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Complex-shaped ceramic matrix composite part and preparation method thereof

A composite material and complex shape technology, which is applied in the field of complex shape ceramic matrix composite parts and its preparation, can solve the problems of limited application range, high brittleness and low toughness of silicon carbide ceramic materials, and achieve good packing density and excellent mechanical properties , the effect of high forming precision

Active Publication Date: 2021-12-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong covalency between C and Si atomic bonds, silicon carbide ceramic materials have high brittleness, low toughness and poor impact resistance, which seriously limit its application range.

Method used

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  • Complex-shaped ceramic matrix composite part and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Mix silicon carbide ceramic powder and WC-8wt.% Co cemented carbide powder uniformly at a mass ratio of 3.33:1 for later use, wherein the particle size of silicon carbide ceramic powder is 40-60 μm, WC-8wt.% Co cemented carbide The maximum particle size of the powder is 48 μm. Add the uniformly mixed powder into the toluene solution of ethylene-vinyl acetate copolymer, keep the reaction vessel airtight and set up a toluene collection device, wherein the mass ratio of the mixed powder to EVA is 31:0.72; stir the mixed solution and raise the temperature to 50°C for 2 hours After the reaction is complete, the modified powder is obtained by suction filtration, drying, grinding and sieving. Disperse the modified powder evenly in the ethanol solution, the amount of ethanol should be such that the stirring paddle of the reactor is below the liquid level, add styrene, dibenzoyl peroxide, and paraffin, and the mass ratio of the mixed powder to styrene is 18:0.89, the mass ratio...

Embodiment 2

[0046] The silicon carbide ceramic powder and TiC-2wt.%Ni-2wt.%Mo cemented carbide powder are uniformly mixed at a mass ratio of 4:1 for later use, wherein the particle size of the silicon carbide ceramic powder is 35-50μm, and the TiC-2wt. The maximum particle size of %Ni-2wt.%Mo cemented carbide powder is 36μm. Add the uniformly mixed powder into the toluene solution of ethylene-vinyl acetate copolymer, keep the reaction vessel airtight and set up a toluene collection device, wherein the mass ratio of the mixed powder to EVA is 31:0.65; stir the mixed solution and raise the temperature to 50°C for 4 hours After the reaction is complete, the modified powder is obtained by suction filtration, drying, grinding and sieving. Disperse the modified powder evenly in the ethanol solution, the amount of ethanol should be such that the stirring paddle of the reactor is below the liquid level, add styrene, dibenzoyl peroxide, and paraffin, and the mass ratio of the mixed powder to styre...

Embodiment 3

[0048] The silicon carbide ceramic powder and TiC-2wt.%Ni-2wt.%Mo cemented carbide powder are uniformly mixed at a mass ratio of 6:1, and the particle size of the silicon carbide ceramic powder is 35-60μm, and the TiC-2wt. The maximum particle size of %Ni-2wt.%Mo cemented carbide powder is 40μm. Add the uniformly mixed powder into the toluene solution of ethylene-vinyl acetate copolymer, keep the reaction vessel airtight and set up a toluene collection device, wherein the mass ratio of mixed powder to EVA is 31:0.60; stir the mixed solution and heat up to 55°C for 3h After the reaction is complete, the modified powder is obtained by suction filtration, drying, grinding and sieving. Disperse the modified powder evenly in the ethanol solution, the amount of ethanol added should make the stirring paddle of the reactor below the liquid level, add styrene, dibenzoyl peroxide, paraffin, the mass ratio of modified powder to styrene It is 18:0.83, and the mass ratio to paraffin is 37...

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Abstract

The invention belongs to the field of advanced composite preparation research, and particularly provides a complex-shaped ceramic matrix composite part and a preparation method thereof. The method comprises the steps that firstly, ceramic powder and hard alloy powder are evenly mixed according to the proportion, the surface of the mixed powder is evenly coated with an ethylene-vinyl acetate copolymer layer, and modified powder is obtained; then, the modified powder is uniformly dispersed in an ethanol solution, styrene, an initiator and paraffin are added, heating is conducted, stirring is conducted uniformly, after drying, grinding and sieving are conducted to obtain PS / EVA double-coating powder, and the double-coating powder is subjected to shaping by adopting suspended shaping; and low-temperature printing is conducted, a printing blank with a complex shape is obtained, and the hard alloy reinforced ceramic matrix composite part with the complex shape is obtained through degreasing and sintering. The method has the beneficial effects that the possibility is provided for preparing the ceramic matrix composite part with the complex shape, and the method has the advantages of flexible design, near-net forming, low-cost preparation of large-size parts and the like.

Description

technical field [0001] The invention belongs to the research field of preparation of advanced composite materials, and in particular provides a complex-shaped ceramic matrix composite material part and a preparation method thereof. Background technique [0002] Silicon carbide ceramics has the characteristics of low density, high strength, high temperature resistance, small thermal expansion coefficient and thermal shock resistance. It is considered as one of the ideal structural materials and has been widely used in modern defense, nuclear energy and other fields. However, due to the strong covalency between C and Si atomic bonds, silicon carbide ceramic materials have high brittleness, low toughness and poor impact resistance, which seriously limit its application range. The purpose of enhancing toughness can be achieved by introducing second-phase particles into silicon carbide ceramics, and the second-phase particles introduced are usually the reinforced phases that have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/16B22F1/00B22F1/02B22F3/10B22F9/04B22F10/64B33Y10/00B33Y40/10B33Y70/10B33Y80/00
CPCB22F10/16B22F10/64B22F3/1021B33Y10/00B33Y40/10B33Y80/00B33Y70/10B22F9/04Y02P10/25
Inventor 张百成赵琛蔡嘉伟章林曲选辉张茂航
Owner UNIV OF SCI & TECH BEIJING
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