Patent US4761339A successfully refreshed from Google Patents.
US4761339A
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Sintered ceramic articles and method for production thereof
Assignee: Toshiba Corp
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Filing: 1986-06-26
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Granted: 1988-08-02
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Expires: 2006-06-26
Abstract
Abstract Sintered ceramic articles and a method for the production thereof are disclosed. When a shaped Si 3 N 4 ceramic article is sintered in the presence of SiO 2 or a SiO 2 -containing substance in an inactive gas atmosphere, there is obtained a sintered ceramic article having the surface thereof coated with a thin layer formed preponderantly of silicon oxynitride (Si 2 N 2 O). The sintered ceramic article of this invention excels in resistance to elevated temperatures, particularly temperatures exceeding 1200° C., and enjoys a good surface condition.
Inventors
- 👤 Michiyasu Komatsu
- 👤 Isao Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B41/00; C04B41/009; C04B35/584; C04B35/593; C04B35/5935; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/5067; C04B41/80; C04B41/81; C04B41/85; C04B41/87
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
60 words
A sintered ceramic article having a smooth, thin reaction-formed surface layer preponderantly of silicon oxynitride (Si 2 N 2 O) formed on a surface of a sintered Si 3 N 4 article having a density of 3.0 gr/cm 3 or more, said silicon oxynitride being a reaction product of SiO 2 and Si 3 N 4 of said sintered article.
Claim 2
Dependent Claim
60 words
A sintered ceramic article having a smooth, thin reaction-formed surface layer preponderantly of silicon oxynitride (Si 2 N 2 O) formed on a surface of a sintered Si 3 N 4 article having a density of 3.0 gr/cm 3 or more, said silicon oxynitride being a reaction product of SiO 2 and Si 3 N 4 of said sintered article.
Claim 3
Dependent Claim
24 words
A sintered ceramic article according to claim 1, wherein said silicon oxynitride layer has a thickness in the range of 5 to 500 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |