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Method for producing carbon-containing silicon carbide ceramic

A technology of carbon-containing silicon carbide and silicon carbide, which is applied in the fields of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve the problem of not much disclosure of silicon carbide ceramics, etc., and achieve excellent density and strength. Effect

Inactive Publication Date: 2009-02-11
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] On the other hand, there has not been much disclosure of technologies focusing on the conditions under which silicon carbide ceramics of good quality can be stably produced at a production level

Method used

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  • Method for producing carbon-containing silicon carbide ceramic

Examples

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Comparison scheme
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Embodiment 1～5、9、10

[0061] Embodiment 1~5,9,10, comparative example 1~3

[0062] According to the mixing amount described in Table 1, α-silicon carbide (average particle size is 0.7 μm, purity is 99% by weight), carbon raw material (coal tar pitch: the conversion rate of being converted into carbon after firing is 50% by weight) , with an average particle size of 33 μm) and sintering aids (B 4 C) as a raw material. This raw material was mixed with ethanol using a vibrating mill (model MB: manufactured by Chuo Chemical Equipment Co., Ltd.) having a volume of 5 liters, and then the solvent was removed. The obtained mixture was calcined for two hours at the calcining temperature described in Table 1 under nitrogen atmosphere. The obtained calcined body was wet-pulverized in ethanol using a 5-liter vibrating mill (model MB: manufactured by Chuo Chemical Equipment Co., Ltd.) to obtain a mixture X having an average particle diameter described in Table 1. The obtained mixture X was granulated by a sp...

Embodiment 6～8

[0063] Embodiment 6~8, comparative example 4~6

[0064] According to the mixing amount described in Table 1, α-silicon carbide (average particle size is 0.7 μm, purity is 99% by weight), carbon raw material (calcined bitumen: the conversion rate of converting to carbon after firing is 90% by weight, The average particle size is 12μm) and sintering aid (B 4 C) as a raw material. Mixture X having the average particle diameter described in Table 1 was obtained by mixing and pulverizing this raw material in water using a vibrating mill (model MB: manufactured by Chuo Chemical Equipment Co., Ltd.) with a volume of 15 liters. The obtained mixture X was granulated, molded, degreased, and fired in the same manner as in Examples 1 to 5, 9, and 10 and Comparative Examples 1 to 3 to obtain a sintered body (carbon-containing silicon carbide ceramic) as a test piece.

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Abstract

Disclosed is a method for commercially producing a carbon-containing silicon carbide ceramic which is excellent in structure and various physical properties, especially in density and strength after sintering. Specifically disclosed is a method for producing a carbon-containing silicon carbide ceramic which comprises a step for firing a raw material mixture X containing silicon carbide, a carbon material and a sintering assistant. In this method, the average particle diameter of the particles constituting the raw material mixture X is 0.05-3 [mu]m.

Description

technical field [0001] The present invention relates to a method for producing carbon-containing silicon carbide ceramics excellent in sinterability, ceramics obtained by the production method, and sliding parts or high-temperature structural parts containing the ceramics. Background technique [0002] Since silicon carbide ceramics are excellent in hardness, heat resistance, and corrosion resistance, their use as structural components has been actively studied in recent years. In particular, it has been partially put into practical use as structural components such as mechanical seals and bearings. [0003] On the other hand, there are not many disclosures focusing on the conditions under which silicon carbide ceramics of good quality can be stably produced at a production level. [0004] For example, Patent Document 1 discloses the following method for producing silicon carbide ceramics: in order to obtain dense silicon carbide ceramics, a specific carbon raw material is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565
CPCC04B2235/5445C04B35/62655C04B35/62675C04B2235/3821C04B35/6267C04B35/63496C04B2235/422C04B2235/80C04B2235/5454C04B35/565C04B2235/77C04B2235/767C04B2235/3826C04B35/638C04B2235/604C04B2235/96C04B35/524C04B2235/656C04B35/532C04B2235/5436C04B35/6262B82Y30/00
Inventor 阪口美喜夫井上启作星田浩树
Owner KAO CORP