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Superhigh temperature resistant ceramic matrix composite material with self-healing ability and preparation method thereof

A composite material and ceramic-based technology, applied in the field of ceramic-based composite materials and their preparation, can solve the problems of damaged interface and fiber, material performance degradation, etc., and achieve the effect of increasing the degree of densification, good oxidation resistance, and improving mechanical properties

Active Publication Date: 2017-07-21
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for silicon-based materials, SiC will be oxidized at 1600°C, which will degrade the performance of the material; 3 N 4 Thermal decomposition will occur at 1400°C, and for SiC ceramic matrix composites, the prepared composites will inevitably have cracks and holes, which will cause the oxidizing medium to directly act on the interior of the material, damaging the interface and fiber, leading to a decrease in the performance of the material, limiting the further application of these high temperature resistant composites

Method used

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preparation example Construction

[0025] The invention provides a method for preparing a continuous fiber reinforced ceramic matrix composite material, which is characterized in that it comprises the following steps:

[0026] S1: SiBNC fiber preform is prepared by chemical vapor deposition method to prepare SiC interface, and SiBNC fiber preform containing interfacial phase is obtained; SiBNC fiber preform is prepared by three-dimensional four-way weaving method; in chemical vapor deposition method: trichloride Methylsilane is the reaction gas, hydrogen is the carrier gas, argon is the diluent gas, the deposition temperature is 1000-1200°C, the pressure is 20-50Pa; the volume ratio of trichloromethylsilane to hydrogen is 1:10-1:15 , The deposition time is 8 ~ 15h.

[0027] S2: The SiBNC fiber preform containing the interface phase is densified by the precursor impregnation cracking method; the precursor impregnation cracking method includes: under vacuum conditions, the SiBNC fiber preform containing the inter...

Embodiment 1

[0031]The SiBNC fiber prefabricated body was prepared by three-dimensional four-way weaving method, and then placed in a chemical vapor deposition furnace. Gas is the dilution gas, and hydrogen is used as the carrier gas. Trichloromethylsilane is brought into the chemical vapor deposition furnace by bubbling to prepare the SiC interface. The deposition time is 9h, and the volume ratio of hydrogen to trichloromethylsilane is 10 :1.

[0032] The obtained SiBNC fiber preform with an interfacial phase is densified by a precursor dipping cracking method: under vacuum conditions, the obtained SiBNC fiber preform with an interfacial phase is immersed in a mixed solution of polyborosilazane and toluene , wherein the mass fraction of polyborosilazane in the mixed solution of polyborosilazane and toluene is 30%, and impregnated for 5 hours; the impregnated product is placed in a tube furnace for cross-linking, and the cross-linking temperature is 230°C. The time for linking is 3h; then...

Embodiment 2

[0035] The SiBNC fiber prefabricated body was prepared by the three-dimensional four-way weaving method, and then placed in a chemical vapor deposition furnace. The gas is the dilution gas, and hydrogen is used as the carrier gas. Trichloromethylsilane is brought into the chemical vapor deposition furnace by bubbling to prepare the SiC interface. The deposition time is 15h, and the volume ratio of hydrogen to trichloromethylsilane is 15. :1.

[0036] The obtained SiBNC fiber preform with an interfacial phase is densified by a precursor dipping cracking method: under vacuum conditions, the obtained SiBNC fiber preform with an interfacial phase is immersed in a mixed solution of polyborosilazane and toluene , wherein the mass fraction of polyborosilazane in the mixed solution of polyborosilazane and toluene is 50%, and impregnated for 3 hours; the impregnated product is placed in a tube furnace for cross-linking, and the cross-linking temperature is 150 ° C. The time for linkin...

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Abstract

The invention relates to a superhigh temperature resistant ceramic matrix composite material with self-healing ability and a preparation method thereof. The preparation method comprises the steps of: using an SiBNC fiber preform to prepare an SiC interface by chemical vapor deposition, thus obtaining an SiBNC fiber preform containing an interphase, wherein the reaction gas of the chemical vapor deposition is trichloromethylsilane; taking a mixed solution of polyborosilazane and toluene as a precursor solution, and densifying the SiBNC fiber preform containing the interphase by means of precursor impregnation pyrolysis; and further conducting densification by precursor impregnation pyrolysis repeatedly, thus obtaining the continuous fiber reinforced ceramic matrix composite material. The continuous fiber reinforced ceramic matrix composite material provided by the invention can improve the high-temperature resistance of the composite material up to 1900DEG C, and has self-healing ability in a high temperature oxidation environment, the preparation method is simple and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a ceramic matrix composite material with ultrahigh temperature resistance and self-healing ability and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of aerospace and other fields, people have put forward higher and higher requirements for the high temperature resistance of materials. The high temperature resistant composite materials currently used mainly include silicon-based composite materials, C / C composite materials and metal composite materials. and its compounds. C / C composite materials will be eroded by burning solid particles and water vapor under high temperature and oxygen environment, and will fail due to oxidation; the application of metal materials will be limited by the melting temperature; silicon-based composite materials have high temperature resistance and chemical stability. Good and other ...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/515C04B35/622C04B35/628
CPCC04B35/515C04B35/622C04B35/62863C04B35/806C04B2235/483C04B2235/486C04B2235/524C04B2235/5252C04B2235/616C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/658C04B2235/77C04B2235/96C04B2235/9607
Inventor 罗瑞盈崔光远
Owner BEIHANG UNIV
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