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A gradient ultra-high temperature ceramic matrix composite material and its preparation method

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 large difference in inner and outer density, influence product weight, peeling of dense shell, etc., and achieve high temperature ablation resistance. Excellent and designable effects

Active Publication Date: 2022-03-25
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A gradient ultra-high temperature ceramic matrix composite material and its preparation method
  • A gradient ultra-high temperature ceramic matrix composite material and its preparation method

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preparation example Construction

[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 ultra-high temperature ceramic matrix composite material and a preparation method thereof. The method comprises the following steps: (1) preparing slurry with a gradient concentration: the solid component is zirconium carbide powder, the liquid component is thermosetting phenolic resin, Mix the solid component and the liquid component to prepare n slurries with gradient concentrations, where n≥2; (2) Preparation of prepreg: compound n slurries with gradient concentrations with n parts of carbon cloth respectively to obtain Multiple prepregs; (3) Preparation of composite material components: stacking multiple prepregs prepared in step (2), when stacking, along the thickness direction, the powder content changes in a gradient; the layup The final prefabricated body is solidified to obtain a composite material component; (4) cracking; (5) PIP process to prepare a C / C green body; (6) molten silicon infiltration. The gradient ultra-high temperature ceramic matrix composite material with low density and excellent high temperature ablation resistance can be prepared by using the preparation method provided by the invention, which has substantial benefits in the field of aerospace.

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 Patents(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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