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US4889835A
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SiC-Al2 O3 composite sintered bodies and method of producing the same
Assignee: NGK Insulators Ltd
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Filing: 1988-09-20
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Granted: 1989-12-26
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Expires: 2008-09-20
Abstract
Abstract SiC-Al 2 O 3 composite sintered bodies having high strength and toughness are constructed by dispersing SiC particle and SiC whisker into a matrix of Al 2 Ohd 3 particles.
Inventors
- 👤 Koichi Niihara
- 👤 Atsushi Nakahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:02
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/101; C04B35/103; C04B35/50; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
66 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix phase consisting of Al 2 O 3 grains having a grain size of not greater than 5 μm; 2-20 mol% SiC grains having a grain size of not greater than 1 μm; and 2-20 mol% SiC whiskers having a diameter range of 0.5-5 μm and an aspect ratio of not less than 3.
Claim 2
Dependent Claim
66 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix phase consisting of Al 2 O 3 grains having a grain size of not greater than 5 μm; 2-20 mol% SiC grains having a grain size of not greater than 1 μm; and 2-20 mol% SiC whiskers having a diameter range of 0.5-5 μm and an aspect ratio of not less than 3.
Claim 3
Dependent Claim
19 words
The composite sintered body of claim 1, wherein said SiC whiskers are present in an amount of 5-15 mol%.
Claim 4
Dependent Claim
18 words
The composite sintered body of claim 1, wherein said SiC whiskers have a diameter range of 1-5 μm.
Claim 5
Dependent Claim
20 words
The composite sintered body of claim 1, wherein said Al 2 O 3 consists of α-Al 2 O 3 .
Claim 6
Dependent Claim
23 words
The composite sintered body of claim 1, wherein said sintered composite body has a three-point flexural strength of not less than 980 MPa.
Claim 7
Dependent Claim
26 words
The composite sintered body of claim 1, wherein said sintered composite body has a toughness (K IC ) of not less than 5.3 MPam 0 .5.
Claim 8
Dependent Claim
94 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix phase consisting of Al 2 O 3 grains having a grain size of not greater than 5 μm; 5-10 mol% SiC grains having a grain size of not greater than 1 ∞m; and 2-20 mol% SiC whiskers having a diameter range of 0.5-5 μm and an aspect ratio of not less than 3; wherein said body has a three-point flexural strength of not less than 980 MPa and a toughness (K IC ) of not less than 5.3 MPam 0 .5.
Claim 9
Dependent Claim
94 words
An SiC-Al 2 O 3 composite sintered body, consisting essentially of: a matrix phase consisting of Al 2 O 3 grains having a grain size of not greater than 5 μm; 5-10 mol% SiC grains having a grain size of not greater than 1 ∞m; and 2-20 mol% SiC whiskers having a diameter range of 0.5-5 μm and an aspect ratio of not less than 3; wherein said body has a three-point flexural strength of not less than 980 MPa and a toughness (K IC ) of not less than 5.3 MPam 0 .5.
Claim 10
Dependent Claim
20 words
The composite sintered body of claim 7, wherein said Al 2 O 3 consists of α-Al 2 O 3 .
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |