tensile strength twice at a loading speed of 0.5 mm / min. 【0033】 As shown in Figure 2, prior to measurement, a plate-shaped CMC should be processed into a dogbone shape with a longitudinal length (200a) of 200 ± 1 mm, a longitudinal end width (200b) of 10 ± 1 mm, a gauge section indicated by a dashed line with a longitudinal length (200c) of 40 mm ± 1 mm, a gauge section width (200d) of 8 mm ± 1 mm, and a thickness of 2 ± 1 mm. Aluminum tabs should be attached to both ends of the CMC to create a test specimen. The width and thickness of the test specimen should be measured with a micrometer, and the length of the test specimen should be measured with calipers. 【0034】"Creep rupture time" is one indicator of creep rupture; a shorter creep rupture time indicates a higher likelihood of creep rupture. In this embodiment, the creep rupture time is the time until rupture occurs due to the creep phenomenon, and is a value obtained using a general mechanical property evaluation tester (e.g., MTS Landmark, manufactured by MTS Corporation) according to the ASTM C1337 method. The creep rupture time can be the average value obtained by measuring the creep rupture time twice under the following conditions: Heating rate: 35°C / min Applied stress: 100 MPa Stress rate: 15 MPa / second 【0035】 The creep rupture time should be measured at 1200°C for one or more fiber cloths selected from the group consisting of silicon carbide fiber cloth, alumina and mullite mixed fiber cloth, and silicon nitride fiber cloth, as well as other fiber cloths applied to high-temperature components. For other ceramic fiber cloths, the measurement should be taken at 1000°C. The same CMC sample used for tensile testing should be used for the creep rupture time measurement. 【0036】 [Continuous Ceramic Fiber Cloth] The fiber cloth of this embodiment contains doped metal elements, the average unit content of the doped metal elements is 10 ppm by mass or more and 1000 ppm by mass or less, and the coefficient of variation of the unit content of the doped metal elements is less than 0.48 (hereinafter, the fiber cloth containing doped metal elements will also be called "dope cloth"). As a result, the CMC containing the fiber cloth of this embodiment is less susceptible to creep deformation and associated creep rupture at high temperatures. 【0037】One possible reason for this is as follows: Doped cloth has higher heat resistance compared to fiber cloth that does not contain doped metal. Furthermore, creep deformation is less likely to occur due to the displacement of grain boundaries (hereinafter also referred to as "grain boundaries") in the crystalline particles of ceramics, so-called "grain boundary slippage." Because the doped metal is in the state described above, the diffusion of the doped metal is further promoted, and it is thought that the doped metal diffuses into the spaces between the crystalline particles constituting the continuous fibers, especially between the crystalline particles inside the continuous fibers. In this state, the reaction between the doped metal and the crystalline particles proceeds, and it is thought that the doped metal is contained between the crystalline particles in a state so fine that it is difficult to detect, without forming continuous reaction products such as a coating layer. Due to this appropriate reaction between the crystalline particles and the doped metal, and the pinning effect of the reaction products produced thereby, grain boundary slippage is less likely to occur. As a result, the CMC containing the fiber cloth of this embodiment exhibits high heat resistance, and creep deformation is suppressed, making creep rupture, especially creep rupture at high temperatures, less likely to occur. 【0038】 The fiber cloth of this embodiment contains doped metal. This increases the heat resistance of the continuous fiber cloth. In this embodiment, it is preferable that the fiber cloth contains doped metal at the grain boundaries of the crystal grains that make up the continuous fibers. By including doped metal at the grain boundaries, grain boundary slippage becomes less likely to occur. 【0039】 In this embodiment, the presence of a doped metal in the fiber cloth of this embodiment can be confirmed by observing a characteristic X-ray spectrum corresponding to the doped metal in transmission electron microscopy-energy dispersive X-ray (hereinafter also referred to as "STEM-EDS") measurements. 【0040】 In this embodiment, STEM-EDS measurements can be performed using a general-purpose transmission electron microscope (e.g., JEM-2100F, manufactured by JEOL Ltd.) and a general-purpose energy-dispersive X-ray spectrometer (e.g., JED-2300T, manufactured by JEOL Ltd.) under the following conditions: Acceleration voltage: 200 kV Observation magnification: 2,000,000x 【0041】STEM observation should be performed on the cross-section of the fiber cloth. 【0042】 The presence of doped metals at grain boundaries can be confirmed by observing characteristic X-ray spectra corresponding to the doped metals at the grain boundaries. Furthermore, the presence of more doped metals at grain boundaries compared to crystal grains can be confirmed by the fact that the intensity of the characteristic X-ray spectra corresponding to the doped metals at the grain boundaries is higher than the intensity of the characteristic X-ray spectra corresponding to the doped metals at the crystal grains. 【0043】 The doped metals contained within the grain boundaries may be compounds, oxides, or reaction products between the doped metal and the fiber cloth (e.g., composite oxides). These reaction products are contained within the fiber cloth in a finer form compared to the crystal grains; for example, the doped metal may be present as reaction products with a longest diameter of less than 1 nm. An example of a composite oxide is a reaction product between silicon and the doped metal (a silicate of the doped metal). The oxide of the doped metal may also be a composite oxide containing two or more doped metals. 【0044】 The fiber cloth of this embodiment is W ＡＶ The concentration is between 10 ppm by mass and 1000 ppm by mass. ＡＶ If the amount is less than 10 ppm by mass, the resulting CMC is prone to grain boundary sliding at high temperatures, and its creep characteristics at temperatures between 1000°C and 1300°C (hereinafter also referred to as "high-temperature creep characteristics") are similar to those of conventional CMC. ＡＶ When the concentration exceeds 1000 ppm by mass, the reaction between the doped metal and the continuous fibers constituting the fiber cloth proceeds excessively, resulting in a non-uniform composition of the crystal grains themselves, and the high-temperature creep properties of the resulting CMC decrease. (See W below) ＣＶ With the conditions met, W ＡＶ As the amount increases, the high-temperature creep characteristics of the resulting CMC tend to improve. Therefore, W ＡＶ It is preferable that the amount is 20 ppm by mass or more, 30 ppm by mass or more, or 50 ppm by mass or more. On the other hand, W ＡＶThe W of the fiber cloth in this embodiment may be 800 ppm or less by mass, 600 ppm or less by mass, 400 ppm or less by mass, 300 ppm or less by mass, or 100 ppm or less by mass. ＡＶ Examples include concentrations of 20 ppm to 800 ppm, 30 ppm to 600 ppm, 50 ppm to 400 ppm, 50 ppm to 300 ppm, or 50 ppm to 100 ppm. 【0045】 The fiber cloth of this embodiment is W ＣＶ It is preferable that it is less than 0.48, and 0.45 or less, 0.40 or less, 0.30 or less, or 0.20 or less. ＣＶ This is one of the indicators that shows the dispersion state of doped metals in fiber cloth (doped cloth), W ＣＶ When this value is taken, the dispersibility of the doped metal is increased, and it is thought that the doped metal is contained in the fiber cloth in a state where the doped metal is dispersed even between the crystal grains inside the continuous fibers, which can improve the high-temperature creep properties. ＣＶ A smaller size is preferable, but W ＣＶ Examples of lower limits include 0 or more, greater than 0, 0.01 or more, 0.05 or more, or 0.10 or more. W of the fiber cloth in this embodiment ＣＶ Examples include values ​​of 0 or more but less than 0.48, greater than 0 but less than 0.48, 0.01 or more but less than 0.48, 0.05 or more but 0.45 or less, or 0.10 or more but 0.40 or less. 【0046】 In this embodiment, the fiber cloth preferably contains a uniform amount of doped metal, and it is preferable that the doped metal does not segregate onto the surface of the fiber cloth, particularly that there is no formation of a coating layer on the surface of the continuous fibers. The formation of a coating layer can be confirmed by observing a metal compound layer of several to several nanometers on the surface of the continuous fibers in a TEM observation of the cross-section of the continuous fibers. 【0047】Doped metals are metallic elements contained in the fiber cloth other than the metallic elements that make up the ceramic fibers (i.e., the metallic elements that make up the crystal grains of the ceramics), and in particular, metallic elements other than aluminum (Al) and iron (Fe), as well as one or more selected from the group consisting of rare earth elements, zirconium (Zr), chromium (Cr), and magnesium (Mg), as well as one or more selected from the group consisting of yttrium (Y), cerium (Ce), samarium (Sm), europium (Eu), gadollium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), zirconium (Zr), chromium (Cr), and magnesium (Mg), as well as one or more selected from the group consisting of yttrium, ytterbium, lutetium, thulium, erbium, zirconium, and chromium. This makes it less likely for the single fiber strength of the continuous fibers constituting the fiber cloth to decrease. The doped metal is preferably one or more selected from the group consisting of yttrium, ytterbium, and chromium, preferably at least one of yttrium and ytterbium, more preferably containing ytterbium, and even more preferably being ytterbium. 【0048】 The fiber cloth of this embodiment may contain one or more doped metals, more than two, more than one and more than four, more than one and more than three, more than one and more than two, or may contain two. Preferred combinations of doped metals include at least two selected from the group consisting of yttrium, ytterbium, and chromium, more than two selected from the group consisting of lutetium, europium, and chromium, and more than ytterbium and chromium. 【0049】The fiber cloth of this embodiment is a fiber cloth composed of continuous fibers (hereinafter, fiber cloths composed of alumina fibers, etc., are also referred to as "alumina fiber cloths," etc.), and any fiber cloth composed of the desired continuous fibers according to the purpose is acceptable. Examples of fiber cloths that constitute the fiber cloth of this embodiment include one or more selected from the group consisting of silicon carbide fiber cloth, alumina fiber cloth, mullite fiber cloth, and alumina and mullite mixed fiber cloth, and further, one or more selected from the group consisting of alumina fiber cloth, mullite fiber cloth, and alumina and mullite mixed fiber cloth, and further, at least one of alumina fiber cloth and alumina and mullite mixed fiber cloth. Alumina fiber cloth is used as a fiber cloth when high strength is the objective, and alumina and mullite mixed fiber cloth is used as a fiber cloth when higher high temperature characteristics are the objective. Preferred alumina and mullite mixed fiber cloth contains α-alumina and mullite, and also Al ２ O ３ Examples include textile cloths having an equivalent Al content of 80% by mass or more and 95% by mass or less. 【0050】 The presence of α-alumina or mullite in the fiber cloth can be confirmed by analyzing the XRD pattern of the fiber cloth. 【0051】 XRD patterns can be measured using a general-purpose X-ray diffractometer (e.g., Ultima IV, manufactured by RIGAKU). The following conditions are used for measurement: Source: CuKα rays (λ = 0.15418 nm) Measurement mode: Continuous scan Scan speed: 2° / min Measurement range: 2θ = 10° to 80° Acceleration voltage / current: 40mA / 40kV Divergence longitudinal limiting slit: 10 mm Divergence / incident slit: 1° Receiving slit: open Detector: Semiconductor detector (D / teX Ultra) Filter: Ni filter Goniometer radius: 185 mm 【0052】The XRD pattern obtained under the above measurement conditions can be analyzed using the analysis program included with the X-ray diffractometer (for example, the integrated powder X-ray analysis software PDXL Ver. 2.2, manufactured by RIGAKU Corporation). The following conditions can be used for analysis: Peak shape: Split pseudo-Voigt function Background processing: Straight line connecting the endpoints 【0053】 In the analysis of XRD patterns, the crystalline phase can be identified by comparing the measured XRD pattern with a common database (e.g., PDF-2, from the International Centre for Diffraction Data). 【0054】 The composition of the fiber cloth can be determined by X-ray fluorescence analysis using a general-purpose X-ray fluorescence analyzer (e.g., ZSM Primus II, manufactured by RIGAKU Corporation) under the following conditions: Tube voltage: 30-50 kV; Tube current: 70-100 mA; Tube type: Rh 【0055】 The content of each element can be determined as the mass percentage [mass%] of each element obtained by X-ray fluorescence analysis relative to the mass of the fiber cloth, converted to oxide form. In this case, the oxide conversion is as follows: Al = Al ２ O ３ , Si is SiO ２ That's all you need to do. 【0056】The fiber cloth of this embodiment preferably does not contain iron (Fe) (i.e., it contains 0 ppm by mass). On the other hand, iron is included in the fiber cloth of this embodiment as it is derived from the raw materials, and it is considered that it does not contribute much to the suppression of creep deformation, so it may be included. The iron content of the fiber cloth of this embodiment may be 5000 ppm by mass or less, 4700 ppm by mass or less, 3000 ppm by mass or less, 1000 ppm by mass or less, 500 ppm by mass or less, or 100 ppm by mass or less. The fiber cloth of this embodiment preferably does not contain iron (i.e., 0 ppm by mass or more), but the iron content may be 0 ppm by mass or more, greater than 0 ppm by mass, or 1 ppm by mass or more. Furthermore, the iron content of the fiber cloth of this embodiment may be greater than 0 ppm by mass and 3000 ppm by mass or less, or 1 ppm by mass or more and 500 ppm by mass or less. 【0057】 The fiber cloth of this embodiment only needs to have a size appropriate to its intended use, and its area must be 0.0009 m². ２ Above, 0.0025 m ２ or greater than or equal to 0.01 m ２ That's all, and also 10m ２ Below, 1m ２ The following or 0.25 mm ２ The following can be exemplified: 0.0009 m ２ 0.25mm or more ２ Below, 0.0025m ２ 10m or more ２ Below, 0.01m ２ 0.25m or more ２ The following are some examples: 【0058】 The average thickness of the fiber cloth in this embodiment is 0.2 mm or more or 0.4 mm or more, and can also be 1.0 mm or less or 0.6 mm or less, with examples including 0.2 mm or more and 1.0 mm or less, or 0.4 mm or more and 0.6 mm or less. 【0059】The average thickness should be measured using a general thickness gauge (for example, FS-60N, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) in accordance with JIS L1096. Specifically, the thickness of five measurement points on the fiber cloth should be measured under the following conditions, and the average value should be taken as the average thickness of the fiber cloth. For fiber cloths with a square or rectangular shape, the thickness of each measurement point should be measured by dividing the longest side into five sections and measuring the center of the resulting line segment. For fiber cloths with a circular or polygonal shape, the thickness of each measurement point should be measured by dividing the diameter of the inscribed circle into five sections and measuring the center of the resulting line segment. Pressure: 23.5 kPa Pressure holding time: 10 seconds 【0060】 The fiber diameter of the continuous fibers constituting the fiber cloth of this embodiment can be exemplified as 8 μm or more, 10 μm or more, 18 μm or less, or 15 μm or less, and is preferably 8 μm or more and 18 μm or less, or 10 μm or more and 15 μm or less. 【0061】 The fiber diameter can be determined by using a general-purpose SEM (e.g., JSM-7600F, manufactured by JEOL Ltd.) to observe the cross-section of a continuous fiber, and then performing image analysis using general-purpose image analysis software (e.g., Nanohunter, manufactured by Nanosystems). The following conditions can be used for SEM observation. For image analysis, import the cross-sectional observation diagram into the image analysis software, and use the diameter of the circle equivalent to the area of ​​the outer circumference of the continuous fiber as the fiber diameter. Acceleration voltage: 5kV Magnification: 1000x The sample to be measured should be a continuous fiber embedded in resin so that the cut surface is exposed on the surface, and then polished using a general-purpose manual polishing machine (e.g., Tegra System, manufactured by Strures) to expose the cut surface. 【0062】The single-fiber strength of continuous fibers can be exemplified as 1.0 GPa or higher, 1.6 GPa or higher, or 2.0 GPa or higher, and also 4.0 GPa or lower, or 3.0 GPa or lower. The single-fiber strength varies depending on the type of continuous fiber. For alumina continuous fibers, the single-fiber strength can be 2.0 GPa or higher, 2.5 GPa or higher, or 2.8 GPa or higher, and also 4.0 GPa or lower, with a range of 2.0 GPa to 4.0 GPa or 2.5 GPa to 3.0 GPa. Furthermore, for alumina and mullite mixed continuous fibers, the single-fiber strength can be exemplified as 1.0 GPa or higher, or 1.3 GPa or higher, and also 4.0 GPa or lower, or 3.0 GPa or lower, with a range of 1.0 GPa to 3.0 GPa. 【0063】 Examples of standard deviations for the single fiber strength of continuous fibers include values ​​of 0.1 GPa or higher, 0.2 GPa or higher, or 0.3 GPa or higher, as well as values ​​of 0.7 GPa or lower, 0.6 GPa or lower, 0.5 GPa or lower, or 0.4 GPa or lower. Such values ​​for the standard deviation of single fiber strength make it easier for the fiber cloth to exhibit uniform strength. Examples of standard deviations for single fiber strength include 0.1 GPa to 0.7 GPa, 0.2 GPa to 0.6 GPa, or 0.2 GPa to 0.4 GPa. 【0064】The fiber cloth of this embodiment is composed of fiber bundles of continuous fibers with a denier count of 10,000 denier or less, 8,000 denier or less, or 5,000 denier or less. The denier count is an indicator of the thickness of the fiber bundle, and the thicker the fiber bundle, the higher the denier count. If the fiber diameter of the continuous fibers constituting the fiber bundle is the same, the higher the denier count, the greater the number of continuous fibers constituting the fiber bundle. Since the creep rupture time of the resulting CMC tends to be longer, it is preferable that the continuous fiber cloth is composed of fiber bundles of continuous fibers with a denier count of 4,000 denier or less, 2,000 denier or less, 1,800 denier or less, 1,600 denier or less, or 1,500 denier or less. As the denier count decreases, the high-temperature creep characteristics tend to improve. Therefore, the lower limit of the denier count can be 500 denier or more, 700 denier or more, 900 denier or more, or 1000 denier or more. The range can be 500 denier or more and 10000 denier or less, 500 denier or more and 5000 denier or less, 500 denier or more and 2000 denier or less, or 700 denier or more and 1800 denier or less. 【0065】 Because the heat resistance and high-temperature creep characteristics are particularly high, the fiber cloth of this embodiment is preferably at least one of an alumina fiber cloth containing zirconium, and an alumina and mullite mixed fiber cloth containing one or more selected from the group of ytterbium, chromium, and yttrium, and more preferably an alumina and mullite mixed fiber cloth containing ytterbium. 【0066】 The fiber cloth of this embodiment can be applied to known applications of continuous fibers and can be used as a reinforcing material, and further as at least one of high-temperature components and reinforcing components. In addition, it can be used as a fiber for fiber-reinforced composite materials, including ceramic fiber-reinforced ceramics. 【0067】[Ceramic Matrix Composite Material (CMC)] The CMC of this embodiment is a ceramic material containing the fiber cloth of this embodiment, and is a composite material of the fiber cloth of this embodiment and a ceramic matrix. The CMC of this embodiment is a composite material in which the matrix is ​​strengthened by including the fiber cloth of this embodiment as a reinforcing material, and can therefore be considered as a fiber-reinforced ceramic material containing the fiber cloth of this embodiment. In the CMC of this embodiment, the fiber cloth is a member that strengthens the ceramic matrix, and the ceramic matrix (hereinafter also simply referred to as "matrix") is a member that is strengthened by the fiber cloth. The fiber cloth and the matrix are composited through an interface having appropriate strength. Due to the synergistic effect of the composite, the CMC of this embodiment exhibits higher mechanical properties, especially high mechanical properties at high temperatures, compared to the properties of the matrix alone. 【0068】 The matrix (specifically, the crystalline particles constituting the matrix) is preferably a ceramic with a different composition from the ceramics constituting the fiber cloth, and is at least one of oxide ceramics and non-oxide ceramics, preferably an oxide ceramic, more preferably one or more selected from the group of alumina, mullite, silica and zirconia, even more preferably one or more selected from the group of alumina, mullite and zirconia, even more preferably at least one of alumina and mullite, and preferably contains at least alumina. The matrix may include a plurality of ceramics with different compositions, and is preferably two or more selected from the group of alumina, mullite and zirconia, and more preferably alumina and mullite. 【0069】 The matrix can be made of any ceramic material appropriate to the purpose. For example, if high strength is required, the matrix may be alumina. If high high-temperature creep properties are required, the matrix may be at least one of alumina and mullite, or more specifically, alumina, or even more specifically, α-alumina. 【0070】The CMC of this embodiment includes a fiber cloth (doped cloth) and a matrix, or may consist of the fiber cloth and the matrix. On the other hand, the matrix constituting the CMC of this embodiment may contain additive components, and furthermore, components that have the function of suppressing the grain growth of the crystalline particles constituting the matrix during heat treatment. This makes it easier to suppress the growth of crystalline particles in the matrix during the manufacturing of the CMC of this embodiment. 【0071】 The additive component can be any compound with a different composition from the matrix, such as silica (SiO ２ ), Zirconia (ZrO ２ ), Yttria (Y ２ O ３ ), ytterbium oxide (Yb ２ O ３ ) and mullite (3Al ２ O ３ ・2SiO ２ It can be exemplified that it is one or more selected from the group of ), and it is preferable that it is one or more selected from the group of silica, zirconia, mullite, and ytterbium oxide, and more preferably one or more selected from the group of silica, zirconia, and mullite, and even more preferably at least one of silica and zirconia, and even more preferably silica and zirconia. In this embodiment, the zirconia is zirconia in which a stabilizing element is solid-solved, for example, zirconia in which yttrium is solid-solved, and furthermore Y ２ O ３ Zirconia containing yttrium in a solid solution of 2 mol% to 4 mol% (calculated equivalent) may also be used. 【0072】 The matrix constituting the CMC of this embodiment may contain one to five types of additive components, one to three types, one to two types, or one type. 【0073】 The fiber cloth (dope cloth) that constitutes the CMC in this embodiment may be any fiber cloth similar to the fiber cloth in this embodiment described above. 【0074】The fiber cloth constituting the CMC in this embodiment may be a continuous fiber cloth composed of ceramics with the same composition as the matrix or a different composition. To suppress adhesion between the fiber cloth and the ceramic matrix, it is preferable that the fiber cloth is a continuous fiber cloth with a different composition from that of the ceramic matrix. 【0075】 The CMC of this embodiment may contain fiber cloth in a manner corresponding to the desired shape, and may also contain laminated fiber cloth. The CMC of this embodiment may contain two to ten layers, or more specifically, two to six layers, of laminated fiber cloth. By laminating the fiber cloth, the CMC can be made into the desired shape without degrading its mechanical properties. 【0076】 The CMC density in this embodiment varies depending on the type of matrix and fiber cloth, but any density that exhibits the desired properties is acceptable. For example, a CMC density of 2.20 g / cm³ is used. ３ Above, 2.25g / cm ３ 2.60g / cm or more ３ That is all, and also 3.20 g / cm³ ３ Below, 3.00g / cm ３ The following or 2.90 g / cm³ ３ The following can be cited as an example: 2.20 g / cm³ ３ 3.20g / cm or more ３ Below, 2.25g / cm ３ 3.00g / cm or more ３ The following are some examples. For instance, in a CMC composed of an alumina matrix, the CMC density is 2.60 g / cm³. ３ 3.00g / cm or more ３ The following conditions result in virtually no influence of CMC density on high-temperature creep characteristics. 【0077】Examples of the fiber volume ratio of the CMC in this embodiment include 30% by volume or more, 35% by volume or more, or 40% by volume or more, as well as 60% by volume or less, 55% by volume or less, or 50% by volume or less, and examples include 30% by volume or more and 60% by volume or less, or 35% by volume or more and 55% by volume or less. When the fiber volume ratio is within these values, the shape of the CMC is more easily maintained and the strength of the CMC tends to be higher. 【0078】 In this embodiment, the mass ratio of fiber cloth to the mass of CMC (hereinafter also referred to as "fiber cloth content") is 25% by mass or more, 30% by mass or more, 38% by mass or more, or 40% by mass or more, and also less than 80% by mass, 75% by mass or less, 72% by mass or less, or 70% by mass or less. As for the fiber content, it is 25% by mass or more and less than 80% by mass, 30% by mass or more and 72% by mass or less, or 40% by mass or more and 70% by mass or less. 【0079】 In this embodiment, the mass ratio of the matrix to the mass of the CMC (hereinafter also referred to as "matrix content") is less than 75% by mass, 70% by mass or less, 65% by mass or less, or 60% by mass or less, and also includes 20% by mass or more, 28% by mass or more, 30% by mass or more, or 32% by mass or more. Examples of matrix content include 20% by mass or more and less than 75% by mass, 28% by mass or more and 65% by mass or less, or 28% by mass or more and 60% by mass or less. 【0080】 In this embodiment, the mass ratio of the additive component to the mass of the CMC (hereinafter also referred to as "additive component content") is greater than 0% by mass, 0.1% by mass or more, 0.2% by mass or more, or 0.3% by mass or more, and also includes 3.0% by mass or less, 2.5% by mass or less, 2.0% by mass or less, or 1.5% by mass or less. Examples of additive component content include greater than 0% by mass and 3.0% by mass or less, 0.1% by mass or more and less than 2.5% by mass, or 0.3% by mass or more and 2.0% by mass or less. 【0081】 Fiber cloth content (X ｆ The mass percentage can be calculated using the following formula: X ｆ = (V ｆａｖｅ ×ρ ｆ / ρ ＣＭＣ ) × 100 (2) 【0082】 In equation (2), V ｆａｖｅ is the above fiber volume fraction [vol%], ρ ｆ is the density of the fiber cloth [g / cm3], ρ ＣＭＣ is the CMC density [g / cm ３ . ρ ｆ can be measured by the Archimedes method conforming to JIS R7603. 【0083】 The additive component content X ａ [mass%] can be obtained from the following equation. X ａ = (100 - X ｆ ) × Y ａａｖｅ（１） + (100 - X ｆ ) × Y ａａｖｅ（２） + ··· + (100 - X ｆ ) × Y ａａｖｅ（ｎ） (3) 【0084】 In equation (3), X ｆ is the above fiber cloth content [mass%], Y ａａｖｅ（ｎ） is the average value of the unit additive component content Y ａ（ｎ） [mass%] obtained from the SEM observation diagram of one ceramic matrix, and n is the number of additive components with different compositions. That n is 2 or more means including a plurality of additive components with different compositions. Also, including additive components with different compositions can be confirmed by SEM-EDS measurement. 【0085】 Y ａ（ｎ） can be obtained using the following equation. 【0086】 Y ａ（ｎ） = (A ａ（ｎ） ρ ａ（ｎ） ) / (A ａ（１） ρ ａ（１） + A ａ（２） ρ ａ（２） + ··· + A ａ（ｎ） ρ ａ（ｎ） + A ０ ρ ０ ) × 100 (4) In equation (4), Y ａ（ｎ） is the unit additive component content [mass%] obtained from the SEM observation diagram of one ceramic matrix, A ａ（ｎ） is the area of the additive component [m ２],ρ ａ（ｎ） The density of the added component [g / m³] ３ ], A ０ The area of ​​the matrix [m²] ２ ],ρ ０ The density of the matrix [g / m³] ３ ] 【0087】 The observation surface in the SEM observation diagram should be the same as the observation surface used when determining the fiber volume fraction. 【0088】 A ａ（ｎ） and A ０ The SEM image can be obtained by analyzing the image using general image analysis software (e.g., ImageJ, manufactured by the National Institutes of Health). The SEM image can be measured using a general scanning electron microscope (e.g., JSM-7600F, manufactured by JEOL Ltd.) under the following conditions: Acceleration voltage: 7kV Magnification: 5000x 【0089】 Y ａａｖｅ（ｎ） [Mass %] is the Y obtained from three or more, preferably 4 ± 1, SEM observation images. ａ（ｎ） You can use the average value. 【0090】 Matrix content (X ｍ The mass percentage can be calculated using the following formula: X ｍ = 100 - (X ｆ +X ａ ) (5) 【0091】 In equation (5), X ｆ This is the fiber cloth content [mass%], X ａ This represents the content of added components [mass %]. 【0092】 Furthermore, if the matrix contains multiple ceramics with different compositions, the content of each ceramic (hereinafter also referred to as "ceramics content") is X ｍ（ｎ） [Mass %] can be calculated using the following formula: X ｍ（ｎ） = X ｍ ×Y ｍａｖｅ（ｎ） (6) Y ｍ（ｎ） = (A ｍ（ｎ） ρｍ（ｎ） ) / ( A ｍ（１） ρ ｍ（１） +A ｍ（２） ρ ｍ（２） +..+A ｍ（ｎ） ρ ｍ（ｎ） ) × 100 (7) 【0093】 In equation (7), Y ｍ（ｎ） This is the unit ceramic content [mass%] obtained from an SEM observation image of a single ceramic matrix, A ｍ（ｎ） The matrix consists of ceramics with an area [m²] ２ ],ρ ｍ（ｎ） The matrix is ​​composed of ceramics with density [g / m³] ３ ], where n is the number of ceramics with different compositions. If n is 2 or more, it means that it contains multiple ceramics with different compositions. 【0094】 A ｍ（ｎ） This is the aforementioned A ａ（ｎ） You can find it in the same way as before. 【0095】 Y ｍａｖｅ（ｎ） [Mass %] is the Y obtained from three or more, preferably 4 ± 1, SEM observation images. ｍ（ｎ） You can use the average value. 【0096】 The creep rupture time of the CMC in this embodiment is preferably 40 hours or more, 50 hours or more, 60 hours or more, 70 hours or more, 80 hours or more, or more than 100 hours, and also preferably 500 hours or less, 400 hours or less, 300 hours or less, or 120 hours or less. The creep rupture time in this embodiment can be 40 hours or more and 500 hours or less, 50 hours or more and 400 hours or less, or more than 100 hours and 120 hours or less. 【0097】 The tensile strength of the CMC in this embodiment is 140 MPa or more, 150 MPa or more, or 160 MPa or more, and can also be 300 MPa or less, 280 MPa or less, or 250 MPa or less, with examples including 140 MPa or more and 300 MPa or 150 MPa or more and 280 MPa. 【0098】In this embodiment, the ratio of the tensile strength after heat exposure treatment to the tensile strength before heat exposure treatment of the CMC (hereinafter also referred to as the "strength retention rate") is 80% or more or 85% or more. Furthermore, the tensile strength after heat exposure treatment may be higher than the tensile strength before heat exposure treatment. Examples of strength retention rates include 120% or less, 110% or less, 100% or less, or 99% or less, with 80% to 120% or 85% to 110% being examples. The strength retention rate is one indicator of heat resistance, and the higher it is, the higher the heat resistance. Specific examples of heat exposure treatment include heat treatment of the CMC in an air atmosphere at 1200°C for 1000 hours (hereinafter also referred to as the "1200°C heat exposure treatment"), and heat treatment of the CMC in an air atmosphere at 1250°C for 1000 hours (hereinafter also referred to as the "1250°C heat exposure treatment"). The ratio of the tensile strength after 1200°C heat exposure treatment to the tensile strength before heat exposure treatment (strength retention rate (1200°C)) is 80% or more or 85% or more, and can also be 120% or less, 110% or less, 100% or less, or 99% or less, with examples including 80% or more and 120% or less, or 85% or more and 110% or less. The ratio of the tensile strength after 1250°C heat exposure treatment to the tensile strength before heat exposure treatment (strength retention rate (1250°C)) is 80% or more or 85% or more, and can also be 120% or less, 110% or less, 100% or less, or 99% or less, with examples including 80% or more and 120% or less, or 85% or more and 110% or less. 【0099】 The CMC of this embodiment can be used in known applications of CMC, and can be used as a component including it, for example, at least one of a structural component and a high-temperature component, and further as a high-temperature structural component. Furthermore, the CMC of this embodiment can be used in applications where heat resistance is particularly required, and further, one or more selected from the group of heat-resistant filters, turbine components, engine components, and nuclear-related components. 【0100】[Method for Manufacturing Ceramic Continuous Fiber Cloth] The ceramic continuous fiber cloth of this embodiment can be manufactured in any way as long as it has the above-described characteristics. An example of a method for manufacturing the ceramic continuous fiber cloth of this embodiment is a manufacturing method (hereinafter also referred to as "the manufacturing method of this embodiment") which includes contacting a solution containing a metal acetylacenate complex with the ceramic continuous fiber cloth to obtain a complex-containing cloth, washing the complex-containing cloth to obtain a washed cloth, and heat-treating the washed cloth. 【0101】 The manufacturing method of this embodiment includes contacting a fibrous cloth with a solution containing a metal acetylacenate complex (hereinafter also referred to as "AcAc complex") to obtain a complex-containing cloth (hereinafter also referred to as the "contact step"). By contacting the fibrous cloth with the solution containing the AcAc complex, the AcAc complex is adsorbed onto the surface of the fibrous cloth. 【0102】 In the manufacturing method of this embodiment, the method of contacting the fiber cloth with a solution containing the AcAc complex (hereinafter also referred to as "AcAc solution") is arbitrary, and one example is impregnating the fiber cloth with the AcAc solution (hereinafter also referred to as "impregnation treatment"), and the following conditions can be used for impregnation treatment: Impregnation temperature: 0°C or higher, 15°C or higher, or 10°C or higher, and 60°C or lower, 40°C or lower, or 35°C or lower Impregnation time: 3 hours or higher, 5 hours or higher, or 6 hours or higher, and 48 hours or lower, 24 hours or lower, or 10 hours or lower 【0103】 Since the chemical adsorption reaction of the AcAc complex onto the fiber cloth is promoted and the amount of doped metal tends to increase, it is preferable to carry out the impregnation treatment while heating at a temperature below the boiling point of the solvent, and even more preferably while maintaining the temperature below the boiling point of the solvent.Specific examples of the impregnation treatment include leaving the fiber cloth standing in the AcAc solution, and it is preferable to leave the fiber cloth standing in the AcAc solution at an impregnation temperature of 10°C to 60°C and an impregnation time of 3 hours to 48 hours, and more preferably leave the fiber cloth standing in the AcAc solution at an impregnation temperature of 15°C to 40°C and an impregnation time of 6 hours to 24 hours. 【0104】 The fiber cloth used in the contact process may be any fiber cloth having the same type, composition, area, average thickness, fiber diameter, single fiber strength, etc. as the fiber cloth described in this embodiment. Furthermore, it is preferable that the fiber cloth used in the contact process is a fiber cloth that does not have organic matter on its surface, and it is more preferable that it is a fiber cloth that has undergone desizing treatment. In this embodiment, "desizing treatment" is a heat treatment of the fiber cloth under the following conditions: Desizing treatment temperature: 600°C or higher or 700°C, or 1000°C or lower or 900°C or lower Desizing treatment time: 0.5 hours or higher or 1 hour or higher, or 24 hours or lower or 10 hours or lower Desizing atmosphere: Oxidizing atmosphere, preferably air atmosphere 【0105】 The desizing process burns off organic matter from the surface of the fiber cloth, resulting in a fiber cloth free of organic matter on its surface. This makes it easier for the AcAc complex to be adsorbed onto the fiber cloth. 【0106】 The AcAc complex contained in AcAc solution has the general formula: M(AcAc)n (where M is a metal element and AcAc is C). ５ H ７ O ２ － It is a complex compound represented by (acetylacetonate anion, where n is an integer). Examples of AcAc complexes include acetylacetonate complexes containing one or more elements selected from the group consisting of rare earth elements, zirconium, chromium, and magnesium; further, acetylacetonate complexes containing one or more elements selected from the group consisting of yttrium, cerium, samarium, europium, gadolium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, zirconium, chromium, and magnesium; further, acetylacetonate complexes containing one or more elements selected from the group consisting of yttrium, ytterbium, lutetium, thulium, erbium, zirconium, and chromium; and further, acetylacetonate complexes containing one or more elements selected from the group consisting of yttrium, ytterbium, and chromium. 【0107】Specific examples of AcAc complexes include, for instance, yttrium(III) acetylacenate n hydrate (Y(CH)). ３ COCHCOCH ３ ) ３ nH ２ O), samarium(III) acetylacenate n hydrate (Sm(CH) ３ COCHCOCH ３ ) ３ nH ２ O), Europium (III) acetylacenate n hydrate (Eu(CH) ３ COCHCOCH ３ ) ３ nH ２ O), gadolinium(III) acetylacenate n hydrate (Gd(CH) ３ COCHCOCH ３ ) ３ nH ２ O), terbium(III) acetylacenate n hydrate (Tb(CH) ３ COCHCOCH ３ ) ３ nH ２ O), dysprosium(III) acetylacenate n hydrate (Dy(CH) ３ COCHCOCH ３ ) ３ nH ２ O), holmium(III) acetylacenate n hydrate (Ho(CH) ３ COCHCOCH ３ ) ３ nH ２ O), erbium(III) acetylacenate n hydrate (Er(CH) ３ COCHCOCH ３ ) ３ nH ２ O), thulium(III) acetylacenate n hydrate (Tm(CH) ３ COCHCOCH ３ ) ３ nH ２ O), Ytterbium (III) acetylacenate n hydrate (Yb(CH) ３ COCHCOCH ３ ) ３ nH ２O), Lutetium(III) acetylacenate n hydrate (Lu(CH) ３ COCHCOCH ３ ) ３ nH ２ O), zirconium (IV) acetylacetonate (Zr(CH) ３ COCHCOCH ３ ) ４ ), chromium(III) acetylacenate (Cr(CH ３ COCHCOCH ３ ) ３ ) and magnesium (II) acetylacenate n hydrate (Mg(CH ３ COCHCOCH ３ ) ２ nH ２ O) One or more selected from the group. The AcAc complex is preferably one or more selected from the group consisting of yttrium(III) acetylacenate n hydrate, ytterbium(III) acetylacenate n hydrate, lutetium(III) acetylacenate n hydrate, thulium(III) acetylacenate n hydrate, erbium(III) acetylacenate n hydrate, zirconium(IV) acetylacetonate, and chromium(III) acetylacenate; more preferably one or more selected from the group consisting of yttrium(III) acetylacenate n hydrate, ytterbium(III) acetylacenate n hydrate, and chromium(III) acetylacetonate; and even more preferably at least one of yttrium(III) acetylacenate n hydrate and ytterbium(III) acetylacetonate n hydrate. 【0108】 Furthermore, the AcAc solution preferably contains ytterbium(III) acetylacenate n hydrate, and may also contain ytterbium(III) acetylacenate n hydrate. 【0109】As the content of the AcAc complex in the AcAc solution increases, the unit content of the doped metal in the fiber cloth tends to increase. However, the content of the AcAc complex can be exemplified by its mass ratio to the mass of the AcAc solution being 0.01% by mass or more, or 0.03% by mass or more, or 6% by mass or less, or 3% by mass or less. Examples of the AcAc complex content include 0.01% by mass or more and 6% by mass or less, or 0.03% by mass or more and 3% by mass or less. 【0110】 An AcAc solution may contain an AcAc complex and a solvent. The solvent is not particularly limited as long as it does not decompose the AcAc complex and dissolves it. Examples of solvents include one or more selected from methanol, ethanol, propanol, acetone, tetrahydrofuran, benzene, water, and heavy water, and more specifically, one or more selected from methanol, ethanol, propanol, and water. Since the AcAc complex dissolves more easily in the solvent, at least one of methanol and ethanol, and more preferably ethanol, is used as the solvent. 【0111】 In an AcAc solution, it is preferable that the AcAc complex is dissolved and that it does not contain any solid AcAc complex. 【0112】 The method for producing the AcAc solution is arbitrary and includes the process of mixing the AcAc complex with a solvent to obtain a complex solution, and filtering the complex solution. Mixing is preferably done by mixing and stirring. This results in the W of the doped cloth. ＣＶ The temperature tends to be low. The following conditions can be used as examples of stirring conditions after mixing: Stirring time: 0.5 hours or more or 1 hour or more, or 5 hours or less or 3 hours or less Stirring speed: 200 rpm or more, 250 rpm or more or 300 rpm, or 600 rpm or less or 500 rpm or less 【0113】To promote the dissolution of the AcAc complex in the solvent, the stirring speed is preferably 200 rpm to 500 rpm, and more preferably 250 rpm to 500 rpm. Preferred stirring conditions include a stirring time of 0.5 hours to 3 hours and a stirring speed of 250 rpm to 500 rpm. 【0114】 To remove undissolved AcAc complex (solid AcAc complex) and impurities, it is preferable to filter the AcAc solution after stirring. This suppresses the uneven distribution of AcAc complex on the fiber cloth. 【0115】 The manufacturing method of this embodiment includes washing the complex-containing cloth to obtain a washed cloth (hereinafter also referred to as the "washing step"). By washing the complex-containing cloth, the amount of AcAc complex and impurities contained in the fiber cloth other than by chemical adsorption is reduced. Specifically, examples of AcAc complex contained in the fiber cloth other than by chemical adsorption include AcAc complex physically adsorbed between continuous fibers. By removing these, the doped metal is contained in a dispersed state in the obtained fiber cloth, and excessive aggregation of the doped metal in the subsequent firing step is suppressed, and as a result, W ＣＶ In addition to the reduction in size, it is thought that the doped metal can form reaction products between crystal grains, and even between crystal grains within the fiber. 【0116】 The washing method for the complex-containing cloth in the manufacturing method of this embodiment is arbitrary as long as it disperses the doped metal of the fiber cloth. One washing method is to mix a sufficient amount of washing solution with the complex-containing cloth. 【0117】 The washing solution can be any solution that dissolves the AcAc complex without decomposition, and can be one or more selected from methanol, ethanol, propanol, acetone, tetrahydrofuran, benzene, water, and heavy water, with one or more selected from methanol, ethanol, and water being preferred, and ethanol being more preferred. 【0118】In the washing process, when mixing a sufficient amount of washing solution and complex-containing cloth, it is preferable to stir the washing solution (hereinafter also referred to as "stirred washing"). The following conditions are suitable for stirred washing: Stirring speed: 0.5 hours or more or 1 hour or more, and 5 hours or less, or 3 hours or less Stirring speed: 200 rpm or more, or 300 rpm, and 600 rpm or less, or 500 rpm or less 【0119】 One reason why this washing method yields a complex-containing cloth different from conventional methods is that it makes it easier to remove AcAc complexes and impurities contained in the complex-containing cloth from the fiber cloth by means other than chemiadsorption, as well as the following reason. Specifically, washing by standing allows for the removal of impurities while retaining the chemiadsorbed AcAc complexes on the fiber cloth. However, it is thought that the chemiadsorption of AcAc complexes onto the complex-containing cloth occurs in different forms of adsorption. Washing by stirring is thought to remove not only AcAc complexes contained in the fiber cloth by means other than chemiadsorption, but also AcAc complexes that have been chemiadsorbed onto the fiber cloth in an unstable state. By removing the AcAc complexes that have been chemiadsorbed in an unstable state, only AcAc complexes that are coordinated in a relatively stable state remain on the complex-containing cloth after washing. As a result, after washing, the AcAc complex adsorbed onto the fiber cloth is less prone to uneven distribution of doped metals due to excessive diffusion or migration during heat treatment, resulting in a more uniform state compared to conventional methods. Furthermore, it is believed that the doped metals can be positioned even between the crystal grains inside the fibers. 【0120】In the washing process, it is preferable to wash the fiber cloths by stirring and mixing them in a laminated state. During stirring and mixing, shear stress is applied to the fiber cloths, which may cause them to bend or twist during washing. By simultaneously stirring and mixing two or more complex-containing cloths, bending and other damage during washing are less likely to occur, resulting in easier removal of AcAc complexes and other substances that have chemically adsorbed in an unstable state across the entire complex-containing cloth. It is preferable to use two or more, four or more, or ten or more complex-containing cloths, or 50 or fewer, 30 or fewer, or 15 or fewer complex-containing cloths for stirring and mixing. Furthermore, when using laminated complex-containing cloths for stirring and mixing, it is preferable to stir and mix them with a porous sheet sandwiched between the complex-containing cloths. This suppresses localized adhesion of the complex-containing cloths during stirring and mixing. Examples of porous sheets include resin-made perforated sheets with a pore diameter of 0.5 mm to 10 mm, more specifically 1 mm to 5 mm, and a pitch of 0.5 mm to 5.0 mm, and more specifically 1.0 mm to 3.0 mm. Examples of resin-made perforated sheets include one or more selected from the group consisting of polyethylene-made perforated sheets, polypropylene-made perforated sheets, and fluororesin-made perforated sheets. 【0121】 To promote the removal of the AcAc complex that has chemically adsorbed onto the complex-containing cloth in an unstable state, the washing step preferably involves repeated stirring and washing, and it is preferable to perform stirring and washing two or more times, preferably two to five times. By repeating stirring and washing, W ＣＶ The size tends to become smaller. When repeating the stirring and washing process, it is preferable to replace the washing solution and repeat the process. 【0122】 The cleaning process may involve performing the same treatment multiple times, or it may involve a combination of different cleaning treatments. For example, when using the same treatment, the number of cleaning cycles can be between two and five. 【0123】The manufacturing method of this embodiment includes heat treatment of the washing cloth (hereinafter also referred to as the "heat treatment step"). This decomposes the organic components in the AcAc complex and diffuses the doped metal into the continuous fibers. The heat treatment should be carried out under conditions that allow the thermal diffusion of the doped metal to proceed, and the following conditions are examples of heat treatment conditions: Heat treatment atmosphere: Oxidizing atmosphere or inert atmosphere, preferably air atmosphere Heat treatment temperature: 950°C or higher, 1000°C or higher, 1050°C or higher or 1100°C or higher, and 1300°C or lower, 1250°C or lower or 1200°C or lower Number of heat treatments: 1 to 5 times 【0124】 In the heat treatment process, if the heat treatment temperature is lower than 950°C, the metal elements derived from the AcAc complex are less likely to diffuse due to heat, and the doped metal is more likely to remain on the surface of the fiber cloth. On the other hand, if the heat treatment temperature exceeds 1300°C, the fiber cloth is more susceptible to thermal degradation. 【0125】 The heat treatment time can be adjusted as needed depending on the size of the fiber cloth and the characteristics of the heat treatment furnace used. However, excessively long heat treatment (e.g., more than 80 hours) may cause grain growth of crystal particles. Therefore, the heat treatment time should be 10 hours or less, or 5 hours or less, and 30 minutes or more, or 1 hour or more. Preferred heat treatment times include 30 minutes to 10 hours, or 1 hour to 5 hours. 【0126】 The manufacturing method of this embodiment may include a step prior to the heat treatment step in which the cleaning cloth is heat-treated at 500°C or higher but less than 950°C, preferably 700°C or higher but less than 950°C (hereinafter also referred to as the "preheating step"). The pretreatment time can be arbitrarily changed depending on the size of the fiber cloth and the characteristics of the heat treatment furnace used, for example, 1 hour or more but less than 5 hours. The heat treatment atmosphere is arbitrary, but an oxidizing atmosphere, preferably an air atmosphere, is used. 【0127】In the manufacturing method of this embodiment, it is preferable to have a heat treatment step after the preheating step, and it is more preferable to preheat the washing cloth to 500°C or more but less than 950°C, and then heat treat it to 950°C or more but less than 1300°C. By such stepwise heat treatment, the rapid thermal decomposition of the AcAc complex is suppressed, and the doped metal can diffuse more uniformly and efficiently into the fiber cloth. In order to promote the diffusion of the doped metal, the preheating temperature is preferably 500°C or more or 800°C or more, and also preferably less than 950°C or 930°C, and can be 800°C or more but less than 950°C, or 800°C or more but less than 930°C. The heat treatment after preheating can be performed under the same conditions as the heat treatment step described above. 【0128】 W ＡＶ To adjust the W, it is preferable to repeat the manufacturing method of this embodiment (repeating the contact step, the washing step, and the heat treatment step), and examples include repeating the manufacturing method of this embodiment two to ten times, two to five times, or three to five times. The larger the number of repetitions, the higher the W ＡＶ It tends to become larger. 【0129】 [Method for manufacturing ceramic matrix composite material (CMC)] An example of a method for manufacturing the ceramic matrix composite material of this embodiment is a manufacturing method that includes compounding the ceramic continuous fiber cloth of this embodiment with a ceramic matrix. 【0130】 The compounding method is arbitrary, but a preferred method is a method for producing CMC that includes mixing a slurry containing a ceramic matrix source (hereinafter also referred to as "raw material slurry") with the ceramic continuous fiber cloth of this embodiment to obtain a mixture, solidifying the mixture to obtain a molded body, and firing the molded body. 【0131】The manufacturing method of this embodiment includes mixing a raw material slurry with a fiber cloth to obtain a mixture (hereinafter also referred to as the "mixing step"). Any mixing method is acceptable as long as it allows the raw material slurry to be mixed with the fiber cloth, but a method of impregnating the fiber cloth with the raw material slurry is preferred. Specific impregnation methods include at least one of vacuum impregnation and pressure impregnation, and more specifically, vacuum impregnation. 【0132】 Vacuum impregnation is a process in which a raw material slurry is impregnated into a fiber cloth in a reduced-pressure atmosphere, and the following conditions are used for the process: Impregnation atmosphere: Vacuum of 85% or more or 90% or more, and vacuum of 100% or less, vacuum of less than 100%, or vacuum of 99% or less Impregnation temperature: 0°C or more, or 10°C or more, and 40°C or less, or 35°C or less 【0133】 Pressure impregnation is a process in which a raw material slurry is impregnated into a fiber cloth under a pressurized atmosphere, and the following conditions are used for the process: Impregnation pressure: 0.11 MPa or higher or 0.15 MPa or higher, and 2.0 MPa or lower, or 1.8 MPa or lower Impregnation temperature: 0°C or higher, or 10°C or higher, and 40°C or lower, or 35°C or lower 【0134】 Preferred mixing methods include impregnating the fiber cloth into the raw material slurry at room temperature under a vacuum of 90% or higher, and further, impregnating the fiber cloth into the raw material slurry at 25±5°C under a vacuum of 95% to less than 100%. 【0135】 To produce CMC with the desired thickness, fiber cloth may be mixed into the raw material slurry in a laminated state. The laminated state may consist of two or more, five or more, or ten or more layers of fiber cloth. When two or more layers of fiber cloth are included (laminated fiber cloth), a preferred mixing method is to laminate the fiber cloth and impregnate it into the raw material slurry at room temperature under a vacuum of 90% or higher. Furthermore, an example is to laminate the fiber cloth and impregnate it into the raw material slurry at 25±5℃ under a vacuum of 95% or higher but less than 100%. 【0136】 The raw material slurry contains a ceramic matrix source (hereinafter also referred to as the "matrix source"), preferably a matrix source and an additive source, and more preferably a matrix source, an additive source and a solvent. 【0137】 The matrix source may be the target matrix or its precursor, preferably one or more selected from the group consisting of alumina, mullite, silica, and zirconia, more preferably one or more selected from the group consisting of alumina, mullite, and zirconia, even more preferably at least one of α-alumina and mullite, and even more preferably α-alumina. 【0138】 The matrix source may consist of two or more elements selected from the group consisting of alumina, mullite, and zirconia, with alumina and mullite being preferred. 【0139】 The matrix source may contain the raw materials for the target matrix and may be in any state in which it is dispersed in the raw material slurry, and is preferably at least one of powder and colloidal particles, and more preferably powder. Specific examples of the matrix source include one or more selected from the group consisting of alumina powder, mullite powder, silica powder and zirconia powder, preferably one or more selected from the group consisting of alumina powder, mullite powder and zirconia powder, more preferably at least one of α-alumina powder and mullite powder, and even more preferably α-alumina powder. 【0140】 The average particle size of the matrix source is 0.01 μm or larger, or 0.1 μm or larger, and 5 μm or smaller, or 3 μm or smaller, with examples including 0.01 μm to 5 μm or 0.1 μm to 3 μm. When the average particle size is within this range, the matrix source can be more uniformly dispersed even into the fine details of the fiber cloth. 【0141】 The BET specific surface area of ​​the matrix source is 0.5 m². ２ / g or more, 1m ２ / g or more, 5m ２ / g or more or 8m ２ / g or more, and 50m２ / g or less, 45m ２ / g or less, 40m ２ / g or less, 30m ２ / g or less or 20m ２ One example is that it is less than or equal to 0.5 m ２ / g or more 50m ２ / g or less, 5m ２ / g or more 40m ２ / g or less or 5m ２ / g or more 30m ２ Examples include values ​​of less than or equal to / g. When the BET specific surface area satisfies this range, the matrix source can be more uniformly dispersed even in the fine details of the fiber cloth. 【0142】 The raw material slurry may contain additive components, and it is preferable that it does. This promotes the solidification of the mixture or improves the uniformity of the resulting molded product. 【0143】 The additive source can be any compound with a different composition from the matrix source, and examples include compounds containing one or more elements selected from the group consisting of silicon (Si), aluminum (Al), zirconium (Zr), yttrium (Y), and ytterbium (Yb). The compound can be any one or more elements selected from the group consisting of oxides, hydroxides, and chlorides, and is preferably an oxide. 【0144】 Preferred additive sources include oxides containing one or more elements selected from the group consisting of silicon, aluminum, zirconium, yttrium, and ytterbium. Specific additive sources include silica (SiO₂ ２ ), Zirconia (ZrO ２ ), Yttria (Y ２ O ３ ), ytterbium oxide (Yb ２ O ３ ) and mullite (3Al ２ O ３ ・2SiO ２ Examples include one or more selected from the group of ), one or more selected from the group of silica, zirconia, yttria, and ytterbium oxide, and more preferably at least one of silica and zirconia, and even more preferably silica and zirconia. 【0145】 The additive source is preferably at least one of powder and colloidal particles, and more preferably a powder. Specific examples of additive sources include one or more selected from the group consisting of silica powder, zirconia powder, yttria powder, ytterbium oxide powder, and mullite powder, and more preferably one or more selected from the group consisting of silica powder, zirconia powder, yttria powder, and ytterbium oxide powder, and more preferably at least one of silica powder and zirconia powder, and even more preferably silica powder and zirconia powder. 【0146】 The average particle size of the added component source is 0.01 μm or larger, 0.04 μm or larger, or 0.1 μm or larger, and also 10 μm or smaller, 8 μm or smaller, or 6 μm or smaller, with examples including 0.01 μm or larger and 10 μm or smaller, or 0.04 μm or larger and 6 μm or smaller. When the average particle size satisfies this range, the added component source is less likely to aggregate in the raw material slurry, and the added component is more likely to be uniformly dispersed and included in the matrix of the resulting CMC. 【0147】 The BET specific surface area of ​​the added component source is 0.5 m². ２ / g or more, 1m ２ / g or more, 5m ２ / g or more or 8m ２ / g or more, and 50m ２ / g or less, 45m ２ / g or less, 40m ２ / g or less, 30m ２ / g or less or 20m ２ One example is that it is less than or equal to 0.5 m ２ / g or more 50m ２ / g or less, 5m ２ / g or more 40m ２ / g or less or 5m ２ / g or more 30m ２ Examples include values ​​of less than / g. When the BET specific surface area satisfies this range, the additive source is less likely to aggregate in the raw material slurry, and the additive component is more likely to be uniformly dispersed and contained in the matrix of the resulting CMC. 【0148】The raw material slurry may contain one to five types, one to three types, one to two types, or one type of additive ingredient source. 【0149】 The raw material slurry has a ratio of the mass of the additive component source, converted to oxides, to the mass of the metal element and metalloid element, converted to oxides (hereinafter also referred to as "amount of additive component source") of 0% by mass or more, 0.2% by mass or more, 0.5% by mass or more, or 1.0% by mass or more. Examples include 5.0% by mass or less, 4.5% by mass or less, or 3.0% by mass or less, and also 0% by mass or more to 4.0% by mass or less, or 0.5% by mass or more to 4.5% by mass or less. 【0150】 In the case of a raw material slurry where the additive source is silica and zirconia and the matrix source is alumina, the amount of additive source can be calculated from {(mass of silica [g] + mass of zirconia [g]) / (mass of silica + mass of zirconia [g] + mass of alumina) [g]} × 100. 【0151】 The solvent contained in the raw material slurry can be any solvent in which the matrix source and the additive source are dispersed, including water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, butyl alcohol, isobutyl alcohol, acetone, methyl ethyl ketone, methyl isobutyl ketone, diisobutyl ketone, cyclohexanone, diacetone alcohol, benzene, toluene, xylene, ethyl acetate, methyl acetate, butyl acetate, methoxybutyl acetate, isobutyl acetate, n-hexane, heptane, cyclohexane, methylcyclohexane, ethylene glycol, ethylene Examples include one or more selected from the group consisting of glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, N,N-dimethylformamide, tetrahydrofuran, N-methyl-2-pyrrolidone, 1,4-dioxane, and styrene. Preferably, one or more selected from the group consisting of water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, butyl alcohol, and isobutyl alcohol are used, with at least one of water and ethanol being more preferred, and water being even more preferred. 【0152】 The raw material slurry may contain a dispersant in order to uniformly disperse the matrix source and the additive component source with the solvent. Examples of dispersants include at least one of the following: a dispersant with high affinity for the matrix source and a dispersant with high solubility in the solvent. These include one or more selected from the group consisting of anionic polymer dispersants, cationic polymer dispersants, nonionic polymer dispersants, anionic low molecular weight dispersants, cationic low molecular weight dispersants, nonionic low molecular weight dispersants, inorganic acids, and inorganic salts. Specific dispersants are preferably one or more selected from the group consisting of ammonium polyacrylate, polyammonium methacrylate, sodium polyacrylate, polysodium methacrylate, polyethyleneimine, polyethylene glycol, sodium dodecyl sulfonate, sodium dodecylbenzenesulfonate, benzalkonium chloride, distearyldimethylammonium chloride, polyoxyethylene alkyl ether, pentaethylene glycol monododecyl ether, octaethylene glycol monododecyl ether, polyoxyethylene alkylphenyl ether, dilute nitric acid, dilute hydrochloric acid, dilute sulfuric acid, phosphoric acid, and sodium tripolyphosphate; more preferably one or more selected from the group consisting of ammonium polyacrylate, polyammonium methacrylate, sodium polyacrylate, polysodium methacrylate, polyethyleneimine, dilute nitric acid, dilute hydrochloric acid, dilute sulfuric acid, and phosphoric acid; even more preferably one or more selected from the group consisting of ammonium polyacrylate, polyammonium methacrylate, dilute nitric acid, and dilute hydrochloric acid; and even more preferably at least one of dilute nitric acid and dilute hydrochloric acid. 【0153】 The dispersant content is the mass of the dispersant relative to the total mass of the metal elements and metalloid elements (calculated as oxides) in the raw material slurry, the solvent, and the dispersant, and can be exemplified as being 0.01% by mass or more, 0.05% by mass or more, or 10% by mass or less, or 8% by mass or less. 【0154】Examples of solid content concentrations in raw material slurry include 30% by mass or more, 40% by mass or more, and 90% by mass or less, or 85% by mass or less. The solid content concentration of the raw material slurry is the ratio [mass%] of the mass of metal elements and metalloid elements in the raw material slurry, converted to oxides, to the mass of the raw material slurry. For example, in the case of a raw material slurry where the matrix source is alumina, the additive source is silica and zirconia, and the solvent is water, the solid content concentration can be calculated from {(mass of silica [g] + mass of zirconia [g] + mass of alumina [g]) / (mass of silica + mass of zirconia [g] + mass of alumina + mass of water) [g]} × 100. The solid content concentration can also be calculated as the ratio of the mass of the residue remaining after drying the solvent in the raw material slurry to the mass of the raw material slurry. 【0155】 The method for producing the raw material slurry is arbitrary as long as it involves mixing the matrix source and the solvent, and further, the matrix source, the additive source and the solvent, but grinding and mixing is preferred. An example of a specific method for producing the raw material slurry is mixing the matrix source, the additive source and the solvent and then grinding them in a ball mill. The grinding medium used in the ball mill should be one that can remove the slow aggregation of the matrix source and the additive source, and should be a Ceramax ball whose average particle size is larger than the average particle size of the matrix source, etc. Examples of such a grinding medium include ceramic balls with a diameter of 0.5 mm to 20 mm, and further, 1 mm to 15 mm. Examples of ceramic balls include at least one of alumina balls and zirconia balls. In order to prevent the inclusion of impurities during grinding and mixing, alumina balls are preferred as the grinding medium. 【0156】 The mixing time can be arbitrarily adjusted according to the required amount of ceramic slurry and the desired particle size; for example, a mixing time of 12 hours to 72 hours is possible. The average particle size tends to decrease as the mixing time increases until equilibrium is reached. 【0157】The fiber cloth to be used in the mixing process may be any fiber cloth according to this embodiment, and examples include a fiber cloth containing a doped metal, wherein the average unit content of the doped metal is 10 ppm by mass or more and 1,000 ppm by mass or less, and the coefficient of variation of the unit content of the doped metal is less than 0.48; and at least one of an alumina fiber cloth containing a doped metal, wherein the average unit content of the doped metal is 10 ppm by mass or more and 1,000 ppm by mass or less, and the coefficient of variation of the unit content of the doped metal is less than 0.48; and an alumina and mullite mixed fiber cloth. 【0158】 The manufacturing method of this embodiment includes obtaining a molded body by solidifying the mixture (hereinafter also referred to as the "molding step"). This provides a molded body that serves as a precursor to the CMC of this embodiment. The solidification method can be any method that gives the mixture a certain shape, and examples include one or more selected from the group of heat treatment, freezing treatment and additive treatment, with heat treatment being preferred. The molding step may be a combination of different solidification methods, or it may be a repetition of the same solidification method. 【0159】 The following conditions may be used for heat treatment: Heat treatment temperature: 50°C or higher, 60°C or higher, or 80°C or higher, and 160°C or lower, 140°C or lower, or 120°C or lower Number of heat treatments: 1 to 5 times 【0160】 The heat treatment time can be adjusted as needed depending on the amount of mixture to be solidified and the heat treatment temperature, but examples include 1 hour to 10 hours, and even 2 hours to 8 hours. 【0161】 Freezing treatment can be performed under the following conditions: Freezing temperature: -200°C or higher or -180°C or higher, and -20°C or lower or -30°C or lower Sublimation pressure: 0.001 MPa or higher or 0.002 MPa or higher, and 0.05 MPa or lower or 0.03 MPa or lower Number of treatments: 1 to 5 times 【0162】 When performing the freezing process multiple times, the freezing temperature and sublimation pressure can be set to any desired conditions. 【0163】 As an additive treatment, one method is to mix additive components such as solidifying agents and binders with the mixture to form the mixture. The additive components can be any known substances that can be used in the production of CMC, such as agar, gelatin, methylcellulose, camphene, sodium alginate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, acrylic acid, methacrylic acid, acrylamide, N,N'-methylenebisacrylamide, N,N'-ethylenebisacrylamide methacrylamide, 2,2'-azobis[N-(2-carboxyethyl)-2-methylpropionamidine] tetrahydrate, polyethylene glycol diacrylate, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, urea, boron nitride (BN), aluminum nitride (AlN), silicon nitride (Si ３ N ４ ), gallium nitride (GaN), zirconium nitride (ZrN), polyaluminum chloride ([Al ２ (OH) ｎ Cl ６－ｎ ] ｍ (1 ≤ n ≤ 5, m ≤ 10), trimethoxyaluminum, triethoxyaluminum, tri-n-propoxyaluminum, tri-i-propoxyaluminum, tri-n-butoxyaluminum, tri-i-butoxyaluminum, tri-sec-butoxyaluminum, tri-t-butoxyaluminum, trimethoxyborone, triethoxyborone, tri-n-propoxyborone, tri-i-propoxyborone, tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane Examples include one or more selected from the group consisting of tetra-i-propoxysilane, tetra-n-butoxysilane, tetra-i-butoxysilane, tetra-n-butoxysilane, tetra-sec-butoxysilane, tetra-t-butoxysilane, methyltrimethoxysilane, ethyltrimethoxysilane, propyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, paraffin wax, and polyvinyl alcohol. 【0164】 The additive treatment is preferably one or more methods selected from the group consisting of mixing a solidifying agent and a binder with the mixture, mixing a solidifying agent with the mixture, and mixing a binder with the mixture, with the method of mixing a solidifying agent and a binder with the mixture being more preferable. 【0165】 In the method for manufacturing CMC of this embodiment, the molded body may be calcined to obtain a calcined body prior to firing (hereinafter also referred to as the "calcination step"). This causes the particles constituting the matrix source to neck together, making it easier to suppress shape changes during the subsequent firing. 【0166】 In the calcination process, the molded body is calcined to obtain a calcined body. The calcination conditions should be such that necking between the matrix source particles proceeds, and the following conditions are examples: Calcination atmosphere: Oxidizing atmosphere or inert atmosphere, preferably air atmosphere Calcination temperature: 800°C or higher or 850°C or higher, and less than 1000°C or 900°C or lower 【0167】 The calcination time can be arbitrarily changed depending on the size of the molded body and the characteristics of the calcination furnace used, for example, between 30 minutes and 120 hours. 【0168】 In the manufacturing method of this embodiment, the calcined body may also be subjected to the mixing step. The mixing step may be carried out under the same conditions as described above, except that the calcined body is used instead of fiber cloth. The calcined body after mixing with the raw material slurry may be calcined by any method. 【0169】 If the method for manufacturing CMC in this embodiment includes a calcination step, the calcined body may be subjected to firing instead of the molded body. 【0170】The manufacturing method of this embodiment includes firing the molded body (hereinafter also referred to as the "firing step"). This yields the CMC of this embodiment. If the manufacturing method of this embodiment includes a calcination step, a calcined body may be used instead of the molded body for firing. By firing, the particles constituting the matrix source are sintered as crystalline particles with grain boundaries. The firing conditions should be such that the sintering of the matrix source progresses, and the following conditions can be cited as firing conditions: Firing atmosphere: Oxidizing atmosphere or inert atmosphere, preferably air atmosphere Firing temperature: 1000°C or higher, 1100°C or higher or 1200°C or higher, and 1500°C or lower, 1450°C or lower or 1400°C or lower Number of firings: 1 to 5 times 【0171】 The firing time can be arbitrarily changed depending on the size of the molded body (or calcined body) and the characteristics of the firing furnace used, for example, from 30 minutes to 120 hours. When firing is performed multiple times, the firing atmosphere and firing temperature can be set to any conditions. The fiber cloth in this embodiment is heat-treated at 950°C or higher, and even 1000°C or higher. Therefore, even when subjected to the firing process, the diffusion of the doped metal contained in the fiber cloth into the matrix is ​​suppressed. As a result, a CMC containing the fiber cloth as a reinforcing material is obtained while the dispersion state of the doped metal in the fiber cloth is maintained. 【0172】 For ease of operation, atmospheric pressure firing is preferred. In this embodiment, "atmospheric pressure firing" refers to firing by heating the object to be fired (such as a molded body or calcined body) without applying any external force during firing. 【0173】The present disclosure will be described below with reference to examples. However, the present disclosure is not limited to these examples. (Average particle size) The average particle size was measured under the following conditions by a method in accordance with JIS R 1629. The measurement was performed using a laser diffraction / scattering particle size distribution analyzer (device name: MT3300EX-II, manufactured by Microtrac Bell). Light source: Semiconductor laser Voltage: 780mW Refractive index of alumina: 1.77 Refractive index of zirconia: 2.17 Refractive index of silica: 1.48 Refractive index of solvent (water): 1.33 Calculation mode: MT3000EXII 【0174】 (BET specific surface area) The BET specific surface area was measured using the BET single-point method with a carrier gas method using nitrogen as the adsorption gas, in accordance with JIS Z 8830, under the following conditions. The measurement was performed using a gas adsorption amount measuring device (device name: BELSORP MR6, manufactured by MICROTRAC). Adsorption medium: N ２ Adsorption temperature: -196°C Pretreatment conditions: Air atmosphere, treatment at 200°C for 25 minutes 【0175】 (Unit Content of Doped Metals) The unit content was determined as the mass percentage [mass ppm] of doped metals contained in 1 g of fiber cloth measured by ICP emission spectrometry. ICP emission spectrometry was performed using an ICP emission spectrometer (instrument name: 5800 ICP-OES, manufactured by Agient Technologies) under the following conditions: Frequency: 27 MHz Output: 1.2 kW Detector: CCD detector Sample introduction: Cyclone nebulizer A fiber cloth measuring 20 mm wide x 20 mm long was used for the unit content measurement. Prior to ICP emission spectrometry, the sample was subjected to pressurized sulfuric acid decomposition under the following conditions: Heating temperature: 250 °C ± 50 °C Heating time: 100 hours ± 50 hours 【0176】 (Average value of the unit content of doped metal; W) ＡＶ ) W ＡＶThe average unit content [mass ppm] was calculated. In measuring the average unit content, the measurement sample was a rectangular fiber cloth measuring 110 mm wide x 240 mm long, which was divided into three sections vertically and horizontally. Of the nine resulting cut pieces, five pieces were selected: one containing the center of gravity and four containing the four corners. The measurement sample used five measurement pieces obtained by cutting each cut piece to a size of 20 mm wide x 20 mm long, including its center of gravity. 【0177】 (Standard deviation of unit content of doped metal; W) ＳＤ ) W ＳＤ This was calculated as the standard deviation of the unit content [mass ppm]. W ＳＤ In the measurement, the sample to be measured is the above W ＡＶ It was obtained in the same manner. 【0178】 (Coefficient of variation of the unit content of doped metal; W) ＣＶ ) W ＣＶ is, W ＳＤ W ＡＶ The value was calculated by dividing by . (STEM-EDS measurement and distribution of characteristic X-ray spectral intensity of each element) STEM-EDS measurements were performed using a transmission electron microscope (instrument name: JEM-2100F, manufactured by JEOL Ltd.) and an energy-dispersive X-ray spectrometer (instrument name: JED-2300T, manufactured by JEOL Ltd.). The STEM observation conditions were as follows: Acceleration voltage: 200 kV Observation magnification: 2,000,000 times For the measurement sample, a fiber cloth was carbon-deposited and then thinned with a focused ion beam, and its cross-section was observed using STEM. The distribution of characteristic X-ray spectral intensity of each element was determined by measuring the characteristic X-ray spectral intensity of each element every 1.54 nm along line segments passing through crystal grains and their grain boundaries, as shown by the solid lines in Figure 3. 【0179】(Average Thickness) The average thickness of the fiber cloth was measured using a thickness gauge (device name: FS-60N, manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) in accordance with JIS L1096. The thickness of the fiber cloth was measured at five points under the following conditions, and the average value was taken as the average thickness of the fiber cloth. For each measurement point, the longest side was divided into five sections, and the center of the resulting line segment was measured. Pressure: 23.5 kPa Pressure holding time: 10 seconds 【0180】 (Fiber diameter) The fiber diameter can be determined by observing the cross-section of a continuous fiber with a SEM (Scanning Electron Microscope) (device name: JSM-7600F, manufactured by JEOL Ltd.), obtaining a cross-sectional view, and then performing image analysis using image analysis software (software name: Nanohunter, manufactured by Nanosystems). The following measurement conditions were used: Acceleration voltage: 5kV Magnification: 1000x Prior to measurement, the measurement sample was prepared by cutting the continuous fiber, embedding it in resin so that the cut surface was exposed, and then polishing it using a manual polishing machine (device name: Tegra System, manufactured by Strures). In the image analysis, the cross-sectional view was imported into the image analysis software, and the diameter of the circle equivalent to the area of ​​the outer circumference of the continuous fiber was defined as the fiber diameter. 【0181】 (Single Fiber Strength) Single fiber strength was measured according to the method in accordance with JIS R 1657. The measurement was performed using a strength testing machine (device name: AG-XPlus, manufactured by Shimadzu Corporation) and a tensile testing fixture, with a loading speed of 0.5 mm / min and 30 measurements, and the average value was taken as the single fiber strength. The measurement sample was obtained by extracting the continuous ceramic fibers constituting the fiber cloth from a single fiber cloth and processing them to a length of 50 mm. 【0182】 (Fiber volume ratio) Fiber volume ratio (V ｆａｖｅ ) [Volume %] is the unit fiber volume fraction (V) obtained by equation (1). ｆ ) Calculated as the average value of [volume %]. V ｆ = A ｆ / (A ｆ +A ｍ ) × 100 (1) In equation (1), V ｆ is the unit fiber volume fraction [volume %], Aｆ The area of ​​the fiber cloth [m²] ２ ], A ｍ The area of ​​the ceramic matrix [m²] ２ ]. A ｍ and A ｆ The SEM observation image was obtained by binarizing the image using image analysis software (software name: ImageJ, manufactured by the National Institutes of Health, USA). The SEM observation image was obtained using a scanning electron microscope (instrument name: JSM-7600F, manufactured by JEOL Ltd.) under the following conditions: Acceleration voltage: 5kV Observation magnification: 130x SEM observation was performed on the cross-section of CMC cut into a plate shape with a width of 8±1mm × length of 6±1mm, with the cross-section serving as the observation surface. Fiber volume fraction (V ｆａｖｅ ) [Volume %] is the volume fraction of 12 units of fiber (V ｆ ) This was calculated as the average value of [volume %]. 【0183】 (CMC density) The measured density is calculated using an electronic balance as the mass [g / cm³] relative to the volume measured by the Archimedes method, in accordance with JIS R 1634. ３ The results were obtained from the following. Prior to measurement, the mass of the dried CMC was measured, then the CMC was placed in water, boiled for 3 hours, and left to stand at room temperature for 6 hours or more as a pretreatment. 【0184】 (Fiber cloth content) Fiber cloth content (X ｆ The mass percentage was calculated from equation (2) above. 【0185】 (Additional component content) Additive component content X ａ [Mass %] was obtained from equations (3) and (4) above. The observation surface in SEM observation was the same as the observation surface used when determining the fiber volume fraction. A in equation (4) ａ（ｎ） and A ０ The SEM observation images were obtained by image analysis using image analysis software (software name: ImageJ, manufactured by the National Institutes of Health, USA). The SEM observation images were measured using a scanning electron microscope (device name: JSM-7600F, manufactured by JEOL Ltd.) under the following conditions: Acceleration voltage: 7kV Magnification: 5000x Y ａａｖｅ（ｎ）[Mass %] represents the content of three units of additive Y. ａ（ｎ） It was calculated as the average value. 【0186】 (Matrix content) Matrix content (X ｍ The mass percentage was calculated from equations (5) to (7) above. 【0187】 (Tensile Strength) The tensile strength of CMC was measured according to the ASTM C1275 standard. The measurement was performed using a strength testing machine (device name: MTS Criterion, manufactured by MTS) and a tensile testing fixture, with a loading speed of 0.5 mm / min and two measurements. The average value was used as the tensile strength of CMC. Prior to the measurement, as described above, the plate-shaped CMC was processed into a dogbone shape as shown in Figure 2, and aluminum tabs were attached to both ends of the CMC to create the test specimen. The width and thickness of the test specimen were measured with a micrometer, and the length of the test specimen was measured with calipers. 【0188】 (Creep rupture time) The creep rupture time of CMC was measured according to the ASTM C1337 method. The measurement was performed twice, and the average value was calculated. The measurement was performed using a mechanical properties testing machine (device name: MTS Landmark, manufactured by MTS Corporation) under the following conditions: Heating rate: 35°C / min Applied stress: 100 MPa Stress rate: 15 MPa / second Maximum measurement time: 100 hours For CMC containing alumina and mullite mixed fiber cloth, the measurement was performed at a temperature of 1200°C, and for CMC containing alumina fiber cloth, the measurement was performed at 1000°C. The same CMC samples used for the tensile test were used for the creep rupture time measurement. 【0189】[Preparation of continuous ceramic fiber cloth (dope cloth)] Example 1 4.7 g of ytterbium(III) acetylacetonate hydrate (product name: Ytterbium(III) Acetylacetonate Hydrate, manufactured by Stream Chemicals Inc.) and 1578 g of ethanol were mixed. After mixing, the mixture was stirred at a stirring speed of 300 rpm for 1 hour to obtain an ethanol solution in which the mass concentration of ytterbium(III) acetylacetonate was 0.3% by mass. The obtained ethanol solution was filtered to obtain an impregnation solution. 【0190】 A mixed fiber cloth made of alumina and mullite, with a denier count of 1500 denier (product name: Nextel Ceramics Cloth 720 EF-11, manufactured by 3M). ２ O ３ The fiber cloth (content: 85% by mass, fiber diameter: 13 μm) was cut to a width of 110 mm x length of 240 mm and then treated (desized) at 800°C in an air atmosphere. XRD measurement and X-ray fluorescence analysis revealed that the fiber cloth contains α-alumina and mullite, and also Al ２ O ３ It was confirmed that the fiber cloth had an equivalent Al content of 85% by mass. 【0191】 The mixed fiber cloth, after desizing, was left to stand in an impregnation solution at room temperature for 6 hours to obtain a complex-containing cloth (impregnation step). The complex-containing cloth removed from the impregnation solution was mixed with 1587 g of ethanol and washed by stirring at a stirring speed of 300 rpm for 30 minutes (washing step). The stirring was performed with 25 layers of fluororesin (PTFE) perforated sheets with a pore diameter of 2 mm and a pitch of 3.2 mm, alternately layered with the complex-containing cloth. After stirring, the ethanol was replaced with the same amount of fresh ethanol, and the stirring was performed again in the same manner, for a total of two stirrings to obtain a washed cloth. 【0192】The cleaning cloth was preheated by heat treatment at 900°C for 2 hours in an air atmosphere (preheating step), and then heat treatment was performed at 1100°C for 2 hours in an air atmosphere (heat treatment step) to obtain the ytterbium-containing alumina and mullite mixed fiber cloth (doped cloth) of this embodiment. 【0193】 Example 2 The ytterbium-containing alumina and mullite mixed fiber cloth of this example was obtained in the same manner as in Example 1, except that 0.48 g of ytterbium(III) acetylacetonate hydrate was used and the standing time in the impregnation solution was 24 hours. 【0194】 Example 3 The chromium-containing alumina and mullite mixed fiber cloth of this example was obtained in the same manner as in Example 1, except that 3.5 g of chromium(III) acetylacetonate (product name: Chromium(III)Acetylacetonate, manufactured by Strem Chemicals, Inc.) was used instead of ytterbium(III) acetylacetonate hydrate. 【0195】 Example 4 The ytterbium-containing alumina and mullite mixed fiber cloth of this example was obtained in the same manner as in Example 1, except that 3.9 g of yttrium(III) acetylacetonate hydrate (product name: Yttrium(III)Acetylacetonate Hydrate, manufactured by Stream Chemicals, Inc.) was used instead of ytterbium(III) acetylacetonate hydrate. 【0196】 Example 5 As a fiber cloth, a mixed fiber cloth consisting of alumina and mullite, with a denier count of 3000 denier (product name: Nextel Ceramics Cloth 720 EF-19, manufactured by 3M). ２ O ３ The ytterbium-containing alumina and mullite mixed fiber cloth of this example was obtained in the same manner as in Example 1, except that a ytterbium-containing alumina and mullite (containing 85% by mass, with a fiber diameter of 13 μm) was used. 【0197】Example 6 As a fiber cloth, a mixed fiber cloth consisting of alumina and mullite, with a denier count of 4500 denier (product name: Nextel Ceramics Cloth 720 EF-13, manufactured by 3M). ２ O ３ The ytterbium-containing alumina and mullite mixed fiber cloth of this example was obtained in the same manner as in Example 1, except that a ytterbium-containing alumina and mullite (content: 85% by mass, fiber diameter: 13 μm) was used and the standing time in the impregnation solution was 24 hours. 【0198】 Comparative Example 1: The ytterbium-containing alumina and mullite mixed fiber cloth of this comparative example was obtained in the same manner as in Example 1, except that the complex-containing cloth was not mixed with ethanol after standing. 【0199】 Comparative Example 2: The ytterbium-containing alumina and mullite mixed fiber cloth of this comparative example was obtained in the same manner as in Example 5, except that the complex-containing cloth, after being left to stand in the impregnation solution, was not stirred and mixed with ethanol. 【0200】 Comparative Example 3: A ytterbium-containing fiber cloth was prepared by a method similar to Example A8 of International Publication No. 2022 / 071218. Specifically, 4.7 g of ytterbium(III) acetylacetonate hydrate was mixed with ethanol, and the mixture was stirred at a stirring speed of 300 rpm for 1 hour to obtain an ethanol solution in which the mass concentration of ytterbium(III) acetylacetonate was 0.3% by mass. This ethanol solution was used as an impregnation solution without filtration. 【0201】 The ytterbium-containing alumina and mullite mixed fiber cloth of this comparative example was obtained in the same manner as in Example 5, except that the impregnation solution obtained was used and the complex-containing cloth and ethanol were not stirred and mixed after standing. 【0202】 Comparative Example 4: The ytterbium-containing alumina and mullite mixed fiber cloth of this comparative example was obtained in the same manner as in Example 5, except that the ytterbium(III) acetylacetonate hydrate was not stirred after mixing with ethanol, the ethanol solution was not filtered, and the complex-containing cloth and ethanol were not stirred and mixed after standing. 【0203】 【0204】 The results are shown in the table below. 【0205】 【0206】 The fiber cloths in the examples all contain doped metal, W ＡＶ The amount is 10 ppm by mass or more and 80 ppm by mass or less, and also W ＣＶ The ratio is 0.20 or less, confirming that the doped metal is uniformly present, whereas the comparative example's fiber cloth contains doped metal, W ＣＶ The values ​​were 0.48 or higher, and even 0.50 or higher, confirming that the uniformity of the doped metal was low. 【0207】 By comparing Examples 1 and 5 with Comparative Examples 1 and 2, it can be confirmed that even a smaller amount of doped metal can be uniformly incorporated into the fiber cloth by going through the washing process. 【0208】 Examples 1, 3 and 4 show that regardless of the type of doped metal, W ＡＶ and W ＣＶ It was confirmed that a fiber cloth satisfying the requirements could be obtained. Furthermore, from Examples 1, 5, and 6, it was confirmed that the doped metal tends to become more uniform when the denier count is increased. 【0209】 Furthermore, the fiber cloth of Comparative Example 3 obtained by a known manufacturing method is W ＣＶ It was confirmed that the doping was large and the uniformity of the doped metal was low. 【0210】 Figure 3 shows a STEM observation image of the ytterbium-containing alumina and mullite mixed fiber cloth of Example 5, and Figure 4 shows the EDS analysis results from point A to point C in Figure 3. From Figure 4, it can be seen that the characteristic X-ray spectral intensities of ytterbium and silicon are high at the grain boundaries (point B) of the crystal grains, confirming that these elements are abundant at the grain boundaries. 【0211】 From a comparison of Example 5 and Comparative Example 3, it can be seen that by going through filtration and washing, W ＡＶ , W ＳＤ and W ＣＶIt was confirmed that all of these decreased, resulting in a more uniform distribution of the doped metal. Furthermore, from a comparison of Comparative Examples 3 and 4, it was found that stirring after mixing the ethanol solution resulted in W ＳＤ and W ＣＶ It was confirmed that the size decreased. Comparing Example 5 and Comparative Example 2, it was found that after washing, W ＡＶ , W ＳＤ and W ＣＶ All of these parameters were reduced, confirming that the doped metal was distributed more uniformly. 【0212】 Furthermore, a comparison between the example and the comparative example revealed that the standard deviation of the single fiber strength of the fiber cloth in the example was 0.35 GPa or less, and even 0.30 GPa or less, while the standard deviation of the single fiber strength of the fiber cloth in the comparative example was 0.50 GPa or more. This indicates that the example had higher single fiber strength of the continuous fibers constituting the fiber cloth, and the standard deviation of the single fiber strength of those continuous fibers was smaller. Thus, it was confirmed that the fiber cloth in the example had improved strength of the continuous fibers themselves. 【0213】 Examples 7 to 9: Ytterbium-containing alumina and mullite mixed fiber cloths were obtained in the same manner as in Example 1, except that the standing time in the impregnation solution was 24 hours. The obtained fiber cloths were subjected to the same impregnation, washing, preheating, and heat treatment processes (hereinafter, these processes are collectively referred to as the "doping cycle") once (Example 7), four times (Example 8), and nine times (Example 9) to obtain the ytterbium-containing alumina and mullite mixed fiber cloths of each example. 【0214】 Example 10 A ytterbium-containing alumina and mullite mixed fiber cloth was obtained in the same manner as in Example 5, except that the standing time in the impregnation solution was 24 hours. The obtained fiber cloth was subjected to one doping cycle to obtain the ytterbium-containing alumina and mullite mixed fiber cloth of this example. 【0215】 The results are shown in the table below. 【0216】 【0217】From the comparison of Examples 1, 7 to 9, and Examples 5 and 10, it can be seen that as the doping cycle increases, W ＡＶ It increased, and moreover, W ＣＶ A tendency for the dope metal content to decrease was observed, and it was confirmed that the manufacturing method of this embodiment allows for adjustment of the dope metal content without reducing uniformity. Furthermore, from Examples 8 and 9, W ＡＶ Even though it is 200 ppm or more, and even 500 ppm or more, W ＣＶ The values ​​were less than 0.48, and even less than 0.05, confirming that as the doped metal content increased, its uniformity also improved. 【0218】 Example 11 As a fiber cloth, a fiber cloth made of alumina with a denier count of 3000 denier (product name: Nextel Ceramics Cloth 610 DF-19, manufactured by 3M). ２ O ３ The zirconium-containing alumina fiber cloth of this example was obtained in the same manner as in Example 1, except that a content of 99% or more by mass and a fiber diameter of 13 μm were used, 4.9 g of zirconium(IV) acetylacetonate hydrate (product name: Tetrakis(2,4-pentanedionato) zirconium(IV), manufactured by Tokyo Chemical Industry Co., Ltd.) was used instead of ytterbium(III) acetylacetonate hydrate, and the standing time in the impregnation solution was 24 hours. 【0219】 Example 12 The zirconium-containing alumina fiber cloth obtained in Example 11 was subjected to four doping cycles under similar conditions to obtain the zirconium-containing alumina fiber cloth of this example. 【0220】 Example 13: As a fiber cloth, a fiber cloth made of alumina with a denier count of 4500 denier (product name: Nextel Ceramics Cloth 610 DF-13, manufactured by 3M). ２ O ３ The zirconium-containing alumina fiber cloth of this example was obtained in the same manner as in Example 11, except that a zirconium-containing alumina fiber cloth was used (content: 99% by mass or more, fiber diameter: 13 μm). 【0221】Comparative Example 5: A zirconium-containing alumina fiber cloth of this comparative example was obtained in the same manner as in Example 11, except that the complex-containing cloth, after being left to stand in the impregnation solution, was not stirred and mixed with ethanol. 【0222】 The results are shown in the table below. 【0223】 【0224】 [Preparation of CMC] <Preparation of raw material slurry A> 91 g of α-alumina powder (average particle size: 0.15 μm, BET specific surface area: 14 m²) ２ ( / g) and 0.94 g of spherical silica powder as an additive source (average particle size: 0.24 μm, BET specific surface area: 25 m²). ２ ( / g) and 1.9g of 3mol% yttrium-containing zirconia powder (average particle size: 0.04 μm, BET specific surface area: 14 m²). ２ A mixture of ( / g) was obtained to obtain a mixed powder. 31 g of dilute nitric acid water (pH=2) was mixed with this mixed powder, and a 10 mm diameter alumina ball was used as the grinding medium. The mixture was then subjected to a ball mill treatment for 24 hours to obtain raw material slurry A. The obtained raw material slurry A had a solid content concentration of 75% by mass. 【0225】 <Preparation of raw material slurry B> 91 g of α-alumina powder (average particle size: 0.15 μm, BET specific surface area: 14 m²) ２ ( / g) and 2.8g of spherical silica powder as an additive source (average particle size: 0.24 μm, BET specific surface area: 25 m²). ２ A mixture of ( / g) was obtained to obtain a mixed powder. 31 g of dilute nitrate water (pH=2) was mixed with this mixed powder, and a 10 mm diameter alumina ball was used as the grinding medium. The mixture was then treated with a ball mill for 24 hours to obtain raw material slurry B. The obtained raw material slurry had a solid content concentration of 75% by mass. 【0226】<Preparation of Raw Material Slurry C> 550 g of commercially available mullite powder (product name: KM101, manufactured by Kyoritsu Material Co., Ltd.) and 1300 g of ethanol were weighed and mixed for 3 hours in a bead mill using alumina beads with a diameter of 0.3 mm as the grinding medium to obtain a slurry. The obtained slurry was dried under reduced pressure at 60°C using a rotary evaporator to remove the solvent (ethanol), and the mullite powder (average particle size: 0.5 μm, BET specific surface area: 9.8 m²) was prepared. ２ 93.8 g of α-alumina powder (average particle size: 0.15 μm, BET specific surface area: 14 m²) was obtained. ２ ( / g), 93.8 g of mullite powder obtained by the above process (average particle size: 0.5 μm, BET specific surface area: 9.8 m²) ２ Raw material slurry C was obtained by mixing 54.9 g of pure water and 9.4 g of dispersant (product name: A-6114, manufactured by Toagosei Co., Ltd.) with 10 mm diameter alumina balls as the grinding medium and processing the mixture in a ball mill for 24 hours. 【0227】 Example 14 Twelve ytterbium-containing alumina and mullite mixed fiber cloths obtained by the same method as in Example 1 were laminated and impregnated with raw material slurry A, and then solidified by heat treatment at 70±20°C for 22 hours. This yielded a molded body with a width of 110 mm, a length of 240 mm, and a thickness of 2.5 mm. The molded body was heat-treated in an air atmosphere at 900°C to obtain a calcined body. The calcined body was heat-treated in an air atmosphere at 1100°C and then cooled to room temperature. After that, the temperature was raised again to 1200°C and heat-treated at that temperature to obtain the CMC of this example. 【0228】 The CMC in this embodiment consisted of a ytterbium-containing alumina and mullite mixed fiber cloth as the fiber cloth, and an alumina matrix containing silica and zirconia as the matrix. 【0229】 Examples 15 to 20: The CMC for each example was obtained in the same manner as in Example 14, except that a fiber cloth obtained in the same manner as in Examples 2 to 4 and 7 to 9 was used. 【0230】Example 21 The CMC of this example was obtained in the same manner as in Example 14, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Example 5 was used, and five sheets were laminated and impregnated into raw material slurry A. 【0231】 The CMC in this embodiment consisted of a ytterbium-containing alumina and mullite mixed fiber cloth, and an alumina matrix containing silica and zirconia. 【0232】 Example 22 The CMC of this example was obtained in the same manner as in Example 21, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Example 10 was used. 【0233】 Example 23 The CMC of this example was obtained in the same manner as in Example 14, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Example 6 was used, and seven layers of the fiber cloth were laminated. 【0234】 Comparative Example 6 A mixed fiber cloth made of alumina and mullite that has been desized in the same manner as in Example 1, with a denier count of 1500 denier (product name: Nextel Ceramics Cloth 720 EF-11, manufactured by 3M). ２ O ３ The CMC of this comparative example was obtained in the same manner as in Example 14, except that a content of 85% by mass and a fiber diameter of 13 μm were used. 【0235】 Comparative Example 7: The CMC of this comparative example was obtained in the same manner as in Example 14, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Comparative Example 1 was used. 【0236】 The results of the examples and comparative examples using raw material slurry A are shown in the table below. 【0237】 【0238】 The CMC in the examples and comparative examples had a CMC density of 2.62 g / cm³. ３ 2.77gcm or more ３The density difference was such that it did not affect the high-temperature creep characteristics. Nevertheless, the creep rupture time of the example was 25 hours or more, and even exceeded 100 hours, confirming that the high-temperature creep characteristics were higher than those of the CMC of Comparative Example 6, which included a fiber cloth without doped metal as a reinforcing material. 【0239】 Example 24 Five zirconium-containing alumina fiber cloths obtained by the same method as in Example 11 were laminated and impregnated with raw material slurry B, and then solidified by heat treatment at 90±20°C for 22 hours. This yielded a molded body with a width of 110 mm, a length of 240 mm, and a thickness of 2.0 mm. 【0240】 The molded body was heat-treated at 900°C in an air atmosphere to obtain a calcined body. The calcined body was then heat-treated at 1100°C in an air atmosphere and allowed to cool to room temperature. Subsequently, the temperature was raised again to 1200°C and heat-treated at that temperature to obtain the CMC of this embodiment. The CMC of this embodiment consisted of a zirconium-containing alumina fiber cloth as the fiber cloth, and an alumina and silica matrix. 【0241】 Example 25 The CMC of this example was obtained in the same manner as in Example 24, except that a zirconium-containing alumina fiber cloth obtained in the same manner as in Example 12 was used. 【0242】 Example 26 The CMC of this example was obtained in the same manner as in Example 24, except that a zirconium-containing alumina fiber cloth obtained in the same manner as in Example 13 was used, and seven layers of the fiber cloth were laminated. 【0243】 Comparative Example 8: The CMC of this comparative example was obtained in the same manner as in Example 24, except that a zirconium-containing alumina fiber cloth obtained in the same manner as in Comparative Example 5 was used. 【0244】 The results of the examples and comparative examples using raw material slurry B are shown in the table below. 【0245】 【0246】Example 27 Twelve ytterbium-containing alumina and mullite mixed fiber cloths obtained by the same method as in Example 1 were laminated and impregnated with raw material slurry C, and then solidified by heat treatment at 90±20°C for 22 hours. This yielded a molded body with a width of 110 mm, a length of 240 mm, and a thickness of 2.5 mm. The molded body was heat-treated in an air atmosphere at 900°C to obtain a calcined body. The calcined body was heat-treated in an air atmosphere at 1100°C and then cooled to room temperature. After that, the temperature was raised again to 1200°C and heat-treated at that temperature to obtain the CMC of this example. 【0247】 The CMC in this embodiment consisted of a ytterbium-containing alumina and mullite mixed fiber cloth as the fiber cloth, and an alumina and mullite matrix. 【0248】 Example 28 The CMC of this example was obtained in the same manner as in Example 27, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Example 5 was used, and five layers of the fiber cloth were laminated. 【0249】 Comparative Example 9: The CMC of this comparative example was obtained in the same manner as in Example 27, except that a ytterbium-containing alumina and mullite mixed fiber cloth obtained in the same manner as in Comparative Example 1 was used. 【0250】 The results of the examples and comparative examples using raw material slurry C are shown. 【0251】 【0252】 These examples and comparative examples confirmed that high-temperature creep characteristics were improved regardless of the matrix type. 【0253】 <Heat Resistance Evaluation> To evaluate the heat resistance of CMC, the CMC obtained in the examples and comparative examples were subjected to atmospheric exposure, 1200°C heat exposure, or 1250°C heat exposure, respectively, and the tensile strength and strength retention rate before and after treatment were determined. 【0254】 【0255】In all of the examples, the CMC showed improved tensile strength and high heat resistance after heat exposure treatment. Furthermore, the tensile strength of Example 14 before 1200°C heat exposure treatment was 217 MPa, which was higher than that of Example 21. From this, it was confirmed that the thinner the fiber bundle, the higher the tensile strength before heat exposure treatment. 【0256】 【0257】 【0258】 In all of the CMC examples, the strength retention rate at 1200°C exceeded 100%, confirming that the decrease in tensile strength after heat exposure treatment was suppressed. 【0259】 The entire contents of the specification, claims, drawings, and abstract of Japanese Patent Application No. 2024-216301, filed on December 11, 2024, and Japanese Patent Application No. 2025-011161, filed on January 27, 2025, are incorporated herein by reference as the disclosure of the specification. 【0260】 100: Fiber cloth 10: Cut piece for measurement 11: Measurement sample (unit region) for ICP emission spectroscopy analysis 200: External view showing the test piece used for tensile strength testing 200a: Length in the longitudinal direction 200b: Width of the end in the longitudinal direction 200c: Length in the longitudinal direction of the gauge section 200d: Width of the gauge section 300: STEM observation view of the fiber cloth 31: Crystal grains 32: Interface in crystal grains

Claims

1. A ceramic continuous fiber cloth characterized by containing a doped metal element, wherein the average unit content of the doped metal element is 10 ppm by mass or more and 1000 ppm by mass or less, and the coefficient of variation of the unit content of the doped metal element is less than 0.

48.

2. The ceramic continuous fiber cloth according to claim 1, wherein the doped metal element is one or more selected from the group consisting of rare earth elements, zirconium (Zr), chromium (Cr), and magnesium (Mg).

3. The ceramic continuous fiber cloth according to claim 1 or 2, wherein the ceramic continuous fiber cloth is one or more selected from the group consisting of silicon carbide fiber cloth, alumina fiber cloth, mullite fiber cloth, and alumina and mullite mixed fiber cloth.

4. A ceramic continuous fiber cloth according to any one of claims 1 to 3, wherein the average thickness is 0.2 mm or more.

5. A ceramic continuous fiber cloth according to any one of claims 1 to 4, comprising ceramic continuous fibers having a single fiber strength of 1.0 GPa or more.

6. A ceramic continuous fiber cloth according to any one of claims 1 to 5, comprising ceramic continuous fibers having a standard deviation of single fiber strength of 0.7 GPa or less.

7. The ceramic continuous fiber cloth according to any one of claims 1 to 6, wherein the ceramic continuous fiber cloth is at least one of an alumina fiber cloth containing zirconium, and an alumina and mullite mixed fiber cloth containing one or more selected from the group consisting of ytterbium, chromium, and yttrium.

8. A method for producing a ceramic continuous fiber cloth according to any one of claims 1 to 7, comprising contacting a ceramic continuous fiber cloth with a solution containing a metal acetylacenate complex to obtain a complex-containing cloth, washing the complex-containing cloth to obtain a washed cloth, and heat-treating the washed cloth.

9. The manufacturing method according to claim 8, wherein the washing is performed by stirring the washing solution.

10. The manufacturing method according to claim 8 or 9, wherein the washing is performed by stirring the washing solution while the complex-containing fiber cloth is laminated.

11. The manufacturing method according to claim 9 or 10, wherein the washing solution is one or more selected from methanol, ethanol, propanol, acetone, tetrahydrofuran, benzene, water, and heavy water.

12. The manufacturing method according to any one of claims 8 to 11, wherein the washing cloth is preheated by heat treatment at 500°C or more and less than 950°C, and then heat-treated at 950°C or more and 1300°C or less.

13. A ceramic matrix composite material comprising a ceramic continuous fiber cloth according to any one of claims 1 to 7.

14. A method for producing a ceramic matrix composite material, comprising compounding a ceramic continuous fiber cloth according to any one of claims 1 to 7 with a ceramic matrix.

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