Patent US4994418A successfully refreshed from Google Patents.
US4994418A
Expired / Lapsed
US
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Ceramic compact and a process for the production of the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1989-12-18
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Granted: 1991-02-19
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Expires: 2009-12-18
Abstract
Abstract A ceramic compact having a more excellent high temperature strength, toughness and reliability, which comprises a silicon nitride matrix and ceramic fibers uniformly dispersed in the matrix and orientated in a desired direction, said matrix and fibers being closely bonded by sintering, is provided. This compact is produced, for example, by preparing a shaped body of silicon in which ceramic fibers are uniformly dispersed and then bearing and nitriding the shaped body in a nitrogen atmosphere to form a fiber-reinforced silicon nitride sintered compact.
Inventors
- 👤 Akira Yamakawa
- 👤 Yoshihiko Doi
- 👤 Masaya Miyake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/01; C04B35/013; C04B35/10; C04B35/46; C04B35/462; C04B35/48; C04B35/56; C04B35/565; C04B35/591; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A sintered ceramic compact comprising a matrix of silicon nitride and ceramic fibers which fibers are present in an amount of 0.1 to 45% by volume based on the volume of the ceramic compact uniformly dispersed therein and orientated in a direction by a centrifugal force, said matrix and fibers being closely bonded by sintering to form a fiber-reinforced compact sintered body of silicon nitride, wherein the ceramic fibers are selected from the group consisting of fibers of alumina, silicon nitride, silicon carbide, carbon, potassium titanate and zirconium oxide and mixtures thereof.
Claim 2
Dependent Claim
92 words
A sintered ceramic compact comprising a matrix of silicon nitride and ceramic fibers which fibers are present in an amount of 0.1 to 45% by volume based on the volume of the ceramic compact uniformly dispersed therein and orientated in a direction by a centrifugal force, said matrix and fibers being closely bonded by sintering to form a fiber-reinforced compact sintered body of silicon nitride, wherein the ceramic fibers are selected from the group consisting of fibers of alumina, silicon nitride, silicon carbide, carbon, potassium titanate and zirconium oxide and mixtures thereof.
Claim 3
Dependent Claim
13 words
The ceramic compact of claim 1, wherein the ceramic fibers are ceramic whiskers.
Claim 4
Dependent Claim
14 words
The ceramic compact of claim 2, wherein the ceramic whiskers are silicon carbide whiskers.
Claim 5
Dependent Claim
55 words
The ceramic compact of claim 1, wherein at least one member selected from the group consisting of aluminum oxide, aluminum nitride, zirconium oxide, yttrium oxide, magnesium oxide, cerium oxide and lanthanum oxide and mixtures thereof is further contained in a proportion of 0.5 to 40% by weight based on the weight of the ceramic compact.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-18 | 1994-08-20 | 1995-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-18 | 1998-08-20 | 1999-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-18 | 2002-08-20 | 2003-02-19 | $7700.00 | Window Closed / Lapsed |