A method and device for testing high-temperature oxidation performance of a ceramic matrix composite material

Abstract

The application belongs to the field of ceramic matrix composite material test, and particularly relates to a ceramic matrix composite material high-temperature oxidation performance test method and device, which comprises an oxidation test mechanism, a cutting mechanism and a tensile test mechanism; the oxidation test mechanism comprises an induction heating device, a heat source and a support, the induction heating device comprises an induction coil and a power supply, the heat source is arranged in the induction coil, the support is arranged on the axis of the induction coil, and the tubular test piece is arranged between the induction coil and the heat source; the cutting mechanism is used for cutting the heated tubular test piece according to different temperature intervals to obtain annular samples for oxidation test under different temperature intervals; and the tensile test mechanism is used for testing the tensile strength of the annular samples. The application can complete the high-temperature oxidation test of the material at different temperatures in one test, greatly improves the efficiency of the high-temperature oxidation test of the ceramic matrix composite material, saves the test cost and shortens the test period.

Description

Technical Field

[0001] This invention belongs to the field of ceramic matrix composite material testing, specifically relating to a method and apparatus for testing the high-temperature oxidation performance of ceramic matrix composite materials. Background Technology

[0002] Ceramic matrix composites have become a superior choice for materials used in the nozzle extension section of liquid rocket upper stage engines due to their excellent properties, including high temperature resistance, thermal shock resistance, high strength at high temperatures, high toughness, high hardness, high wear resistance, high chemical stability, high design tolerance, low density, and low coefficient of thermal expansion.

[0003] As a key material in the aerospace field, the high-temperature oxidation performance of ceramic matrix composites is an important factor affecting their service life. Traditional high-temperature oxidation tests of ceramic matrix composites generally suffer from problems such as long test cycles, single test control variables, and deviations between the test environment and the actual environment due to equipment limitations. These problems slow down the research speed and progress of ceramic matrix composites and increase the difficulty of research. Therefore, there is an urgent need for innovative high-temperature oxidation test methods for ceramic matrix composites to test their high-temperature oxidation performance and improve test efficiency and accuracy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and apparatus for testing the high-temperature oxidation performance of ceramic matrix composites that can simulate multiple temperature conditions in a single test.

[0005] This invention provides a high-temperature oxidation performance testing device for ceramic matrix composites, comprising an oxidation testing mechanism, a cutting mechanism, and a tensile testing mechanism;

[0006] The oxidation testing mechanism includes an induction heating device, a heat source, and a support. The induction heating device includes an induction coil and a power supply. The heat source is disposed inside the induction coil. The support is disposed on the axis of the induction coil and is used to place the tubular specimen between the induction coil and the heat source.

[0007] The cutting mechanism is used to cut the heated tubular specimen according to different temperature ranges to obtain ring-shaped samples for oxidation testing at different temperature ranges.

[0008] The tensile testing mechanism is used to test the tensile strength of ring-shaped samples.

[0009] Furthermore, the tensile testing mechanism includes two collinearly arranged and linearly movable tie rods and a semi-circular tie head disposed on one side of the two tie rods. The two semi-circular tie heads can form a circular head after the two tie rods approach each other, and the annular sample is fitted onto the circular head.

[0010] Furthermore, the support includes a column, a base disposed at both ends of the column, and a heat source mounting plate, wherein the dimensions of the heat source mounting plate and the column are smaller than the inner diameter of the tubular specimen.

[0011] Furthermore, the support also includes a specimen mounting plate disposed on the column, the specimen mounting plate being located between the heat source mounting plate and the base, and having a size greater than or equal to the outer diameter of the tubular specimen.

[0012] Furthermore, the specimen mounting plate is located outside the induction coil.

[0013] Furthermore, the length of the heat source is shorter than the length of the induction coil and the tubular specimen, and the length of the induction coil is shorter than the length of the tubular specimen.

[0014] Furthermore, the axes of the heat source, the tubular specimen, and the induction coil coincide.

[0015] This invention also provides a method for testing the high-temperature oxidation properties of ceramic matrix composites, comprising the following steps:

[0016] S1. The tubular specimen is heated in an oxygen-containing environment, and the heating creates a temperature gradient distribution on the tubular specimen.

[0017] S2. Remove the tubular specimen from the oxidation testing mechanism and cut it into multiple ring-shaped samples according to different oxidation temperature ranges;

[0018] S3. Perform tensile strength tests on multiple ring-shaped samples.

[0019] Furthermore, in step S1, an oxidation testing mechanism is used to heat the tubular specimen. The oxidation testing mechanism includes an induction heating device, a heat source, and a support. The induction heating device includes an induction coil and a power source. The heat source is disposed inside the induction coil, and the support is disposed on the axis of the induction coil for placing the tubular specimen between the induction coil and the heat source.

[0020] Furthermore, the tubular specimen forms a symmetrical temperature gradient distribution on both sides with the heat source as the center.

[0021] The beneficial effects of this invention are: 1. It can complete the high-temperature oxidation test of materials at different temperatures in one test, which greatly improves the efficiency of high-temperature oxidation test of ceramic matrix composites, saves test costs and shortens the test cycle;

[0022] 2. The present invention uses tubular materials, which are closer to the oxidation environment of ceramic matrix composites in actual service, making the experimental data more valuable for research.

[0023] 3. Using ring-shaped samples for tensile strength testing to characterize the residual strength of ceramic matrix composites is more in line with the stress state of materials in actual applications.

[0024] 4. The oxidation testing mechanism, through the combination of induction coils and heat sources, solves the problem that high-frequency induction heating cannot directly heat ceramic matrix composite structural components, enabling high-temperature oxidation tests on tubular ceramic matrix composites. Furthermore, by placing the tubular specimen between the induction coil and the heat source, and adjusting the length ratio and position of the heat source, induction coil, and tubular specimen, a portion of a large-sized tubular specimen can be heated in a single test. This creates a temperature gradient distribution that diffuses outward from the heated area, allowing for oxidation tests at different temperatures on different parts of the same tubular specimen. This enables the acquisition of high-temperature oxidation data at different temperatures from a single test, overcoming the limitation of a single experimental variable in traditional high-temperature oxidation tests. This significantly improves experimental efficiency, reduces testing costs, and facilitates subsequent residual strength tests on ring-shaped samples at different temperatures.

[0025] 5. The high-temperature oxidation performance testing device provided by the present invention has few restrictions on the size of tubular specimens and can select samples with sizes of millimeters, centimeters, decimeters or even meters for oxidation assessment.

[0026] 6. The test space of this high-temperature oxidation test device is not enclosed. On the one hand, it can simplify the structure of the device and reduce the cost of the device. On the other hand, the unenclosed structure allows the experimental environment to always be connected with the atmospheric environment, with sufficient oxidation atmosphere, which is close to the actual application environment of the material and makes it more convenient for observation and test operation.

[0027] 7. The use of induction heating method results in a fast heating rate, which can quickly reach the specified test temperature, reducing experimental errors and improving experimental efficiency. Attached Figure Description

[0028] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Appendix Figure 2 This is a schematic diagram of induction heating in this invention;

[0030] Appendix Figure 3 This is a schematic diagram showing the heating temperature of the tubular specimen in this invention;

[0031] Appendix Figure 4 This is a schematic diagram of the tensile testing mechanism in this invention.

[0032] In the figure, 1-induction heating device; 11-induction coil; 12-power supply; 2-heat source; 3-support; 31-column; 32-base; 33-specimen mounting plate; 34-heat source mounting plate; 4-infrared thermal imager; 5-controller; 6-tubular specimen; 7-ring sample; 8-tensile testing mechanism; 81-pull rod; 82-semi-circular pull head; 83-linear drive component; 84-bolt. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0035] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0038] As attached Figure 1-Appendix Figure 4 As shown, the present invention provides a high-temperature oxidation performance testing device for ceramic matrix composites, including an oxidation testing mechanism, a cutting mechanism, and a tensile testing mechanism 8;

[0039] The oxidation testing mechanism includes an induction heating device 1, a heat source 2, and a support 3. The induction heating device 1 includes an induction coil 11 and a power supply 12. The power supply 12 is preferably a high-frequency power supply to power the induction coil 11. It should be noted that the induction heating device 1 also has other auxiliary equipment, such as a water cooling system, which is not an improvement of this invention and will not be described in detail here. The heat source 2 is set inside the induction coil 11 and is used to react with the induction coil 11. The induction coil 11 induction heats the heat source 2 at high frequency, thereby indirectly heating the tubular specimen 6. The support 3 is set on the axis of the induction coil 11 and is used to place the tubular specimen 6 between the induction coil 11 and the heat source 2. This oxidation testing mechanism can heat a part of a large-sized tubular specimen 6 in one test, so that the temperature gradient is diffused outward from the heated area, thereby realizing oxidation tests at different temperatures on different parts of the same tubular specimen 6. High-temperature oxidation data of materials at different temperatures can be obtained in one test, breaking through the limitation of single test variables in traditional high-temperature oxidation tests.

[0040] The cutting mechanism is used to cut the heated tubular specimen 6 according to different temperature ranges to obtain annular samples 7 for oxidation testing at different temperature ranges, thereby facilitating subsequent tensile strength testing at different temperatures.

[0041] The tensile testing mechanism 8 is used to perform tensile strength testing on the ring sample 7. The ring tensile strength test is used to characterize the residual strength of the ceramic matrix composite material, which is more in line with the stress state of the material in actual applications.

[0042] The high-temperature oxidation performance testing device provided by this invention is used to conduct high-temperature oxidation tests and residual strength tests at different temperatures on tubular ceramic matrix composite materials, and has the following effects:

[0043] 1. It can complete the high-temperature oxidation test of materials at different temperatures in one test, which greatly improves the efficiency of high-temperature oxidation test of ceramic matrix composites, saves test costs and shortens the test cycle;

[0044] 2. Traditional high-temperature oxidation tests often use strip-shaped samples. During oxidation, the oxidizing atmosphere enters from the side section of the sample and corrodes the material. However, the oxidation corrosion of ceramic matrix composites, which are used in aerospace components, mainly comes from the surface of the material. This invention uses tubular materials, which are closer to the oxidation environment of ceramic matrix composites in actual service, making the experimental data more valuable for research.

[0045] 3. Using ring-shaped sample 7 for tensile strength testing to characterize the residual strength of ceramic matrix composites is more in line with the stress state of materials in actual applications;

[0046] 4. The oxidation testing mechanism, through the combination of induction coil 11 and heat source 2, can solve the problem that high-frequency induction heating cannot directly heat ceramic matrix composite structural parts, enabling high-temperature oxidation tests on tubular ceramic matrix composites. On the other hand, the tubular specimen 6 is placed between induction coil 11 and heat source 2. By adjusting the length ratio and position of heat source 2, induction coil 11 and tubular specimen 6, a portion of a large-sized tubular specimen 6 can be heated by heat source 2 in a single test, causing a temperature gradient distribution to diffuse outward from the heated area. This allows for oxidation tests at different temperatures on different parts of the same tubular specimen 6. High-temperature oxidation data of the material at different temperatures can be obtained in a single test, breaking through the limitation of a single test variable in traditional high-temperature oxidation tests, greatly improving experimental efficiency, reducing test costs, and facilitating subsequent residual strength tests on ring-shaped samples 7 at different temperatures.

[0047] 5. The high-temperature oxidation performance testing device provided by the present invention has few size restrictions on the tubular specimen 6, and can select samples with millimeter, centimeter, decimeter or even meter size for oxidation assessment;

[0048] 6. The test space of this high-temperature oxidation test device is not enclosed. On the one hand, it can simplify the structure of the device and reduce the cost of the device. On the other hand, the unenclosed structure allows the experimental environment to always be connected with the atmospheric environment, with sufficient oxidation atmosphere, which is close to the actual application environment of the material and makes it more convenient for observation and test operation.

[0049] 7. The use of induction heating method results in a fast heating rate, which can quickly reach the specified test temperature, reducing experimental errors and improving experimental efficiency.

[0050] In one embodiment, the tensile testing mechanism 8 includes two collinearly arranged and linearly movable tie rods 81 and a semi-circular pull head 82 disposed on opposite sides of the two tie rods 81. The two semi-circular pull heads 82 form a circular head when the two tie rods 81 approach each other. The annular sample 7 is fitted onto the circular head. The tensile testing mechanism 8 provided in this embodiment can easily complete the installation and tensile testing of the annular sample 7, thereby improving testing efficiency. (Reference) Figure 4The pull rod 81 is pulled by a linear drive 83, which is preferably a hydraulic cylinder. In one specific embodiment, a pull rod 81 is provided on each of the left and right sides of a semi-circular pull head 92. The two pull rods 81 are connected to the semi-circular pull head 92 by detachable bolts 84, which facilitates the installation of the annular sample 7 while ensuring that the pulling force is applied symmetrically to the semi-circular pull head 82.

[0051] In one embodiment, the support 3 includes a column 31, a base 32 disposed at both ends of the column 31, and a heat source mounting plate 34. The dimensions of the heat source mounting plate 34 and the column 31 are smaller than the inner diameter of the tubular specimen 6. The column 31 is used to connect the base 32 and the heat source mounting plate 34. The base 32 is used to support the entire support 3, so that the support 3 stands on the ground or a working platform. The heat source mounting plate 34 is used to install the heat source 2 inside the induction coil 11. The support 3 provided in this embodiment has a simple and reliable structure. The material of the support 3 has a melting point higher than the test temperature and has good high-temperature chemical stability. It is not easy to react with high-temperature nickel-based alloys or graphite. In addition, the heat source mounting plate 34 is preferably made of corundum. Corundum has excellent corrosion resistance, high melting point and insulation, and is suitable for use as a supporting structure in high-temperature environments.

[0052] In one embodiment, the support 3 further includes a specimen mounting plate 33 disposed on the column 31. The specimen mounting plate 33 is located between the heat source mounting plate 34 and the base 32, and its size is greater than or equal to the outer diameter of the tubular specimen 6. The specimen mounting plate 33 is used to mount the tubular specimen 6. In this embodiment, the functionality of the support 3 can be improved while ensuring the simplicity of the support 3 structure. In addition, the heat source mounting plate 34 is preferably made of corundum material. Corundum has excellent corrosion resistance, high melting point and insulation, and is suitable for use as a supporting structure in high temperature environments.

[0053] In one embodiment, the specimen mounting plate 33 is located outside the induction coil 11, thereby facilitating one end of the tubular specimen 6 to be located outside the induction coil 11, and thus providing more temperature difference when forming a temperature gradient distribution on the tubular specimen 6.

[0054] In one embodiment, the length of the heat source 2 is shorter than the length of the induction coil 11 and the tubular specimen 6. Thus, when a temperature gradient distribution is formed on the tubular specimen 6, the axial distance of the heat source 2 is the induction heating area, and the temperature decreases as it diffuses outward. By designing the length of the heat source 2 to be as short as possible, it is easy to control the induction coil 11 to heat the entire heat source 2, and it is also easy to form a temperature gradient distribution on the tubular specimen 6.

[0055] In one embodiment, the length of the induction coil 11 is shorter than the length of the tubular specimen 6, which can further ensure that the tubular specimen 6 forms a temperature gradient distribution in the axial direction.

[0056] In one embodiment, the axes of the heat source 2, the tubular specimen 6, and the induction coil 11 are aligned, which can ensure that the circumferential temperature of the tubular specimen 6 is consistent, thereby ensuring the accuracy of the oxidation test.

[0057] The heat source has good electrical conductivity, a melting point higher than the test temperature, good high-temperature stability, and does not react with ceramic matrix composites. Generally, high-temperature nickel-based alloys or graphite are used as heat sources. In a preferred embodiment, the heat source 2 is graphite. Graphite has high temperature resistance, high thermal conductivity, excellent corrosion resistance and customizability, as well as high stability, and is therefore suitable for use as heat source 2.

[0058] In one embodiment, the high-temperature oxidation test apparatus further includes an infrared thermal imager 4 for monitoring the temperature of the tubular specimen 6. The infrared thermal imager 4 is placed at a certain distance from the induction coil 11, and the observation mirror is at the same height as the tubular specimen 6 to detect the temperature of the area to be tested on the tubular specimen 6.

[0059] In one embodiment, the high-temperature oxidation test apparatus also includes a controller 5 connected to the infrared thermal imager 4 and the power supply 12, which can be used to control the current of the power supply 12 to control the temperature, and to record and display the observation data of the infrared thermal imager 4, thereby achieving precise control of the surface temperature of the tubular specimen 6.

[0060] In one embodiment, the two ends of the tubular specimen 6 are sealed to ensure that oxidation occurs only on the inner and outer surfaces of the material, thus avoiding the influence of cross-sectional oxidation and improving the test accuracy. Specifically, the two ends of the tubular specimen 6 are sealed with SiC micro powder to prevent the oxidizing atmosphere from entering from the two ends of the cross-section when the material is oxidized at high temperature, and to control the oxidation to mainly occur on the inner and outer surfaces of the tube, simulating the actual service environment of ceramic matrix composites used in aerospace.

[0061] In one specific embodiment, the tubular specimen 6 is an uncoated hollow tube of ceramic matrix composite material with a length of 1m, a wall thickness of 2mm, and a diameter of 100mm. The heat source is a solid cylinder made of graphite with a diameter of 50mm and a height of 100mm. The ceramic matrix composite material tube is used as the tubular specimen 6 for testing. The current is adjusted to stabilize the surface temperature of the central region of the material at 1300℃. The material forms a temperature gradient distribution from high to low from the induction heating area to both ends, realizing high-temperature testing of different parts of the same material at different temperatures. The material is cut according to the temperature region to obtain a batch of samples that have undergone high-temperature oxidation for the same time at different temperatures, which greatly speeds up the test progress and improves the test efficiency.

[0062] This invention also provides a method for testing the high-temperature oxidation properties of ceramic matrix composites, comprising the following steps:

[0063] S1. The tubular specimen 6 is heated in an oxygen-containing environment, and the heating creates a temperature gradient distribution on the tubular specimen 6.

[0064] S2. Remove the tubular specimen 6 from the oxidation testing mechanism and cut it into multiple ring-shaped samples 7 according to different oxidation temperature ranges. In S2, cut more than 3 ring-shaped samples for each temperature range for tensile testing to reduce test error. The height of the ring-shaped sample depends on the temperature range distribution when the pipe is heated. The heating temperature difference between the two ends of the cut ring-shaped sample in the test should not be greater than 10℃.

[0065] S3. Tensile strength tests were performed on multiple annular samples 7.

[0066] The high-temperature oxidation performance testing method for ceramic matrix composites provided by this invention can heat a portion of a large-sized sample in a single test using a heat source, causing a temperature gradient distribution to diffuse outward from the heated area. Oxidation and tensile tests at different temperatures can be performed on different parts of the same sample in a single test. This method can obtain high-temperature oxidation data and tensile strength data of the material at different temperatures in a single test, breaking through the limitation of a single test variable in traditional high-temperature oxidation tests, greatly improving experimental efficiency and reducing experimental costs.

[0067] In one embodiment, step S1 uses an oxidation testing mechanism to heat the tubular specimen 6. The oxidation testing mechanism includes an induction heating device 1, a heat source 2, and a support 3. The induction heating device 1 includes an induction coil 11 and a power supply 12. The heat source 2 is disposed inside the induction coil 11, and the support 3 is disposed on the axis of the induction coil 11 to place the tubular specimen 6 between the induction coil 11 and the heat source 2. Thus, under this oxidation testing mechanism, a portion of a large-sized sample can be heated by the heat source in a single test, causing a temperature gradient distribution to diffuse outward from the heated area, thereby achieving efficient and high-precision temperature gradient heating.

[0068] In one embodiment, the tubular specimen 6 forms a symmetrical temperature gradient distribution on both sides with the heat source 2 as the center. In a preferred embodiment, the central symmetry planes of the tubular specimen 6, the heat source 2, and the induction coil 11 are coplanar. Thus, except for the highest temperature, there are two annular samples 7 in other temperature ranges, which can be used for control testing. At this time, the length of the heat source 2 can be adjusted so that the highest temperature range can also be divided into two annular samples 7, so that control testing can be carried out in each temperature range.

[0069] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings, or direct / indirect applications in other related technical fields, under the inventive concept of the present invention, are included within the patent protection scope of the present invention.

Claims

1. A device for testing the high-temperature oxidation properties of ceramic matrix composites, characterized in that, Including oxidation testing mechanism, cutting mechanism and tensile testing mechanism (8); The oxidation testing mechanism includes an induction heating device (1), a heat source (2), and a support (3). The induction heating device (1) includes an induction coil (11) and a power supply (12). The heat source (2) is located inside the induction coil (11). The support (3) is located on the axis of the induction coil (11) and is used to place the tubular specimen (6) between the induction coil (11) and the heat source (2). The length of the heat source (2) is shorter than the length of the tubular specimen (6). The cutting mechanism is used to cut the heated tubular specimen (6) according to different temperature ranges to obtain ring-shaped samples (7) for oxidation testing at different temperature ranges. The tensile testing mechanism (8) is used to perform tensile strength testing on the annular sample (7).

2. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 1, characterized in that, The tensile testing mechanism (8) includes two collinearly arranged and linearly movable pull rods (81) and a semi-circular pull head (82) arranged on the opposite side of the two pull rods (81). The two semi-circular pull heads (82) can form a circular head after the two pull rods (81) approach each other. The annular sample (7) is fitted on the circular head.

3. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 1, characterized in that, The support (3) includes a column (31), a base (32) set at both ends of the column (31), and a heat source mounting plate (34). The dimensions of the heat source mounting plate (34) and the column (31) are smaller than the inner diameter of the tubular specimen (6).

4. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 3, characterized in that, The bracket (3) also includes a specimen mounting plate (33) set on the column (31), the specimen mounting plate (33) being located between the heat source mounting plate (34) and the base (32), and having a size greater than or equal to the outer diameter of the tubular specimen (6).

5. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 4, characterized in that, The specimen mounting plate (33) is located outside the induction coil (11).

6. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 1, characterized in that, The length of the heat source (2) is shorter than the length of the induction coil (11), and the length of the induction coil (11) is shorter than the length of the tubular specimen (6).

7. The high-temperature oxidation performance testing device for ceramic matrix composites as described in claim 5, characterized in that, The axes of the heat source (2), the tubular specimen (6), and the induction coil (11) coincide.

8. A method for testing the high-temperature oxidation properties of ceramic matrix composites, characterized in that, Includes the following steps: S1. The tubular specimen (6) is heated in an oxygen-containing environment, and the heating forms a temperature gradient distribution on the tubular specimen (6); S2. Remove the tubular specimen (6) from the oxidation testing mechanism and cut it into multiple ring-shaped samples (7) according to different oxidation temperature ranges. S3. Tensile strength tests were performed on multiple annular samples (7).

9. The method for testing the high-temperature oxidation performance of ceramic matrix composites as described in claim 8, characterized in that, In step S1, the tubular specimen (6) is heated using an oxidation testing mechanism. The oxidation testing mechanism includes an induction heating device (1), a heat source (2), and a support (3). The induction heating device (1) includes an induction coil (11) and a power supply (12). The heat source (2) is located inside the induction coil (11), and the support (3) is located on the axis of the induction coil (11) to place the tubular specimen (6) between the induction coil (11) and the heat source (2).

10. The method for testing the high-temperature oxidation performance of ceramic matrix composites as described in claim 9, characterized in that, The tubular specimen (6) forms a symmetrical temperature gradient distribution on both sides with the heat source (2) as the center.

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