[특허]Process for producing dense, self-sintered silicon carbide/carbon-graphite composites

Process for producing dense, self-sintered silicon carbide/carbon-graphite composites 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C01B-031/00
출원번호	US-0335446 (1994-11-07)
발명자 / 주소	Chen Xin E. Pfaff Mark E.
출원인 / 주소	The Morgan Crucible Company, PLC, GBX
대리인 / 주소	Kilpatrick StocktonRussell
인용정보	피인용 횟수 : 31 인용 특허 : 69

초록 ▼

A dense, self-sintered silicon carbide/carbon-graphite composite material and a process for producing the composite material. The composite material includes a silicon carbide matrix, between 2 and 30 percent by weight carbon-graphite, and small amounts of sintering aids such as boron and free carbon. The silicon carbide has an average grain size between 2 and 15 .mu.m, and the carbon-graphite has an average grain size between 10 and 75 .mu.m, the average grain size of the carbon-graphite being greater than the average grain size of the silicon carbide. The composite material has a density of at least 80 percent of theoretical density as determined by the rule of mixtures for a composite material. This density is achieved with minimal microcracking at a high graphite loading with large graphite particles. The composite material exhibits good lubricity and wear characteristics, resulting in improved tribological performance. The process for producing the composite material uses a carbon-bonded graphite including at least 5 percent by weight carbon-precursor binder.

대표청구항 ▼

[ We claim:] [1.] A process for producing a dense, self-sintered silicon carbide/carbon-graphite composite material comprising the steps of:(a) providing a particulate mixture comprising:(i) between 2 and 30 percent, based on the weight of the particulate mixture, of particles of bonded graphite, the bonded graphite comprising graphite particles coated with at least 5 percent by weight carbon-precursor binder, formed by mixing the graphite particles with the carbon precursor binder, drying the graphite/binder mixture, and optionally crushing the dried graphite/binder mixture,(ii) between 1 and 10 percent by weight of a green body binder,(iii) between 0.1 and 15 percent by weight of a sintering aid;(iv) between 1 and 5 percent by weight of a lubricant, and(v) silicon carbide;(b) shaping the mixture to form a green body bound by the green body binder,(c) heating the green body to a carbonizing temperature and maintaining said temperature for a time sufficient to carbonize the carbon-precursor binder; and subsequently(d) producing from the carbonized body a sintered body having a theoretical density of at least 80 percent and a microstructure in which the average grain size of the carbon-graphite is larger than the average grain size of the silicon carbide and in which the average grain size of the carbon graphite is at least 10 .mu.m, by sintering the carbonized body at a temperature above the carbonizing temperature and ranging from 1900.degree. C. to 2300.degree. C. in a substantially inert atmosphere.

이 특허에 인용된 특허 (69)

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Laskow William (Downingtown PA) Morelock Charles R. (Ballston Spa NY), Method of making a shaped silicon carbide-silicon matrix composite and articles made thereby.
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Johnson Curtis A. (Ballston Lake NY) Prochazka Svante (Ballston Lake NY), Strength improvement in machined SiC bodies.
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Process for producing dense, self-sintered silicon carbide/carbon-graphite composites 원문보기

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Process for producing dense, self-sintered silicon carbide/carbon-graphite composites 원문보기

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