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Patent US4310499A successfully refreshed from Google Patents.
US4310499A
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Process for producing SIALON sintered product
Assignee: National Institute for Materials Science
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Filing: 1980-12-12
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Granted: 1982-01-12
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Expires: 2000-12-12
Abstract
Abstract SIALON sintered product having the formula Si6-zAlzOzN8-z (z is 0 to 4.2) is produced by sintering a molded product of the starting materials for SIALON in the condition of covering the surface of said molded product with a mixed powder of Si3N4 and SiO2 as main components in nitrogen gas atmosphere.
Inventors
- 👤 Mamoru Mitomo
- 👤 Nobuyuki Kuramoto
- 👤 Yoshizo Inomata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/597
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
A process for producing SIALON sintered product having the formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (z is 0 to 4.2) which comprises sintering a molded product of the starting materials for SIALON selected from the group consisting of (i) a mixture of powdery components of Si 3 N 4 , Al 2 O 3 and AlN; and (ii) a mixture of powdery components of Si 3 N 4 , SiO 2 and AlN; in the condition of covering the surface of said molded product with a mixed powder consisting essentially of Si 3 N 4 and SiO 2 in nitrogen gas atmosphere.
Claim 2
Dependent Claim
101 words
A process for producing SIALON sintered product having the formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (z is 0 to 4.2) which comprises sintering a molded product of the starting materials for SIALON selected from the group consisting of (i) a mixture of powdery components of Si 3 N 4 , Al 2 O 3 and AlN; and (ii) a mixture of powdery components of Si 3 N 4 , SiO 2 and AlN; in the condition of covering the surface of said molded product with a mixed powder consisting essentially of Si 3 N 4 and SiO 2 in nitrogen gas atmosphere.
Claim 3
Dependent Claim
31 words
The process according to claim 1, wherein the mixed powder consists essentially of 5 to 80 wt.% of SiO 2 and 20 to 95 wt.% of Si 3 N 4 .
Claim 4
Dependent Claim
118 words
A process for producing SIALON sintered product having the formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (z is 0 to 4.2) which comprises sintering a molded product of the starting materials for SIALON selected from the group consisting of (i) a mixture of powdery components of Si 3 N 4 , Al 2 O 3 and AlN; and (ii) a mixture of powdery components of Si 3 N 4 , SiO 2 and AlN; in the condition of covering the surface of said molded product with a mixed powder consisting essentially of Si 3 N 4 and SiO 2 , as main components, and Al 2 O 3 , Si, SiC or Si 2 N 2 O as minor component.
Claim 5
Dependent Claim
118 words
A process for producing SIALON sintered product having the formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z (z is 0 to 4.2) which comprises sintering a molded product of the starting materials for SIALON selected from the group consisting of (i) a mixture of powdery components of Si 3 N 4 , Al 2 O 3 and AlN; and (ii) a mixture of powdery components of Si 3 N 4 , SiO 2 and AlN; in the condition of covering the surface of said molded product with a mixed powder consisting essentially of Si 3 N 4 and SiO 2 , as main components, and Al 2 O 3 , Si, SiC or Si 2 N 2 O as minor component.
Claim 6
Dependent Claim
23 words
The process according to claim 1, 2 or 3, wherein the sintering temperature is in a range of 1700° C. to 1850° C.
References Cited (Backward Citations)
US3991148A
Cited
US4147759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |