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Preparation method of graphite/SiC composite material

A composite material and graphite technology, which is applied in the field of preparation of graphite/SiC composite materials, can solve the problems of destroying the graphite structure and affecting the properties of graphite, and achieves the effects of low preparation cost, excellent mechanical properties, and short preparation period.

Active Publication Date: 2016-04-13
HUNAN BOWANG CARBON CERAMIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The silicon evaporation method uses silicon evaporation to make silicon vapor react with the carbon surface of the graphite substrate to form a SiC coating; this method will destroy the structure of the graphite itself, thus affecting the performance of graphite in all aspects

Method used

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  • Preparation method of graphite/SiC composite material
  • Preparation method of graphite/SiC composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The density is 1.69g / cm 3 Dry and clean isostatic graphite is used as raw material; after processing according to the designed size, the following operations are performed:

[0065] Step 1: Ceramicization of graphite body

[0066] step one a

[0067] Put the graphite blank into the impregnation tank, vacuumize after sealing, control the vacuum degree below 0.001MPa, inhale a certain amount of impregnation liquid, the impregnation liquid is polymethylsilane and styrene according to the mass ratio of 100:20, vacuum Immerse for 2 hours, increase the pressure to 3MPa, and impregnate for 2 hours; discharge the material, take out the graphite body containing the impregnating liquid, place it in a graphite crucible, put it into a vacuum sintering furnace, and solidify at 600°C under a protective atmosphere, keep it warm for 1h, and crack at 1300°C , keep warm for 1h, cool down, take out the workpiece, and perform surface grinding and cleaning;

[0068] step oneb

[0069] A...

Embodiment 2

[0087] The density is 1.78g / cm 3 Dry and clean isostatic graphite is used as raw material; after processing according to the designed size, the following operations are performed:

[0088] Step 1: Ceramicization of graphite body

[0089] step one a

[0090] Put the graphite blank into the impregnation tank, vacuumize after sealing, control the vacuum degree below 0.001MPa, suck a certain amount of impregnation liquid, the impregnation liquid is polymethylsilane and styrene according to the mass ratio of 100:15, vacuum Immerse for 2.5 hours, increase the pressure to 2.7MPa, and impregnate for 2.5 hours; discharge the material, take out the graphite body containing the impregnating liquid, place it in a graphite crucible, put it into a vacuum sintering furnace, and cure it at 500°C under a protective atmosphere, and keep it for 1 hour. Crack at 1250°C, keep warm for 1.5h, cool down, take out the workpiece, polish and clean the surface;

[0091] step oneb

[0092] After repea...

Embodiment 3

[0110] The density is 1.85g / cm 3 Dry and clean isostatic graphite is used as raw material; after processing according to the designed size, the following operations are performed:

[0111] Step 1: Ceramicization of graphite body

[0112] step one a

[0113] Put the graphite blank into the impregnation tank, vacuumize after sealing, control the vacuum degree below 0.001MPa, suck a certain amount of impregnation liquid, the impregnation liquid is polymethylsilane and styrene according to the mass ratio of 100:10, vacuum Immerse for 3 hours, increase the pressure to 3MPa, and impregnate for 3 hours; discharge the material, take out the graphite body containing the impregnating liquid, place it in a graphite crucible, put it into a vacuum sintering furnace, solidify at 450°C under a protective atmosphere, keep it warm for 1h, and crack at 1200°C , keep warm for 2h, cool down, take out the workpiece, and perform surface grinding and cleaning.

[0114] step oneb

[0115] After r...

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Abstract

The invention discloses a preparation method of a graphite / SiC composite material, and belongs to the technical field of C / SiC composite material preparation. The preparation method adopts graphite the density of which is 1.6-1.85g / cm<3> as a raw material, and comprises the steps: firstly, carrying out soaking, curing, pyrolysis and Si / C reaction to obtain a pre-finished product the density of which is 1.95-2.05g / cm<3>; secondly, carrying out enrichment-pyrolysis on polymethyl silane in a graphite container to obtain a graphite / SiC pre-finished product with an amorphous silicon carbide coating; and finally, carrying out sintering to obtain a graphite / SiC finished product with a beta silicon carbide coating. The porosity of the finished product provided by the invention is less than or equal to 2%, and the problem of cracking when the product is used at a high temperature is avoided.

Description

technical field [0001] The invention discloses a preparation method of a graphite / SiC composite material, which belongs to the technical field of C / SiC composite material preparation. Background technique [0002] Graphite materials have excellent properties such as electrical conductivity, thermal conductivity, corrosion resistance, and self-lubricating properties, and are easier to process than metal materials. As conductive materials and structural materials, they have been widely used in many fields such as electronics, machinery, and semiconductors. Applications. However, due to the existence of residual stress, impurities and pores in the preparation process, there are certain defects inside the graphite material, and these defects become active points that easily absorb oxygen during the use of the material in a high-temperature oxygen-containing atmosphere. As a result, rapid oxidation occurs in an oxygen-containing environment far below its theoretical use temperat...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/009C04B41/87C04B35/522
Inventor 赵倩倩张西岩蒋军军朱建丰
Owner HUNAN BOWANG CARBON CERAMIC CO LTD
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