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High-toughness C/ultrahigh-temperature ceramic composite material and preparation method thereof

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of preparation of ultra-high temperature ceramic matrix composite materials, can solve problems such as poor toughness, achieve the effect of expanding interlayer spacing and improving mechanical properties

Active Publication Date: 2021-11-02
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is the problem of poor toughness of the ultra-high temperature ceramic matrix under the existing technical conditions

Method used

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  • High-toughness C/ultrahigh-temperature ceramic composite material and preparation method thereof
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  • High-toughness C/ultrahigh-temperature ceramic composite material and preparation method thereof

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preparation example Construction

[0023] The first aspect of the present invention provides a method for preparing a high-toughness C / ultra-high temperature ceramic composite material, the preparation method comprising the following steps:

[0024] (1) Provide carbon / carbon matrix;

[0025] (2) Under vacuum conditions, ultrasonically mix the expanded boron nitride and the hafnium-tantalum precursor solution to form the expanded boron nitride-modified hafnium-tantalum precursor solution;

[0026] (3) Using the hafnium-tantalum precursor solution modified by the expanded boron nitride as a reactant, react with the carbon / carbon matrix prepared in step (1) by the dipping cracking method to form expanded boron nitride toughened C / C composite material;

[0027] (4) Repeat step (3) at least once to obtain expanded boron nitride toughened C / ultra-high temperature ceramic matrix composite material.

[0028] According to some preferred embodiments, the carbon / carbon matrix is ​​a carbon fiber-reinforced carbon matri...

Embodiment 1

[0044] (1) Provide carbon / carbon matrix: provide a density of 0.5g / cm 3 The carbon / carbon matrix is ​​prepared by deposition of carbon matrix on the stitched carbon fiber preform by chemical vapor deposition method.

[0045](2) Expanded boron nitride modified hafnium tantalum precursor solution: disperse boron nitride powder in sodium hydroxide solution (the ratio of boron nitride powder to sodium hydroxide is 1:10, sodium hydroxide The concentration of the solution is 10 g / mL), and placed in a high temperature and high pressure reaction kettle for high temperature and high pressure reaction to obtain expanded boron nitride. Take the above 10.0g expanded boron nitride and place it in a 250mL round bottom flask, add 100.0g hafnium tantalum precursor solution into the long-necked funnel, the mass ratio of expanded boron nitride and hafnium tantalum precursor solution is 1:10, seal the above Round-bottom flask and long-necked funnel, and use a vacuum pump to draw a vacuum. Afte...

Embodiment 2

[0050] (1) Provide carbon / carbon matrix: provide a density of 0.5g / cm 3 The carbon / carbon matrix is ​​prepared by depositing carbon matrix on the stitched carbon fiber preform by chemical vapor deposition process.

[0051] (2) Boron nitride-modified hafnium-tantalum precursor solution: disperse boron nitride powder in sodium hydroxide solution, and place it in a high-temperature and high-pressure reactor for reaction treatment to obtain expanded boron nitride. Take the above 10.0g expanded boron nitride and place it in a 250mL round bottom flask, add 500.0g hafnium tantalum precursor solution into the long-necked funnel, the mass ratio of expanded boron nitride and hafnium tantalum precursor solution is 1:50, seal the above Round-bottom flask and long-necked funnel, and use a vacuum pump to draw a vacuum. After the vacuum in the device reaches 10 Pa and is stable for 5 minutes, slowly drop the hafnium-tantalum precursor solution in the long-necked funnel into the round-bottom...

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Abstract

The invention relates to a preparation method of a high-toughness C / ultrahigh-temperature ceramic composite material. The preparation method comprises the following steps: (1) providing a carbon / carbon matrix; (2) carrying out ultrasonic mixing on the expanded boron nitride and the hafnium tantalum precursor solution under a vacuum condition to form an expanded boron nitride modified hafnium tantalum precursor solution; (3) taking the boron nitride modified hafnium tantalum precursor solution as a reactant, and reacting the reactant with the carbon / carbon matrix prepared in the step (1) through an impregnation pyrolysis method to form an expanded boron nitride toughened C / C composite material; and (4) repeating the step (3) for at least one time to obtain the boron nitride toughened C / ultrahigh-temperature ceramic matrix composite material. According to the preparation method disclosed by the invention, the matrix toughness of the C / ultra-high-temperature ceramic matrix composite material is further improved, so that the problem that the C / ultra-high-temperature ceramic matrix composite material has relatively poor mechanical properties due to relatively many matrix cracks is effectively solved.

Description

technical field [0001] The invention relates to the technical field of preparation of ultra-high temperature ceramic-based composite materials, in particular to a high-toughness C / ultra-high temperature ceramic composite material and a preparation method thereof. Background technique [0002] Aerospace vehicles need to experience the test of extreme service environments, and put forward higher requirements for ultra-high temperature resistant materials. Ultra High Temperature Ceramics (UHTCs) represented by metal carbides and borides have extremely high melting points (> 3000℃), becoming the most potential candidate material for aerospace vehicles. However, the inherent brittleness of ultra-high temperature ceramics makes them extremely prone to irreversible and destructive fractures, causing extremely serious consequences. In recent years, in order to improve the toughness of ultra-high temperature ceramics, continuous carbon fiber can be used to reinforce ultra-high te...

Claims

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Application Information

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IPC IPC(8): C04B35/80C04B35/56C04B35/583C04B35/626C04B35/63
CPCC04B35/80C04B35/583C04B35/5622C04B35/5607C04B35/62605C04B35/63C04B2235/422C04B2235/5248C04B2235/3839C04B2235/386C04B2235/656C04B2235/6567C04B2235/658C04B2235/96C04B2235/77
Inventor 杨良伟朱申刘伟宋环君张宝鹏陈昊然于新民刘俊鹏孙同臣
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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