Carbon fibre enhanced reaction sintering silicon carbide ceramic and preparation method thereof

A technology of sintered silicon carbide and silicon carbide, which is applied in the field of materials, can solve problems such as product cracking, low green body strength, and uneven density of grouted green bodies, and achieve the effects of high fracture toughness and high elastic modulus

Inactive Publication Date: 2008-01-16
山东金鸿集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, reaction sintered silicon carbide ceramics are mostly formed by traditional ceramic grouting process. For products with complex shapes, defects such as product cracking are often caused by uneven density of the grouting body, and due to the low strength of the grouting body, Cannot be machined

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 25g of acrylamide monomer and 1g of N,N'-methylenebisacrylamide crosslinking agent to 100g of water and stir until dissolved, then add 1g of tetramethylammonium hydroxide to prepare a mixed solution, then add 320g of silicon carbide powder and carbon black 40g was added to the above mixed solution to prepare a ceramic composite slurry, and after ball milling for 6 hours, 30g of carbon fiber was added and then ball milled for 3 hours to obtain a slurry with good fluidity. After vacuum defoaming at room temperature for 10 minutes, 2.5 g of ammonium persulfate initiator was added to the slurry and uniformly dispersed. The above ceramic composite slurry is poured into a glass mold, heated to 60°C, solidified and demoulded after 30 minutes, and a green body of reaction sintered silicon carbide / carbon fiber composite material can be obtained. Dry the green body in an oven at 60°C for 24 hours, then put it into a vacuum reaction sintering furnace for sintering, keep it at ...

Embodiment 2

[0030] As described in Example 1, the difference is that the carbon black is 50 g, the sintering temperature is 1700° C., and it is kept for 4 hours and naturally cooled.

Embodiment 3

[0032] Add 20g of methacrylamide and 1g of N,N'-methylenebisacrylamide crosslinking agent to 100g of water and stir until dissolved, then add 1.5g of polyvinylpyrrolidone to prepare a mixed solution, then add 320g of silicon carbide powder and 40g of carbon black Prepare a ceramic composite slurry in the above mixed solution, add 40 g of carbon fibers after ball milling for 8 hours, and then ball mill for 5 hours to obtain a slurry with better fluidity. After vacuum defoaming at room temperature for 10 minutes, 2.5 g of ammonium persulfate initiator was added to the slurry and uniformly dispersed. Inject the above-mentioned ceramic composite slurry into a metal mold, heat to 50° C., solidify and demould after 45 minutes, and a green body of reaction-sintered silicon carbide / carbon fiber composite material can be obtained. The green body is dried in an oven at 70°C for 18 hours and then placed in a vacuum reaction sintering furnace for sintering. It is kept at 600°C for 3 hours...

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Abstract

The present invention relates to a carbon fiber reinforced reaction sintering silicon carbide ceramic and the preparation method, belonging to material technical field. Composite material perform is prepared by using gel-casting technology; the portions of the components include 100 weight portions of silicon carbide, 7-18 weight portions of carbon black and 2-8 weight portions of carbon fiber. The preparation method is that the composite powders of component silicon carbide and carbon black, and carbon fiber are dispersed in the solution of organic monomer and crosslinking agent; the solidified molded perform is fully dried at 60-80 DEG C to get the perform; the perform will then be buried under silicon powders in a sintering furnace for gel removal and thermal insulation at the temperature of 500 to 800 DEG C, and the sintering temperature is 1500 to 1800 DEG C. The reaction sintering silicon carbide ceramic carbon fiber prepared by the invention can be uniformly dispersed in the perform and the fracture toughness of the carbon fiber / reaction sintering silicon carbide composite material is significantly increased compared with that of the matrix.

Description

technical field [0001] The invention relates to a carbon fiber reinforced reaction sintered silicon carbide ceramic composite material and a preparation method thereof, belonging to the field of material technology. Background technique [0002] The reaction sintered silicon carbide prepared by the reaction sintering process inherits the high hardness of silicon carbide ceramics, good thermal shock resistance, good wear resistance and corrosion resistance, high thermal conductivity, low expansion coefficient, high temperature strength and excellent oxidation resistance. It is a high-tech ceramic material with great development potential and broad application prospects. Reaction sintered silicon carbide is prepared by infiltrating silicon into a green body containing silicon carbide and carbon black at high temperature, and reacting with carbon to form silicon carbide. This newly formed silicon carbide combines the original silicon carbide particles in the green body together...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/573C04B35/83C04B35/622
Inventor 聂丽芳张玉军龚红宇王汝江张怀顺于海培
Owner 山东金鸿集团有限公司
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