Patent US4837231A successfully refreshed from Google Patents.
US4837231A
Expired / Lapsed
US
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Sintered non-oxide ceramic composite
Assignee: Nippon Steel Corp
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Filing: 1987-04-30
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Granted: 1989-06-06
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Expires: 2007-04-30
Abstract
Abstract A sintered non-oxide ceramic composite high in density, high-temperature strength and toughness and having optionally and widely changeable electrical conductivity is obtained by compacting and sintering a mixed powder comprising 5-95% by weight of at least one compound selected from titanium carbide, nitride and carbonitride, 0.1-5% by weight (based on silicon carbide) of boron or boron compound in terms of boron, 0.1-5% by weight (based on silicon carbide) of carbon or carbon compound in terms of residual carbon and the balance of substantially silicon carbide.
Inventors
- 👤 Hidehiro Endo
- 👤 Kei Tanemoto
- 👤 Hiroshi Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/565; C04B35/58; C04B35/58007; C04B35/58014; C04B35/58021; C04B35/622; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A sintered non-oxide ceramic composite having a high density, high-temperature strength of at least 650 MPa of from room temperature to 1,500° C. and a toughness of greater than 5 MPam 1/2 and capable of having widely changeable electrical conductivity, which is produced by compacting and sintering a mixed powder which comprises 30-70% by weight of titanium carbide, 0.1-5% by weight of boron or boron compound on the basis of the weight of silicon carbide and, in terms of boron, 0.1-5% by weight of carbon or an organic carbon compound on the basis of the weight of silicon carbide, and in terms of residual carbon and the balance being substantially silicon carbide.
Claim 2
Dependent Claim
112 words
A sintered non-oxide ceramic composite having a high density, high-temperature strength of at least 650 MPa of from room temperature to 1,500° C. and a toughness of greater than 5 MPam 1/2 and capable of having widely changeable electrical conductivity, which is produced by compacting and sintering a mixed powder which comprises 30-70% by weight of titanium carbide, 0.1-5% by weight of boron or boron compound on the basis of the weight of silicon carbide and, in terms of boron, 0.1-5% by weight of carbon or an organic carbon compound on the basis of the weight of silicon carbide, and in terms of residual carbon and the balance being substantially silicon carbide.
Claim 3
Dependent Claim
18 words
A sintered body according to claim 1, which has a density of at least 85% of theoretical value.
Claim 4
Dependent Claim
48 words
A sintered body according to claim 1, wherein the amount of boron or boron compond is 0.3-3% by weight of silicon carbide and in terms of boron and that of carbon or organic carbon compound is 0.3-3% by weight of silicon carbide and in terms of residual carbon.
Claim 5
Dependent Claim
27 words
A sintered body according to claim 1, wherein the silicon carbide powder is a crystalline α-type powder, α-type powder, a mixed powder thereof or an amorphous powder.
Claim 6
Dependent Claim
23 words
A sintered body powder according to claim 6, wherein the silicon carbide powder has an average particle size of 10 μm or less.
Claim 7
Dependent Claim
22 words
A sintered body according to claim 7, wherein the silicon carbide powder has an average particle size of 1 μm or less.
Claim 8
Dependent Claim
32 words
A sintered body according to claim 1, wherein boron or boron compound is at least one member selected from the group consisting of metallic boron, boron carbide, boron nitride and boron oxide.
Claim 9
Dependent Claim
23 words
A sintered body according to claim 1, wherein carbon or organic carbon compound is an organic material which provides residual carbon when sintered.
Claim 10
Dependent Claim
28 words
A sintered body according to claim 10, wherein the organic carbon material is carbon black, acetylene black, phenolic resin, polyvinyl alcohol, corn starch, sugars or coal tar pitch.
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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) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |