Making method of silicon carbide/carbon functional gradient material

A technology of functionally graded materials and manufacturing methods, which is applied in the field of manufacturing silicon carbide/carbon functionally graded materials, and can solve the problems of engineering materials with low mechanical strength, unsuitable, unsuitable, and usable

Inactive Publication Date: 2014-05-21
成都润封电碳有限公司
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AI Technical Summary

Problems solved by technology

[0002] Carbon graphite material has the characteristics of high temperature resistance, corrosion resistance, self-lubrication, etc., but as an engineering material, the mechanical strength is not high and basically cannot be used in an oxidizing atmosphere (oxidation begins at 350°C)
At present, in order to improve the high-temperature oxidation resistance, the main method is to increase the material purity, increase the material density, impregnate inorganic salts, etc. to reduce the porosity of the material, reduce the contact of oxygen with the material, and thereby improve the oxidation resistance of the material. Improved over normal pure carbon graphite materials, but still not ideal

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0010] Material selection: carbon graphite material is commercially available, industrial silicon is commercially available, and the silicon content is ≥99%.

[0011] Rough processing: process the carbon graphite material into the material to be processed according to the required specifications, clean and dry.

[0012] High-temperature silicon immersion treatment: put the dried product and silicon material into the crucible, place it in a high-temperature vacuum furnace for silicon immersion treatment, start vacuuming in the cold state, the vacuum degree is ≤0.5MPa, and raise the temperature at the same time, when the furnace temperature rises to 1400°C Stop vacuuming, then continue to heat up to 1500°C~1700°C, maintain the furnace temperature for 10~30 minutes, then pass in an inert gas and pressurize to 1~3MPa, keep for 5~15 minutes, release the pressure to 0.1MPa, then cool down naturally to room temperature.

[0013] Subsequent treatment: Take out the cooled product, rem...

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Abstract

A making method of a silicon carbide/carbon functional gradient material is as follows: a carbon graphite material is used as a base material for silicon infiltration treatment at 1500-1700 DEG C, and then is put in a high temperature vacuum graphitizing furnace for reacting with silicon to produce the silicon carbide/carbon functional gradient material; the silicon carbide/carbon functional gradient material is prepared by successive combination of two materials with different properties into one, wherein one material is continuously transited to the other material, and no obvious interface is produced among various parts of the material. The silicon carbide/carbon functional gradient material has self-lubricating property, good heat conductivity and electrical conductivity, good thermal shock resistance and high temperature strength of the graphite material, and high hardness and high strength, high temperature oxidation resistance, strong corrosion resistance, abrasion resistance and other properties of silicon carbide.

Description

technical field [0001] The invention is a method for manufacturing a silicon carbide / carbon functionally graded material. Background technique [0002] Carbon graphite materials have the characteristics of high temperature resistance, corrosion resistance, self-lubrication, etc., but as engineering materials, the mechanical strength is not high and basically cannot be used in an oxidizing atmosphere (starting to oxidize at 350°C). At present, in order to improve the high-temperature oxidation resistance, the main method is to increase the material purity, increase the material density, impregnate inorganic salts, etc. to reduce the porosity of the material, reduce the contact of oxygen with the material, and thereby improve the oxidation resistance of the material. It is improved compared to general pure carbon graphite materials, but still not ideal. Contents of the invention [0003] The purpose of the present invention is to provide a method for manufacturing silicon c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/622
Inventor 胡建文
Owner 成都润封电碳有限公司
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