SiC-BN multiphase ceramic matrix composite material and preparation method thereof

Abstract

The invention provides a SiC-BN multiphase ceramic-based composite material and a preparation method thereof.The SiC-BN multiphase ceramic-based composite material is prepared from, by mass, 40%-53% of a fiber reinforced material, 40%-50% of a SiC matrix and 5%-10% of a BN matrix; the mass content of B in the BN matrix is 2%-30%. The SiC-BN composite ceramic matrix composite material prepared by the method has the characteristics of high compactness, high temperature resistance, ablation resistance and the like, and has excellent application value in the field of novel high-performance thermal protection composite materials.

Description

Technical Field

[0001] The present invention belongs to the field of novel high temperature resistant heat protection composite materials, and specifically relates to a SiC-BN multiphase ceramic matrix composite material and a preparation method thereof. Background Art

[0002] High-temperature resistant thermal protection materials have very extensive and important applications in aerospace, energy, information and other fields. The continuous development and transformation of high-tech has put forward higher requirements for the high-temperature resistance, light weight, oxidation resistance and high reliability of thermal protection system materials. Traditional resin-based composite materials and metal materials can hardly meet this demand. Ceramic-based composite materials (CMCs), as a high-temperature resistant thermal protection material, can be used in more severe and harsh environments, thus becoming an ideal material for product components to replace resin-based composite materials and metal materials.

[0003] SiC and BN ceramics are among the most widely used carbide and nitride matrices in the field of thermal protection materials. SiC has excellent properties such as high modulus, high strength, high temperature resistance, and low density; BN has excellent electromagnetic wave transmission, high temperature resistance, and low linear expansion. The maximum temperature resistance of pure β-SiC crystals can reach over 2600°C. However, the high temperature resistance of SiC ceramics is far from this theoretical temperature; the preparation process of BN ceramics usually adopts the precursor impregnation pyrolysis method (PIP), and the product density increases quickly and high, which requires relatively high equipment capacity and needs to withstand high pressure.

[0004] The Chinese patent with publication number CN116143534A discloses a method for preparing a hybrid polycarbosilane reinforced silicon carbide ceramic matrix composite material, which uses solid polycarbosilane and liquid polycarbosilane as the silicon carbide matrix, and a carbon fiber preform as the reinforcement phase, and prepares a carbon fiber reinforced silicon carbide composite material with low porosity through an impregnation-electron beam radiation-sintering process; the Chinese patent with publication number CN102795871A discloses a method for rapidly preparing a C / SiC ceramic matrix composite material, which uses liquid polycarbosilane as the matrix, carbon fiber as the reinforcement, and uses a pulsed heated chemical liquid vapor deposition process to prepare a C / SiC ceramic matrix composite material. However, the ablation performance of the composite material cannot meet the requirements of components in the current aerospace and other fields. To improve the ablation performance of carbon fiber reinforced silicon carbide composites, elements such as zirconium (Zr), hafnium (Hf), and boron (B) can be introduced. However, the raw materials of zirconium (Zr) and hafnium (Hf) are expensive and cannot meet the needs of mass production. However, the raw materials of boron (B) are relatively cheap and can also be industrialized, providing a basis for improving the ablation performance of carbon fiber reinforced silicon carbide composites.

[0005] Therefore, there is an urgent need to develop a high temperature resistant ceramic-based composite material to meet the demand. Summary of the invention

[0006] The technical problem solved by the present invention is to provide a SiC-BN multiphase ceramic matrix composite material and a preparation method thereof, in order to solve the shortcomings of the existing carbon fiber reinforced silicon carbide composite materials such as low densification, low high temperature resistance, low ablation resistance, etc.

[0007] In order to solve the above problems, the first aspect of the present invention provides a SiC-BN multiphase ceramic matrix composite material, which includes the following raw materials in mass percentage: Fiber reinforcement 40%~53%, SiC matrix 40%~50% and BN matrix 5%~10%; The mass content of B in the BN matrix is ​​2%-30%.

[0008] Preferably, the fiber reinforcement material is carbon fiber.

[0009] A second aspect of the present invention provides a method for preparing the SiC-BN multiphase ceramic matrix composite material as described above, comprising the following steps: S1: Provide fiber reinforcement materials; S2: impregnating the fiber reinforcement material with a SiC precursor solution, followed by curing, sintering, and cyclic densification to obtain an intermediate; S3: impregnating the intermediate with a borazine solution, and then curing and sintering to obtain the SiC-BN multiphase ceramic matrix composite material.

[0010] Preferably, step S1 specifically includes the following steps: weaving the preform using one of the weaving methods of fine weaving puncture, needle suture, 2.5D, and three-way orthogonal weaving; and heat treating the fiber reinforced material at 300-1500° C. for 2-12 hours.

[0011] Preferably, in step S2, the impregnation of the fiber reinforcement material with the SiC precursor solution specifically includes the following steps: placing the reinforcement material obtained in S1 in a closed container, vacuuming the container for 1 to 2 hours, and then sucking the silicon carbide precursor solution into the closed container.

[0012] Preferably, in step S2, the curing includes the following steps: transferring the fiber-reinforced material impregnated with the SiC precursor solution into a curing container, and maintaining it at 25°C to 400°C and 1 to 10 MPa for 2 to 20 hours to obtain a first composite material rough blank.

[0013] Preferably, in step S2, the sintering includes the following steps: sintering the first composite material blank at 800~2000°C for 2~10 hours; in step S2, the cyclic densification includes the following steps: repeatedly impregnating, curing and sintering the sintered first composite material blank for 5~10 times to obtain an intermediate.

[0014] Preferably, in step S3, the impregnation of the intermediate with the borazine solution comprises the following steps: placing the intermediate in a sealed container, vacuuming the sealed container for 1 to 2 hours to exhaust the air in the intermediate, and then sucking the borazine solution into the sealed container.

[0015] Preferably, in step S3, the curing includes the following steps: transferring the intermediate impregnated with the borazine solution into a curing container, first heating it to 30-50°C, keeping it warm for 10-40 hours, then heating it to 60-80°C, keeping it warm for 8-30 hours, and then heating it to 80-100°C, keeping it warm for 5-20 hours, the atmosphere is an inert gas, and the pressure is 1-10 MPa to obtain a second composite material rough blank.

[0016] Preferably, in step S3, the curing includes the following steps: sintering the second composite material blank at 800~2000°C for 2~10 hours; in step S3, the cyclic densification includes the following steps: repeating the steps of impregnation, curing and sintering the sintered second composite material blank for 2~8 times to obtain a SiC-BN composite ceramic matrix composite material.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The SiC-BN composite ceramic matrix composite material of the present invention is a carbon fiber preform that is woven by one of the weaving methods such as fine weaving puncture, needle suturing, 2.5D, and three-way orthogonal weaving, and the preform is heat treated in a high temperature environment, and then the carbon fiber preform is impregnated with a silicon carbide precursor solution for multiple times, solidified, and sintered to obtain an intermediate, and the intermediate is impregnated with a borazine solution for multiple times, solidified, and sintered to obtain the SiC-BN composite ceramic matrix composite material. The SiC-BN composite ceramic matrix composite material has the characteristics of high densification, high temperature resistance, ablation resistance, etc., and has excellent application value in the field of new high-performance thermal protection composite materials. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solution of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] A first aspect of an embodiment of the present invention provides a SiC-BN multiphase ceramic matrix composite material, which includes the following raw materials in percentage by mass: Fiber reinforcement 40%~53%, SiC matrix 40%~50% and BN matrix 5%~10%; The mass content of B in the BN matrix is ​​2%-30%.

[0020] The SiC-BN composite ceramic matrix composite material of the embodiment of the present invention is woven into a carbon fiber preform by one of the weaving methods such as fine weaving puncture, needle suture, 2.5D, or three-way orthogonal weaving, and the preform is heat treated in a high temperature environment, and then the carbon fiber preform is impregnated with a silicon carbide precursor solution for multiple times, solidified, and sintered to obtain an intermediate, and the intermediate is impregnated with a borazine solution for multiple times, solidified, and sintered to obtain the SiC-BN composite ceramic matrix composite material. The SiC-BN composite ceramic matrix composite material has the characteristics of high densification, high temperature resistance, ablation resistance, etc., and has excellent application value in the field of new high-performance thermal protection composite materials.

[0021] SiC ceramics have excellent specific strength, specific stiffness, high hardness and wear resistance. They also have excellent properties such as high operating temperature, large thermal conductivity, small thermal expansion coefficient, and strong antioxidant ability. They have excellent temperature resistance potential and are good high-temperature structural ceramics for use within 1900°C. Pure β-SiC crystals can withstand high temperatures of up to 2600°C. However, the high temperature resistance of SiC ceramics is far from this theoretical temperature. When the temperature reaches above 1400°C, β-SiC microcrystals continuously obtain new supplements from the continuous phase, causing the grains to grow rapidly and the mechanical properties to significantly decrease; the BN ceramic matrix is ​​a type of strong covalent bond compound with excellent high temperature resistance, oxidation resistance, chemical corrosion resistance, and ablation resistance. Its decomposition temperature is as high as 3000°C; However, the SiC-BN composite ceramic matrix forms a strong covalent bond amorphous network structure and its uniform distribution, which makes it have the characteristics of high temperature resistance up to about 2200℃ and good thermal stability; the oxidation rate control link of the composite ceramic matrix is ​​mainly the interface reaction, forming a double oxide layer, the outer layer is SiO2, and the inner layer is B2O3, among which B2O3 can further reduce the transmittance of O2 and improve the oxidation resistance of the ceramic; the high temperature stability of the composite ceramic matrix is ​​directly related to its B content, because B can effectively inhibit the transformation of Si3N4 and SiC from amorphous to crystalline at high temperature, and the addition of B element can effectively inhibit the crystallization and decomposition of Si3N4, thereby improving the ceramic heat resistance of the composite ceramic matrix. The high temperature stability of the composite ceramic matrix is ​​related to the B content. With the increase of B content, the temperature resistance of the composite ceramic matrix also increases; when the B content is 5.9%, the decomposition temperature of the composite ceramic matrix is ​​as high as about 2000℃. In some embodiments, the fiber reinforcement material is carbon fiber.

[0022] A second aspect of an embodiment of the present invention provides a method for preparing the SiC-BN multiphase ceramic matrix composite material as described above, comprising the following steps: S1: Provide fiber reinforcement materials; S2: impregnating the fiber reinforcement material with a SiC precursor solution, followed by curing, sintering, and cyclic densification to obtain an intermediate; S3: impregnating the intermediate with a borazine solution, and then curing and sintering to obtain the SiC-BN multiphase ceramic matrix composite material.

[0023] In some embodiments, the viscosity of the SiC precursor is 40-60×10 -3 , the viscosity of BN precursor is 1~5×10 -3 , SiC needs to be impregnated first, and then BN. This will increase the density of the material and thus improve the mechanical properties of the material; impregnation of BN enters the pores of the material and will form a SiBCN ceramic matrix after sintering.

[0024] In some embodiments, step S1 specifically includes the following steps: weaving the preform using one of the weaving methods of fine weaving puncture, needle suture, 2.5D, and three-way orthogonal weaving; heat treating the fiber reinforced material at 300~1500℃ for 2~12h.

[0025] In some embodiments, in step S2, the impregnation of the fiber reinforcement material with the SiC precursor solution specifically includes the following steps: placing the reinforcement material obtained in S1 in a closed container, vacuuming the container for 1 to 2 hours, and then sucking the silicon carbide precursor solution into the closed container.

[0026] In some embodiments, in step S2, the curing includes the following steps: transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, and maintaining it at 25°C to 400°C and 1 to 10 MPa for 2 to 20 hours to obtain a first composite material rough blank.

[0027] In some embodiments, in step S2, the sintering includes the following steps: sintering the first composite material blank at 800~2000°C for 2~10 hours; in step S2, the cyclic densification includes the following steps: repeatedly impregnating, curing and sintering the sintered first composite material blank for 5~10 times to obtain an intermediate.

[0028] In some embodiments, in step S3, the impregnation of the intermediate with the borazine solution includes the following steps: placing the intermediate in a sealed container, vacuuming the sealed container for 1 to 2 hours to exhaust the air in the intermediate, and then sucking the borazine solution into the sealed container.

[0029] In some embodiments, in step S3, the curing includes the following steps: transferring the intermediate impregnated with the cycloborazine solution to a curing container, first heating it to 30-50°C, keeping it warm for 10-40 hours, then heating it to 60-80°C, keeping it warm for 8-30 hours, and then heating it to 80-100°C, keeping it warm for 5-20 hours, the atmosphere is an inert gas, and the pressure is 1-10 MPa to obtain a second composite material rough blank.

[0030] In some embodiments, in step S3, the curing includes the following steps: sintering the second composite material blank at 800~2000°C for 2~10 hours; in step S3, the cyclic densification includes the following steps: repeating the steps of impregnation, curing, and sintering the sintered second composite material blank for 2~8 times to obtain a SiC-BN composite ceramic matrix composite material.

[0031] Example 1 The SiC-BN multiphase ceramic matrix composite material of this embodiment includes the following raw materials in percentage by mass: 50% fiber reinforcement material, 40% SiC matrix and 10% BN matrix; the content of B in the BN matrix is ​​5.9%.

[0032] The preparation method of the SiC-BN multiphase ceramic matrix composite material of this embodiment comprises the following steps: S1: heat treating the fiber reinforced material at 1200°C for 3h; S2: impregnating the fiber-reinforced material with a SiC precursor solution, then transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, and maintaining the container at 300° C. and 3 MPa for 8 hours to obtain a first composite rough blank; sintering the first composite rough blank at 1200° C. for 5 hours; and repeating the impregnation, curing, and sintering of the sintered first composite rough blank for 6 times to obtain an intermediate; S3: The intermediate is impregnated with a borazine solution, and then the intermediate impregnated with the borazine solution is transferred to a curing container, first heated to 40°C, kept warm for 40 hours, then heated to 70°C, kept warm for 30 hours, and then heated to 90°C, kept warm for 20 hours, the atmosphere is an inert gas, and the pressure is 5.5 MPa, to obtain a second composite material rough billet; the second composite material rough billet is kept at 1200°C for 5 hours and sintered; the steps of impregnation, curing and sintering of the sintered second composite material rough billet are repeated 5 times to obtain a SiC-BN composite ceramic matrix composite material.

[0033] Example 2 The SiC-BN multiphase ceramic matrix composite material of this embodiment includes the following raw materials in percentage by mass: 45% of fiber reinforcement material, 50% of SiC matrix and 5% of BN matrix; the content of B in the BN matrix is ​​7%.

[0034] The preparation method of the SiC-BN multiphase ceramic matrix composite material of this embodiment comprises the following steps: S1: heat treating the fiber reinforced material at 900 °C for 4 h; S2: impregnating the fiber-reinforced material with a SiC precursor solution, then transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, maintaining it at 350°C and 5MPa for 5 hours, to obtain a first composite rough blank; sintering the first composite rough blank at 1250°C for 4 hours; repeating the impregnation, curing, and sintering of the sintered first composite rough blank 5 times to obtain an intermediate; S3: The intermediate is impregnated with a borazine solution, and then the intermediate impregnated with the borazine solution is transferred to a curing container, first heated to 35°C, kept warm for 30 hours, then heated to 75°C, kept warm for 25 hours, and then heated to 95°C, kept warm for 15 hours, the atmosphere is an inert gas, and the pressure is 6 MPa, to obtain a second composite material rough billet; the second composite material rough billet is kept at 1250°C for 4 hours and sintered; the steps of impregnation, curing and sintering are repeated for 6 times on the sintered second composite material rough billet to obtain a SiC-BN composite ceramic matrix composite material.

[0035] Example 3 The SiC-BN multiphase ceramic matrix composite material of this embodiment includes the following raw materials in percentage by mass: 47% of fiber reinforcement material, 45% of SiC matrix and 8% of BN matrix; the content of B in the BN matrix is ​​4%.

[0036] The preparation method of the SiC-BN multiphase ceramic matrix composite material of this embodiment comprises the following steps: S1: heat treating the fiber reinforced material at 1100°C for 3.5h; S2: impregnating the fiber-reinforced material with a SiC precursor solution, then transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, and maintaining it at 200°C and 2MPa for 15 hours to obtain a first composite rough blank; sintering the first composite rough blank at 1100°C for 7 hours; and repeating the impregnation, curing, and sintering of the sintered first composite rough blank for 7 times to obtain an intermediate; S3: The intermediate is impregnated with a borazine solution, and then the intermediate impregnated with the borazine solution is transferred to a curing container, first heated to 40°C, kept warm for 30 hours, then heated to 70°C, kept warm for 25 hours, and then heated to 90°C, kept warm for 15 hours, the atmosphere is an inert gas, and the pressure is 6 MPa, to obtain a second composite material rough billet; the second composite material rough billet is kept warm for 4 hours at 1250°C; the sintered second composite material rough billet is repeated for 4 times for impregnation, curing, and sintering, to obtain a SiC-BN composite ceramic matrix composite material.

[0037] Example 4 The SiC-BN multiphase ceramic matrix composite material of this embodiment includes the following raw materials in percentage by mass: 50% fiber reinforcement material, 35% SiC matrix and 15% BN matrix; the content of B in the BN matrix is ​​2%.

[0038] The preparation method of the SiC-BN multiphase ceramic matrix composite material of this embodiment comprises the following steps: S1: heat treating the fiber reinforced material at 1000°C for 3h; S2: impregnating the fiber-reinforced material with a SiC precursor solution, then transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, and maintaining the container at 400° C. and 5.5 MPa for 4 hours to obtain a first composite rough blank; sintering the first composite rough blank at 1300° C. for 4 hours; and repeating the impregnation, curing, and sintering of the sintered first composite rough blank for 4 times to obtain an intermediate; S3: The intermediate is impregnated with a borazine solution, and then the intermediate impregnated with the borazine solution is transferred to a curing container, first heated to 35°C, kept warm for 40 hours, then heated to 75°C, kept warm for 30 hours, and then heated to 95°C, kept warm for 20 hours, the atmosphere is an inert gas, and the pressure is 5.5 MPa, to obtain a second composite material rough billet; the second composite material rough billet is kept at 1200°C for 5 hours and sintered; the steps of impregnation, curing and sintering are repeated for 7 times on the sintered second composite material rough billet to obtain a SiC-BN composite ceramic matrix composite material.

[0039] Example 5 The SiC-BN multiphase ceramic matrix composite material of this embodiment includes the following raw materials in percentage by mass: 43% of fiber reinforcement material, 55% of SiC matrix and 2% of BN matrix; the content of B in the BN matrix is ​​2%.

[0040] The preparation method of the SiC-BN multiphase ceramic matrix composite material of this embodiment comprises the following steps: S1: heat treating the fiber reinforced material at 1300°C for 2h; S2: impregnating the fiber-reinforced material with a SiC precursor solution, then transferring the fiber-reinforced material impregnated with the SiC precursor solution to a curing container, and maintaining the first composite rough blank at 250° C. and 2.5 MPa for 20 hours; sintering the first composite rough blank at 1400° C. for 3 hours; and repeating the impregnation, curing, and sintering of the sintered first composite rough blank 8 times to obtain an intermediate; S3: The intermediate is impregnated with a borazine solution, and then the intermediate impregnated with the borazine solution is transferred to a curing container, first heated to 30°C, kept warm for 40 hours, then heated to 65°C, kept warm for 30 hours, and then heated to 85°C, kept warm for 20 hours, the atmosphere is an inert gas, and the pressure is 5 MPa, to obtain a second composite material rough billet; the second composite material rough billet is kept at 1300°C for 3 hours and sintered; the steps of impregnation, curing and sintering are repeated for 3 times on the sintered second composite material rough billet to obtain a SiC-BN composite ceramic matrix composite material.

[0041] Comparative Example 1 The difference between this comparative example and Example 1 is that only SiC substrate is used, and the rest is the same as Example 1.

[0042] Comparative Example 2 The difference between this comparative example and Example 1 is that only BN is used as a matrix, and the rest is the same as Example 1.

[0043] Comparative Example 3 The difference between this comparative example and Example 1 is that BN is impregnated first and then SiC is impregnated, and the rest is the same as Example 1.

[0044] The density, ablation performance and bending strength of the SiC-BN composite ceramic matrix composite materials obtained in the above-mentioned embodiments and comparative examples were measured, and the test results are shown in Table 1 below. In comparative example 1, no BN matrix was added. Although the obtained composite material has good temperature resistance, it is far from reaching the theoretical temperature. When the temperature reaches above 1400°C, the β-SiC microcrystals continuously obtain new supplements from the continuous phase, causing the grains to grow rapidly and the mechanical properties to decrease significantly. In comparative example 3, the order of impregnation was changed. Such an operation would cause the density of the material to fail to reach the theoretical height, thereby affecting the mechanical properties of the material. Judging from the test results of embodiments 1-5 and comparative examples 1-3, by comparison, the products obtained in each embodiment have the characteristics of high densification, high temperature resistance, ablation resistance, etc. compared with the comparative examples, and have excellent application value in the field of new high-performance thermal protection composite materials.

[0045] Table 1 Performance test of SiC-BN composite ceramic matrix composite materials of various embodiments and comparative examples

[0046] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A SiC-BN multiphase ceramic matrix composite material, characterized in that: It includes the following raw materials in percentage by weight: Fiber reinforcement 40%~53%, SiC matrix 40%~50% and BN matrix 5%~10%; The mass content of B in the BN matrix is ​​2%-30%.

2. The SiC-BN multiphase ceramic matrix composite material according to claim 1, characterized in that: The fiber reinforcement material is carbon fiber.

3. A method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 1 or 2, characterized in that: The steps include: S1: Provide fiber reinforcement materials; S2: impregnating the fiber reinforcement material with a SiC precursor solution, followed by curing, sintering, and cyclic densification to obtain an intermediate; S3: impregnating the intermediate with a borazine solution, and then curing and sintering to obtain the SiC-BN multiphase ceramic matrix composite material.

4. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 3, characterized in that: Step S1 specifically includes the following steps: weaving a preform using one of the weaving methods of fine weaving puncture, needle suture, 2.5D, and three-way orthogonal weaving; and heat treating the fiber reinforced material at 300-1500° C. for 2-12 hours.

5. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 3, characterized in that: In step S2, the SiC precursor solution is used to impregnate the fiber-reinforced material. The method comprises the following steps: placing the reinforcement material obtained in S1 in a sealed container, vacuumizing the container for 1 to 2 hours, and then sucking the silicon carbide precursor solution into the sealed container.

6. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 3, characterized in that: In step S2, the curing includes the following steps: transferring the fiber-reinforced material impregnated with the SiC precursor solution into a curing container, and maintaining the container at 25°C to 400°C and 1 to 10 MPa for 2 to 20 hours to obtain a first composite material rough blank.

7. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 6, characterized in that: In step S2, the sintering comprises the following steps: sintering the first composite material blank at 800-2000° C. for 2-10 hours; In step S2, the cyclic densification includes the following steps: repeatedly impregnating, curing and sintering the sintered first composite material blank for 5 to 10 times to obtain an intermediate.

8. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 3, characterized in that: In step S3, the impregnation of the intermediate with the borazine solution includes the following steps: placing the intermediate in a sealed container, vacuuming the sealed container for 1 to 2 hours to exhaust the air in the intermediate, and then sucking the borazine solution into the sealed container.

9. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 3, characterized in that: In step S3, the curing includes the following steps: transferring the intermediate impregnated with the cycloborazine solution into a curing container, first heating it to 30-50°C, keeping it warm for 10-40 hours, then heating it to 60-80°C, keeping it warm for 8-30 hours, and then heating it to 80-100°C, keeping it warm for 5-20 hours, the atmosphere is an inert gas, and the pressure is 1-10 MPa to obtain a second composite material rough blank.

10. The method for preparing the SiC-BN multiphase ceramic matrix composite material according to claim 9, characterized in that: In step S3, the curing comprises the following steps: sintering the second composite material blank at 800-2000° C. for 2-10 hours; In step S3, the cyclic densification includes the following steps: repeating the steps of impregnation, curing and sintering 2 to 8 times on the sintered second composite material blank to obtain a SiC-BN multiphase ceramic matrix composite material.

Images