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SiCf/SiC ceramic-based composite material with composite interface and preparation method of SiCf/SiC ceramic-based composite material

A composite material and ceramic matrix technology, which is applied in the field of SiCf/SiC ceramic matrix composite material and its preparation, can solve the problems of incapable of deflecting cracks, limited phase transformation toughening, and low use temperature of BN interface, so as to improve the oxidation resistance. Ability, toughening effect, high temperature effect

Inactive Publication Date: 2019-04-02
SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the BN interface, ZrO 2 The interface can improve the oxidation resistance of the composite material to a certain extent, but the use temperature of the pure BN interface is still low, and the pure ZrO 2 Interfacial phase transformation toughening is limited and cannot play the role of deflecting cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Has (BN / SiC) n SiC at composite interface f / SiC Ceramic Matrix Composites

[0026] (1) Weave silicon carbide fibers into fiber prefabricated body, heat treatment in argon atmosphere at 900℃ for 1h;

[0027] (2) With propylene as the carbon source, argon as the protective gas, the deposition temperature was 900°C, and the deposition time was 3 hours, a pyrolytic carbon coating was prepared on the surface of the fiber by chemical vapor deposition;

[0028] (3) The BN interface was prepared by impregnation-coating method. Boric acid and urea were used as the boron source and nitrogen source of the impregnation-coating method, and sodium tetraborate was used as an additive. Boric acid and urea were dissolved in ethanol at a mass fraction ratio of 1:2. In the process, make a boric acid-urea ethanol solution, then add sodium tetraborate with a mass fraction of 3% to obtain a sodium tetraborate-boric acid-urea ethanol solution, and use the sodium tetraborate-boric acid-urea...

Embodiment 2

[0036] With (ZrO 2 / SiC) n SiC at composite interface f / SiC Ceramic Matrix Composites

[0037] ((1) Weave silicon carbide fibers into fiber prefabricated bodies and heat treat them in an argon atmosphere at 900°C for 1 hour;

[0038] (2) With propylene as the carbon source, argon as the protective gas, the deposition temperature was 900°C, and the deposition time was 3 hours, a pyrolytic carbon coating was prepared on the surface of the fiber by chemical vapor deposition;

[0039] (3) Preparation of ZrO by sol-gel method 2 Interface, yttrium nitrate hexahydrate and zirconium oxychloride octahydrate are dissolved in deionized water at a molar ratio of 1:32, ammonia water is added to adjust the pH to 12, and a white zirconia gel is formed, and the zirconia gel is washed with deionized water to remove impurity ions , then drop dilute nitric acid to adjust the pH to 2, the white zirconia gel turns into a white zirconia sol, stir at 80°C for 24 hours, the white zirconia sol tu...

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Abstract

The invention discloses a SiCf / SiC ceramic-based composite material with a composite interface. The SiCf / SiC ceramic-based composite material with the composite interface has the characteristic of comprising a CVD-SiC coating, a PIP-SiC matrix, the composite interface and SiC fiber, wherein the CVD-SiC coating is a silicon carbide coating which is prepared by using a chemical vapor deposition method and has a thickness of 100-500 [mu]m, the composite interface is formed through alternate cyclic overlapping of arbitrary two or three of a BN interface, a ZrO2 interface, a LaPO4 interface and a SiC interface, and the cyclic number is 3-5 times; and the PIP-SiC matrix is silicon carbide formed through in-situ pyrolysis of polycarbosilane, the volume of the SiC fiber accounts for 40-60% of thevolume of the composite material, and a pyrolytic carbon layer of 5-20 nm thick is formed on the surface. The preparation method comprises the steps: preparing the multi-layer composite interface on the surface of the silicon carbide fiber by using different preparation processes, then filling a SiC matrix by using a PIP method, and finally preparing a surface SiC coating by using a CVD method. The prepared SiCf / SiC ceramic-based composite material has high toughness, high oxidation resistance and a simple preparation process.

Description

technical field [0001] The invention relates to a ceramic matrix composite material and a preparation method thereof, in particular to a SiC composite interface f / SiC ceramic matrix composite material and preparation method thereof. Background technique [0002] SiC ceramics have the potential to replace metals as a new generation of high-temperature structural materials because of their excellent properties such as high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance and corrosion resistance. In addition, due to its excellent semiconductor characteristics and relatively stable dielectric properties at high temperatures, SiC also has a good application prospect in microwave absorbing materials. However, due to the low fracture toughness of SiC single material, which manifests as brittle fracture, its application is limited. At present, it has been gradually adopted by SiC f / SiC composite material replaced. Contin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622
CPCC04B35/806C04B35/565C04B35/622C04B2235/3244C04B2235/386C04B2235/9684
Inventor 余盛杰其他发明人请求不公开姓名
Owner SUZHOU HONGJIU AVIATION THERMAL MATERIALS TECH CO LTD
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