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A kind of preparation method of charcoal reinforced silicon carbide matrix composite material

A silicon carbide-based, composite material technology, applied in the field of composite material preparation, can solve the problems of insufficient high-temperature strength and wear resistance, large silicon carbide particles, and high free silicon content, and achieve high density, high yield, and short process. Effect

Active Publication Date: 2022-01-04
北京信汇碳硅科技有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] At present, the preparation method of shaped charcoal-reinforced silicon carbide-based composites is mainly the reaction sintering method, that is, at high temperature, the liquid phase silicon or silicon alloy with reactivity is infiltrated into porous charcoal under the action of capillary force. Two disadvantages, one is that the carbon billet is easy to crack during the reaction process, and the yield is low, and the other is that the obtained material has insufficient high-temperature strength and wear resistance due to the large silicon carbide particles formed and high free silicon content.

Method used

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  • A kind of preparation method of charcoal reinforced silicon carbide matrix composite material

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Effect test

Embodiment 1

[0030] Choose soft-leaved Chinese fir, and process it into a uniform wooden stick with a length of 60cm and a diameter of 6cm, with a density of 0.6g / cm 3 , no scars on the surface. After dehydration at 130° C. in vacuum for two hours, soak in 20% ethylenediamine aqueous solution for one day, and then dehydrate at 140° C. in vacuum for 2 hours. Carbonize in a vacuum furnace at 900°C for 1 hour. Sand the carbon rod carefully with sandpaper, and blow off the attached carbon powder with compressed air. Obtain the charcoal rod (diameter 4.2cm, long 46cm, density of 1.3g / cm2) of uniform appearance 3) put the charcoal rod in a vacuum impregnation tank, control the vacuum degree ≤0.001MPa, and vacuum impregnate for 3 hours. The impregnating agent in the vacuum impregnation tank consists of: 120 parts of polymethylsilane, 20 parts of 1,5-hexadiene, even 2 parts of nitrogen bisisobutyronitrile; then solidify under nitrogen atmosphere, wherein the curing procedure is: first raise the...

Embodiment 2

[0032] Choose soft-leaved Chinese fir, and process it into a uniform wooden stick with a length of 60cm and a diameter of 6cm, with a density of 0.55g / cm 3 , no scars on the surface. After dehydration at 150° C. in vacuum for 2 hours, soak in 20% ethylenediamine aqueous solution for one day, and then dehydrate at 150° C. in vacuum for 2 hours. Then carbonize in a vacuum furnace at 900°C for 1 hour. Sand the carbon rod carefully with sandpaper, and blow off the attached carbon powder with compressed air. Obtain the charcoal rod (diameter 4cm, long 43cm, density of 1.25g / cm2) of uniform appearance 3 ) put the charcoal rod in a vacuum impregnation tank, control the vacuum degree ≤ 0.001MPa, and vacuum impregnate for 3 hours. The impregnating agent in the vacuum impregnation tank consists of: 90 parts of polymethylsilane, 25 parts of 1,5-hexadiene, even 3 parts of nitrogen bisisobutyronitrile; then solidify under nitrogen atmosphere, wherein the curing procedure is: first raise...

Embodiment 3

[0034] Choose pine wood, process it into a uniform wooden stick with a length of 60cm, a diameter of 6cm, and a density of 0.6g / cm 3 , no scars on the surface. After dehydration at 140° C. in vacuum for 3 hours, soak in 20% ethylenediamine aqueous solution for one day, and then dehydrate at 120° C. in vacuum for 4 hours. Then carbonize in a vacuum furnace at 900°C for 1 hour. Sand the carbon rod carefully with sandpaper, and blow off the attached carbon powder with compressed air. Obtain the charcoal rod (diameter 4cm, long 43cm, density of 1.3g / cm2) of uniform appearance 3 ) put the charcoal rod in a vacuum impregnation tank, control the vacuum degree ≤0.001MPa, and vacuum impregnate for 4 hours. The impregnating agent in the vacuum impregnation tank consists of: 110 parts of polymethylsilane, 30 parts of 1,5-hexadiene, 4 parts of nitrogen diisobutyronitrile; then solidify under a nitrogen atmosphere, wherein the curing procedure is: first raise the temperature to 55°C at ...

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Abstract

The invention discloses a method for preparing a charcoal-reinforced silicon carbide-based composite material, which comprises the following steps: placing the charcoal in an impregnating agent A for the first impregnation, followed by the first curing to obtain a first-time cured green body, Then put the first cured green body in the impregnating agent B for the second impregnation, and then perform the second curing to obtain the second cured green body, and finally wrap the second cured green body in carbon cloth. The charcoal-reinforced silicon carbide-based composite material can be obtained through sintering treatment, wherein the ceramic precursor in the impregnating agent is polymethylsilane, and the charcoal-reinforced silicon carbide-based composite material is prepared by adopting the precursor transformation method pioneered by the present invention, and the obtained charcoal-reinforced silicon carbide The matrix composite material has high density, and the density is 1.85g / cm 3 Above, it has excellent mechanical strength, high temperature resistance, and wear resistance, and can replace carbon fiber reinforced ceramic materials in a wide range.

Description

technical field [0001] The invention relates to a method for preparing a charcoal-reinforced silicon carbide-based composite material, which belongs to the technical field of composite material preparation. Background technique [0002] In recent years, the application of ceramic matrix composites in high-tech fields has been highly valued by major scientific and technological countries. Among them, carbon fiber is used as a reinforcement and silicon carbide is used as a matrix material (C f / SiC) has the most extensive research and application, and has a very broad development prospect. However, due to the high cost of carbon fiber and its prefabricated body, the composite process cycle is very long, resulting in high cost of this type of composite material, and at the same time, only simple structural parts can be formed, which seriously restricts its application in the industrial field. [0003] Charcoal-reinforced silicon carbide-based composite material is another hot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/65C04B35/84C04B35/80
CPCC04B35/571C04B35/622C04B35/573C04B35/65C04B2235/422C04B2235/616C04B2235/77C04B2235/52C04B2235/96C04B35/6325
Inventor 李效东查志伟曾建新赵开新
Owner 北京信汇碳硅科技有限公司
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