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Gradient ultrahigh-temperature ceramic-based composite material and preparation method thereof

A technology of ultra-high temperature ceramics and composite materials, which is applied in the field of gradient ultra-high temperature ceramic matrix composite materials and its preparation, can solve the problems of affecting product weight, large difference in inner and outer densities, and large deviation of expansion coefficients of inner and outer layers, etc. Designability, excellent high temperature ablation resistance

Active Publication Date: 2019-12-31
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
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Problems solved by technology

However, the internal density of the material produced by the impregnation-cracking method is relatively high, which affects the weight of the final product, while the gradient ultra-high temperature ceramics produced by the slurry method have a thin dense layer, a large difference in inner and outer density, and a deviation in the expansion coefficient of the inner and outer layers under high temperature conditions. Larger, prone to exfoliation of dense shell

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  • Gradient ultrahigh-temperature ceramic-based composite material and preparation method thereof
  • Gradient ultrahigh-temperature ceramic-based composite material and preparation method thereof

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[0033] The invention provides a preparation method of a gradient ultra-high temperature ceramic matrix composite material, such as figure 1 shown, including the following steps:

[0034] (1) Preparation of slurry with gradient concentration

[0035] The solid component is zirconium carbide powder, the liquid component is thermosetting phenolic resin, and the solid component and the liquid component are mixed to prepare n slurry with gradient concentration, wherein n≥2.

[0036] The thermosetting resin is preferably barium phenolic resin. The particle size of the zirconium carbide powder is 0.5-4 μm. Too small particles will increase the cost, and too large particles will affect the subsequent preparation process. It is more preferably 1-3 μm, for example, it can be 1 μm, 2 μm, or 3 μm.

[0037] The gradient concentration scope of described slurry is preferably 10~60% (for example, can be 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%) ), that is, the mass percentage ...

Embodiment 1

[0070] (1) Preparation of slurry with gradient concentration

[0071] The solid component uses zirconium carbide powder with a particle size of 4 μm, and the liquid component uses aminophenol-formaldehyde resin. The solid component and the liquid component are mixed to prepare two gradient concentrations of slurry, which are: ① Powder content 10wt.% slurry, ② 60wt.% powder slurry.

[0072] (2) Preparation of prepreg

[0073] Using hot-melt adhesive film method, two formulations of phenolic resin slurry were compounded with carbon cloth respectively to prepare prepregs with two powder contents, wherein the mass content of resin slurry in the prepreg was 60%.

[0074] (3) Preparation of composite material components

[0075] Lay multiple prepregs prepared in step (2), control the fiber volume fraction of the product to 40% through the number of layers, and realize the gradient of ceramic powder in the low-density green body by laying prepregs with different powder contents , ...

Embodiment 2

[0085] (1) Preparation of slurry with gradient concentration

[0086] The solid component uses zirconium carbide powder with a particle size of 4 μm, and the liquid component uses aminophenol-formaldehyde resin. The solid component and the liquid component are mixed to prepare two gradient concentrations of slurry, which are: ① Powder content 20wt.% slurry, ② 40wt.% powder slurry.

[0087] (2) Preparation of prepreg

[0088] Using hot-melt adhesive film method, two formulations of phenolic resin slurry were compounded with carbon cloth respectively to prepare prepregs with two powder contents, wherein the mass content of resin slurry in the prepreg was 60%.

[0089] (3) Preparation of composite material components

[0090] Lay multiple prepregs prepared in step (2), control the fiber volume fraction of the product to 40% through the number of layers, and realize the gradient of ceramic powder in the low-density green body by laying prepregs with different powder contents , ...

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Abstract

The invention relates to a gradient ultrahigh-temperature ceramic-based composite material and a preparation method thereof. The method comprises the following steps: (1) preparing slurry of gradientconcentrations, namely, by taking zirconium carbide powder as a solid component, and thermoset phenolic resin as a liquid component, mixing the solid component with the liquid component, and performing preparation so as to obtain slurry of n gradient concentrations, wherein n is greater than or equal to 2; (2) preparing prepregs, namely, respectively compounding the slurry of n gradient concentrations with n pieces of carbon cloth so as to obtain multiple prepregs; (3) preparing a composite material component, namely, laying and overlapping the multiple prepregs obtained in the step (2), and curing the prefabricated body obtained after laying so as to obtain the composite material component, wherein the content of the powder changes in a gradient manner along a thickness direction; (4) performing pyrolysis; (5) preparing a C / C blank by using a PIP (pyrolysis process); and (6) performing melting siliconing. By adopting the preparation method provided by the invention, the gradient ultrahigh-temperature ceramic-based composite material which is low in density and excellent in high-temperature ablation resistance can be prepared, and has substantive benefits in fields of space flightand aviation.

Description

technical field [0001] The invention relates to the technical field of ultra-high temperature ceramic-based composite materials, in particular to a gradient ultra-high-temperature ceramic-based composite material and a preparation method thereof. Background technique [0002] Ultra-high temperature ceramic matrix composites have a series of excellent properties such as high temperature resistance, ablation resistance, and thermal shock resistance, and have broad application prospects in the aerospace field. The gradient ultra-high temperature ceramic matrix composite material has a dense layer on the working surface of the material, so that the material has excellent ablation resistance while maintaining low density. [0003] The preparation process of ultra-high temperature ceramic matrix composites is generally the precursor impregnation-pyrolysis method and the slurry method. The above process adopts the precursor or the mixed slurry of the precursor and the powder, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/56C04B35/622C04B41/85
CPCC04B35/83C04B35/5622C04B35/622C04B41/85C04B41/5096C04B2235/775C04B2235/602C04B2235/6567C04B2235/77C04B2235/9607C04B41/4545C04B41/0072
Inventor 霍鹏飞李晓东陈艳武陈鑫阳于新民赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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