Ytterbium-scandium disilicate solid solution ceramic material as well as preparation method and application thereof

Abstract

The invention discloses an ytterbium-scandium bisilicate solid solution ceramic material as well as a preparation method and application thereof, and belongs to the technical field of environmental barrier coating materials. According to the ytterbium-scandium disilicate solid solution ceramic material disclosed by the invention, through component design, the chemical formula of the ytterbium-scandium disilicate solid solution ceramic material is YbxSc (2-x) Si2O7, the molar atomic weight x of Sc replacing Yb meets the relation of 0 < x < 2, and as Yb2Si2O7 and Sc2Si2O7 can maintain stable single beta phases at the temperature of 1700 DEG C or below, the ytterbium-scandium disilicate solid solution ceramic material can be used for preparing the ytterbium-scandium disilicate solid solution ceramic material. The component does not generate phase change in an air atmosphere environment at 1500 DEG C, has excellent phase stability, and meets the requirements of advanced environmental barrier coating application on high-temperature phase stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental barrier coating materials, and in particular relates to an ytterbium-scandium double silicate solid solution ceramic material, a preparation method thereof, and an application thereof. Background Art

[0002] Carbon-carbon (C / C) composite material is a high-performance composite material with carbon fiber as reinforcement and carbon as matrix, which has the remarkable characteristics of low density, high specific strength, high specific modulus, small thermal expansion coefficient and excellent high temperature mechanical properties. Its density is usually 1.6-2.0g / cm 3 The C / C composite material has a very low coefficient of thermal expansion, showing excellent thermal stability, and can maintain dimensional stability in high temperature environments, avoiding deformation or failure due to thermal stress. More importantly, the mechanical properties of C / C composite materials in high temperature environments show a unique abnormal temperature effect, that is, as the temperature increases, its strength not only does not decrease, but increases. This feature enables it to maintain excellent mechanical properties under extreme high temperature conditions, and is particularly suitable for high temperature, high pressure, and high stress working environments such as aircraft engines. For example, in the hot end components of aircraft engines (such as combustion chambers, turbine blades, nozzles, etc.), C / C composite materials can withstand operating temperatures of up to 2000°C and have excellent thermal shock resistance and oxidation resistance, which significantly improves the thermal efficiency and reliability of the engine. In addition, C / C composite materials also have good corrosion resistance and fatigue resistance, and can work stably for a long time in complex thermal-mechanical coupling environments. Therefore, C / C composite materials have broad application prospects in high-end technology fields such as aerospace, nuclear energy, and high-speed braking systems. Especially in the hot end components of aircraft engines, they have become one of the irreplaceable key materials.

[0003] However, C / C composites rapidly oxidize and fail in high-temperature oxygen environments. Silicon carbide (SiC) ceramics are widely used as antioxidant coating materials for C / C composites due to their excellent oxidation resistance. In high-temperature oxygen environments, a layer of flowing SiO2 glass phase forms on the coating surface, which can fill coating gaps and repair coating cracks, thereby preventing further oxygen erosion (L. Li, HJ Li, HJ Lin, et al. Comparison of the oxidation behaviors of SiC coatings on C / C composites prepared by pack cementation and chemical vapor deposition [J]. Surface and Coatings Technology, 2016, 302: 56-64.). However, during service, the high-temperature water vapor and oxygen generated by aircraft engines can corrode SiC and SiO2, causing the SiC coating to rapidly fail (XXCao, XGLuan, YLWang, et al. Oxidation and corrosion behavior of 2Dlaminated SiC / SiC with Si / mullite / BSAS EBC in dry oxygen / water vapor at 1200°C [J]. Corrosion Science, 2023, 219: 111-237). Therefore, coating C / C composites with SiC coatings with environmental barrier coatings (EBCs) is an effective means of extending the service life of composites in high-temperature water-oxygen coupled environments. Rare earth disilicates are the most promising candidate materials for EBCs. Among them, ytterbium disilicate (Yb2Si2O7) is widely used due to its characteristics of not undergoing phase transitions at high temperatures and having a thermal expansion coefficient that closely matches that of SiC. However, in a long-term high-temperature water-oxygen corrosion environment at 1316°C, a porous layer of Yb2SiO5 with a high thermal expansion coefficient will form on the surface of Yb2Si2O7, and water vapor and other substances will penetrate into the interior through these pores, causing the performance of the material to deteriorate (BTRichards,KAYoung,FDFrancqueville,et al.Response of ytterbiumdisilicate–silicon environmental barrier coatings to thermal cycling in watervapor[J].ActaMaterialia,2016,106:1-14.).Therefore, the existing Yb2Si2O7 environmental barrier coating is difficult to meet the working needs of the new generation of aircraft engines. Summary of the Invention

[0004] The purpose of the present invention is to provide an ytterbium-scandium double silicate solid solution ceramic material and its preparation method and application, so as to solve the technical problem that the existing surface coating environmental barrier coating is difficult to meet the use requirements of long-term high-temperature water-oxygen corrosion environment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The present invention discloses a ytterbium-scandium double silicate solid solution ceramic material, wherein the chemical formula of the ytterbium-scandium double silicate solid solution ceramic material is Yb x Sc (2-x) Si2O7;

[0007] Wherein: x is the molar atomic weight of Sc replacing Yb; and 0<x<2.

[0008] The present invention also discloses a method for preparing the above-mentioned ytterbium-scandium double silicate solid solution ceramic material, comprising the following steps:

[0009] According to the above chemical formula, ytterbium oxide powder, scandium oxide powder and silicon dioxide powder are weighed as reaction raw materials;

[0010] Mixing the reaction raw materials with the solvent to obtain a mixed slurry;

[0011] The mixed slurry is post-processed to obtain mixed powder; the mixed powder is sequentially subjected to pressureless sintering and dry pressing-pressureless sintering to obtain ytterbium-scandium double silicate solid solution ceramic material.

[0012] Furthermore, the purity of the ytterbium oxide powder, the scandium oxide powder and the silicon dioxide powder is ≥99.9 wt %, and the original particle size is 200-800 meshes.

[0013] Furthermore, the solvent is ethanol; the mass ratio of the reaction raw materials to the solvent is 5:1.

[0014] Furthermore, the post-processing includes drying and screening performed in sequence;

[0015] The process steps of the dry pressing-pressureless sintering treatment are: performing pressureless sintering on the mixed powder and then performing physical and mechanical treatment, placing it in a mold for cold pressing to obtain an ytterbium-scandium double silicate solid solution ceramic block material; then placing the ytterbium-scandium double silicate solid solution ceramic block material in a heat treatment device for pressureless sintering to obtain an ytterbium-scandium double silicate solid solution ceramic material.

[0016] Furthermore, the cold pressing pressure is 15-25 MPa, and the holding time is 3-5 minutes.

[0017] Furthermore, the pressureless sintering is carried out in normal pressure and air medium; the temperature of the pressureless sintering is 1400-1600° C., and the holding time is 8-12 hours.

[0018] Furthermore, the physical and mechanical treatment is a ball milling method in an alcohol medium, followed by drying and sieving to obtain an ytterbium-scandium double silicate solid solution ceramic material with a particle size of 0.5 to 5 μm.

[0019] The invention also discloses the application of the ytterbium-scandium double silicate solid solution ceramic material in environmental barrier coating materials.

[0020] Furthermore, the operating temperature of the environmental barrier coating material is 1300-1500°C.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention discloses a ytterbium-scandium double silicate solid solution ceramic material. Through component design, the chemical formula of the ytterbium-scandium double silicate solid solution ceramic material is Yb x Sc (2-x) Si2O7, where the molar atomic weight x of Sc replacing Yb satisfies the relationship 0<x<2. Since both Yb2Si2O7 and Sc2Si2O7 maintain a stable single β phase below 1700°C, this composition does not undergo phase transitions at 1500°C in an air atmosphere, exhibiting excellent phase stability and meeting the high-temperature phase stability requirements for advanced environmental barrier coating applications. Experimental results demonstrate that the ytterbium-scandium disilicate solid solution ceramic material disclosed herein exhibits excellent resistance to high-temperature water vapor corrosion. When tested at 1500°C in a 90% H2O-10% O2 atmosphere for 100 hours, the weight loss rate is significantly lower than that of pure ytterbium disilicate, demonstrating the significant economic value of this solid solution as a novel environmental barrier coating material.

[0023] The present invention also discloses a preparation method of the above-mentioned ytterbium-scandium double silicate solid solution ceramic material. By adopting a two-step dry pressing-pressureless sintering method, it can ensure that the raw material powder is evenly distributed during the mixing, molding and sintering processes, avoiding component segregation; through the high-temperature diffusion effect of pressureless sintering, ytterbium (Yb), scandium (Sc) and silicon (Si) elements can fully react to form a uniform solid solution structure, ensuring the stability of material performance; dry pressing molding can prepare ceramic block materials with complex shapes through mold design to meet the needs of different application scenarios; no external pressure is required during the pressureless sintering process, avoiding material deformation or cracking problems caused by uneven pressure distribution; this method has a simple process, and the prepared ceramic material has high purity, good high-temperature phase stability and excellent resistance to water and oxygen corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 X-ray diffraction patterns of the ytterbium-scandium double silicate solid solution ceramic bulk materials prepared in Examples 1 to 3 of the present invention;

[0025] Wherein: a-Example 1; b-Example 2; c-Example 3;

[0026] Figure 2 Macroscopic morphology of the ytterbium-scandium double silicate solid solution ceramic bulk material prepared in Examples 1 to 3 of the present invention before and after testing at 1500° C. in 90% H 2 O-10% O 2 for 100 hours;

[0027] Figure 3 SEM photographs of the ytterbium-scandium double silicate solid solution ceramic bulk material prepared in Examples 1 to 3 of the present invention before and after testing at 1500° C. in 90% H 2 O-10% O 2 for 100 hours;

[0028] Among them: a-Yb 1.5 Sc 0.5 SEM photos of Si2O7 ceramic surface morphology; b-Yb 1.0 Sc 1.0 SEM photos of Si2O7 ceramic surface morphology; c-Yb 0.5 Sc 1.5 SEM photos of Si2O7 ceramic surface morphology;

[0029] Figure 4 Weight loss curves of the ytterbium-scandium double silicate solid solution ceramic bulk materials prepared in Examples 1 to 3 of the present invention and the pure ytterbium double silicate ceramic bulk material prepared in Comparative Example 1 after being tested at 1500°C and 90% H2O-10% O2 for 100 hours. DETAILED DESCRIPTION

[0030] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0031] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0032] Herein, all features such as values, amounts, amounts, and concentrations defined in numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to include and specifically disclose all possible subranges and individual values within the range (including integers and fractions).

[0033] In this document, unless otherwise specified, “include,” “including,” “contains,” “has” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0034] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0035] The present invention provides an ytterbium-scandium double silicate solid solution ceramic material, wherein the chemical formula of the ytterbium-scandium double silicate solid solution ceramic material is Yb x Sc (2-x) Si2O7; wherein the molar atomic weight x of Sc replacing Yb ranges from 0 to x to 2.

[0036] The present invention also discloses a method for preparing the above-mentioned ytterbium-scandium double silicate solid solution ceramic material, comprising the following steps:

[0037] Step 1: Use ytterbium oxide, scandium oxide and silicon dioxide powder as raw materials to make Yb x Sc (2-x) In Si2O7, Yb x Sc (2-x) : The molar ratio of Si:O is 1:2:7, wherein the molar atomic weight x of Sc replacing Yb ranges from 0<x<2;

[0038] Step 2: Using ethanol as a solvent, the original powder is ball-milled and mixed to form a slurry. The slurry is dried and sieved to obtain a mixed powder. The mixed powder is pressurelessly sintered in a heat treatment device, and then placed in a mold for cold pressing to obtain an ytterbium-scandium double silicate solid solution ceramic block material. The ytterbium-scandium double silicate solid solution ceramic block material is then placed in a heat treatment device for pressureless sintering, and then subjected to physical and mechanical treatment to obtain an ytterbium-scandium double silicate solid solution ceramic material.

[0039] Preferably, the mass ratio of the reaction raw materials to ethanol is 5:1.

[0040] Preferably, the cold press molding pressure is 15-25 MPa, and the holding time is 3-5 minutes.

[0041] Preferably, the pressureless sintering is carried out in normal pressure and air medium; the pressureless sintering temperature is 1400-1600°C, and the holding time is 8-12 hours.

[0042] Preferably, the physical and mechanical treatment is ball milling in an alcohol medium, followed by drying and sieving to obtain an ytterbium-scandium double silicate solid solution ceramic material with a particle size of 0.5 to 5 μm.

[0043] Preferably, the particle size of the ytterbium-scandium double silicate solid solution ceramic material is 0.5-5 μm.

[0044] The invention also discloses the application of the ytterbium-scandium double silicate solid solution ceramic material in environmental barrier coating materials.

[0045] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0046] The following examples were prepared using conventional instruments and equipment in the art. Experimental methods in the following examples, where specific conditions are not specified, were generally performed under conventional conditions or according to the conditions recommended by the manufacturer. The various raw materials used in the following examples, unless otherwise specified, were conventional commercially available products, with specifications conventional in the art. In the present specification and the following examples, unless otherwise specified, "%" indicates percentage by weight, "part" indicates parts by weight, and "ratio" indicates weight ratio.

[0047] Example 1

[0048] A method for preparing an ytterbium-scandium double silicate solid solution ceramic material comprises the following steps:

[0049] Step 1: The raw materials for the reaction are ytterbium oxide powder, scandium oxide powder and silicon dioxide powder with an original particle size of 400 mesh; weigh 15.3 g of ytterbium oxide powder, 16.1 g of scandium oxide powder and 18.6 g of silicon dioxide powder (the molar ratio conforms to the chemical formula Yb 0.5 Sc 1.5 Si2O7); then 10g of anhydrous ethanol was used as a medium, and the reaction raw materials were placed in a ball mill for 6h to form a mixed slurry;

[0050] Step 2: Dry and sieve the mixed slurry to obtain a mixed powder; perform pressureless sintering on the mixed powder in a muffle furnace. The pressureless sintering process is as follows: keep the mixture in an air medium at 1500°C for 10 hours and then cool it to room temperature (the particle size of the pure ytterbium-scandium double silicate solid solution ceramic powder material is 2.5μm), then place it in a ball mill, ball mill it in an alcohol medium for 6 hours, dry and sieve it, and then place the solid solution ceramic powder in a mold for dry pressing. The dry pressing pressure is 20Mpa and the dry pressing time is 5min. Then place it in a muffle furnace for pressureless sintering. The pressureless sintering process is as follows: keep the mixture in an air medium at 1500°C for 10 hours and then cool it to room temperature to obtain ytterbium-scandium double silicate solid solution ceramic material.

[0051] Example 2

[0052] A method for preparing an ytterbium-scandium double silicate solid solution ceramic material comprises the following steps:

[0053] Step 1: The raw materials for the reaction are ytterbium oxide powder, scandium oxide powder and silicon dioxide powder with an original particle size of 300 mesh; weigh 25.5 grams of ytterbium oxide powder, 8.9 grams of scandium oxide powder and 15.6 grams of silicon dioxide powder (the molar ratio conforms to the chemical formula Yb 1.0 Sc 1.0 Si2O7); then 10g of anhydrous ethanol was used as a medium, and the reaction raw materials were placed in a ball mill for 8h to form a mixed slurry;

[0054] Step 2: Dry and sieve the mixed slurry to obtain a mixed powder; perform pressureless sintering on the mixed powder in a muffle furnace. The pressureless sintering process is as follows: keep the mixture in an air medium at 1550°C for 12 hours and then cool it to room temperature (the particle size of the pure ytterbium-scandium double silicate solid solution ceramic powder material is 1 μm), then place it in a ball mill, and ball mill it in an alcohol medium for 8 hours. After drying and sieving, the solid solution ceramic powder is placed in a mold for dry pressing. The dry pressing pressure is 25 MPa and the dry pressing time is 4 minutes. Then, place it in a muffle furnace for pressureless sintering. The pressureless sintering process is as follows: keep the mixture in an air medium at 1550°C for 12 hours and then cool it to room temperature to obtain ytterbium-scandium double silicate solid solution ceramic material.

[0055] Example 3

[0056] A method for preparing an ytterbium-scandium double silicate solid solution ceramic material comprises the following steps:

[0057] Step 1: The raw materials for the reaction are ytterbium oxide powder, scandium oxide powder and silicon dioxide powder with an original particle size of 500 mesh; weigh 32.8 grams of ytterbium oxide powder, 3.8 grams of scandium oxide powder and 13.3 grams of silicon dioxide powder (the molar ratio conforms to the chemical formula Yb 1.5 Sc 0.5 Si2O7); then 10g of anhydrous ethanol was used as a medium, and the reaction raw materials were placed in a ball mill for 10h to form a mixed slurry;

[0058] Step 2: Dry and sieve the mixed slurry to obtain a mixed powder; perform pressureless sintering on the mixed powder in a muffle furnace. The pressureless sintering process is as follows: keep the mixture in an air medium at 1550°C for 10 hours and then cool it to room temperature (the particle size of the pure ytterbium-scandium double silicate solid solution ceramic powder material is 2μm), then place it in a ball mill, ball mill it in an alcohol medium for 10 hours, dry and sieve it, and then place the solid solution ceramic powder in a mold for dry pressing. The dry pressing pressure is 22Mpa and the dry pressing time is 5min. Then place it in a muffle furnace for pressureless sintering. The pressureless sintering process is as follows: keep the mixture in an air medium at 1550°C for 10 hours and then cool it to room temperature to obtain ytterbium-scandium double silicate solid solution ceramic material.

[0059] Comparative Example 1

[0060] The original particle size of the raw ytterbium oxide and silicon dioxide powders is 300 mesh. 30.7 grams of ytterbium oxide and 9.3 grams of silicon dioxide (molar ratio conforming to the chemical formula Yb2Si2O7) are used as raw materials. Yb2O3 powder (purity ≥99.9wt%) and SiO2 powder (purity ≥99.9wt%) are used as raw materials. With anhydrous ethanol as the medium, the powder is placed in a ball mill for 7 hours to form a slurry. The slurry is dried and sieved, and the resulting powder is pressurelessly sintered in a muffle furnace. The pressureless sintering process is as follows: the temperature is kept at 1550°C in air for 12 hours and then cooled to room temperature to obtain a pure ytterbium disilicate ceramic powder material with a particle size of 0.8μm.

[0061] The pressureless-sintered ytterbium disilicate ceramic powder was placed in a ball mill and milled in alcohol for 7 hours. After drying and passing through an 80-mesh sieve, the powder was dry-pressed in a mold at a pressure of 20 MPa for 3 minutes. Finally, the resulting ytterbium disilicate ceramic block was pressurelessly sintered in a muffle furnace. The pressureless sintering process involved holding the sintered ceramic block at 1550°C in air for 10 hours before cooling it to room temperature, resulting in a dense ytterbium disilicate ceramic block.

[0062] Figure 1The X-ray diffraction patterns of the ytterbium-scandium double silicate solid solution ceramic bulk materials prepared in Examples 1 to 3 of the present invention show that the solid solution materials do not undergo phase change in a high-temperature air atmosphere and have high-temperature phase stability.

[0063] Figure 2 The macroscopic morphology of the ytterbium-scandium double silicate solid solution ceramic bulk material prepared in Examples 1 to 3 of the present invention before and after being tested at 1500°C and 90% H2O-10% O2 for 100 hours shows no obvious change, indicating that the ceramic material has good resistance to water and oxygen corrosion.

[0064] Figure 3 SEM photographs of the ytterbium-scandium double silicate solid solution ceramic bulk material prepared in Examples 1 to 3 of the present invention before and after being tested at 1500°C and 90% H2O-10% O2 for 100 hours show that the grains gradually grew after the test, and the overall morphology did not change much, and no large-sized holes or cracks were found, indicating that the ceramic material has good resistance to water and oxygen corrosion.

[0065] Figure 4 The weight loss curves of the Yb-Sc double silicate solid solution ceramic block materials prepared in Examples 1 to 3 of the present invention and the pure Yb-Sc double silicate ceramic block materials prepared in Comparative Example 1 after 100 hours of testing at 1500°C and 90% H2O-10% O2 show that Yb 0.5 Sc 1.5 Si2O7 and Yb 1.0 Sc 1.0 The water-oxygen corrosion resistance of these two solid solutions of Si2O7 is better than that of Yb2Si2O7.

[0066] The ytterbium-scandium double silicate solid solution ceramic material disclosed in this invention can achieve precise control of material properties by adjusting the molar ratio of Yb to Sc (0 < x < 2). The introduction of Sc optimizes the material's crystal structure and thermophysical properties, while the addition of Yb helps improve the material's high-temperature stability and oxidation resistance. The ytterbium-scandium double silicate solid solution ceramic material exhibits excellent thermal and chemical stability at high temperatures, making it suitable for use in high-temperature environments of 1300-1500°C, meeting the requirements for environmental barrier coatings. The material also exhibits excellent oxidation and corrosion resistance in high-temperature oxidizing environments, effectively protecting the substrate material from damage caused by high-temperature oxidation and corrosion.

[0067] The preparation method of the ytterbium-scandium double silicate solid solution ceramic material disclosed in the present invention uses ytterbium oxide powder, scandium oxide powder and silicon dioxide powder with a purity of ≥99.9wt% as raw materials, ensuring the high purity and high performance of the material; the original particle size of the raw materials is 200-800 mesh, and after physical and mechanical treatment, the particle size of the final material is controlled to be 0.5-5μm, which is conducive to improving the density and sintering performance of the material; ethanol is used as a solvent, and the mass ratio of the reaction raw materials to the solvent is 5:1, which ensures the uniformity and stability of the mixed slurry; and the raw materials are further improved through post-processing steps such as drying, screening, and ball milling. The uniformity and activity of the material lay the foundation for the subsequent sintering process; the cold pressing molding in the dry pressing-pressureless sintering process is then adopted: cold pressing molding is carried out at a pressure of 15-25Mpa, and the holding time is 3-5min, which ensures the high density and uniformity of the material; pressureless sintering is carried out in normal pressure and air medium, the temperature is 1400-1600℃, and the holding time is 8-12h, which ensures the high-temperature sintering densification of the material and the optimization of the crystal structure; the ball milling method under alcohol medium is adopted, combined with drying and screening processes, and finally ceramic powder with uniform particle size is obtained, which further improves the sintering performance and mechanical properties of the material.

[0068] The present invention also discloses the application of the above-mentioned ytterbium-scandium double silicate solid solution ceramic material in environmental barrier coating materials. The material exhibits excellent performance in a high-temperature environment of 1300-1500°C, is suitable for environmental barrier coating materials, and can effectively protect the base material from damage by high-temperature oxidation, corrosion and thermal shock; by adjusting the ratio of Yb and Sc, the thermal expansion coefficient of the material can be optimized to better match it with the base material (such as a ceramic-based composite material or a high-temperature alloy), thereby reducing cracking and peeling of the coating caused by thermal stress; in a high-temperature oxidizing environment, the material can form a stable oxide layer, effectively preventing further diffusion of oxygen, thereby extending the service life of the base material; through the optimized preparation process, the material has a higher density and mechanical strength, and can withstand mechanical stress and thermal stress in a high-temperature environment.

[0069] The above content is only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A ytterbium-scandium double silicate solid solution ceramic material, characterized in that: The chemical formula of the ytterbium-scandium double silicate solid solution ceramic material is Yb x Sc (2-x) Si2O7; Wherein: x is the molar atomic weight of Sc replacing Yb; and 0<x<2.

2. The method for preparing the ytterbium-scandium double silicate solid solution ceramic material according to claim 1, characterized in that: The following steps are involved: According to the chemical formula of claim 1, ytterbium oxide powder, scandium oxide powder and silicon dioxide powder are weighed as reaction raw materials; Mixing the reaction raw materials with the solvent to obtain a mixed slurry; The mixed slurry is post-processed to obtain mixed powder; the mixed powder is sequentially subjected to pressureless sintering and dry pressing-pressureless sintering to obtain ytterbium-scandium double silicate solid solution ceramic material.

3. The method for preparing a ytterbium-scandium double silicate solid solution ceramic material according to claim 2, characterized in that: The purity of the ytterbium oxide powder, the scandium oxide powder and the silicon dioxide powder is greater than or equal to 99.9 wt %, and the original particle size is 200-800 meshes.

4. The method for preparing a ytterbium-scandium double silicate solid solution ceramic material according to claim 2, characterized in that: The solvent is ethanol; the mass ratio of the reaction raw materials to the solvent is 5:

1.

5. The method for preparing a ytterbium-scandium double silicate solid solution ceramic material according to claim 2, characterized in that: The post-processing includes drying and screening performed in sequence; The process steps of the dry pressing-pressureless sintering treatment are: performing pressureless sintering on the mixed powder and then performing physical and mechanical treatment, placing it in a mold for cold pressing to obtain an ytterbium-scandium double silicate solid solution ceramic block material; then placing the ytterbium-scandium double silicate solid solution ceramic block material in a heat treatment device for pressureless sintering to obtain an ytterbium-scandium double silicate solid solution ceramic material.

6. The method for preparing the ytterbium-scandium double silicate solid solution ceramic material according to claim 5, characterized in that: The pressure of the cold pressing is 15-25 MPa, and the holding time is 3-5 minutes.

7. The method for preparing the ytterbium-scandium double silicate solid solution ceramic material according to claim 5, characterized in that: The pressureless sintering is carried out in normal pressure and air medium; the temperature of the pressureless sintering is 1400-1600° C., and the holding time is 8-12 hours.

8. The method for preparing the ytterbium-scandium double silicate solid solution ceramic material according to claim 5, characterized in that: The physical and mechanical treatment is a ball milling method in an alcohol medium, followed by drying and sieving to obtain an ytterbium-scandium double silicate solid solution ceramic material with a particle size of 0.5 to 5 μm.

9. Use of the ytterbium-scandium double silicate solid solution ceramic material according to claim 1 in an environmental barrier coating material.

10. The use of the ytterbium-scandium double silicate solid solution ceramic material in an environmental barrier coating material according to claim 9, characterized in that: The operating temperature of the environmental barrier coating material is 1300-1500°C.

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