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US5194201A
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Method of manufacturing high density silicon nitride sintered bodies
Assignee: NGK Insulators Ltd
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Filing: 1991-08-14
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Granted: 1993-03-16
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Expires: 2011-08-14
Abstract
Abstract A method of manufacturing silicon nitride sintered bodies comprising the steps of preparing a powder consisting essentially of 100 parts by weight of silicon nitride, 2˜15 parts by weight of a rare earth element, 0.5˜15 parts by weight of a Zr compound and 0.3˜5 parts by weight of SiC, molding the thus prepared powder and firing the resulting molding.
Inventors
- 👤 Shinichi Miwa
- 👤 Seiichi Asami
- 👤 Takehiro Kajihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:00
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
97 words
A method of manufacturing a silicon nitride sintered body comprising the steps of: preparing a powder of powdery raw materials consisting of 100 parts by weight of silicon nitride, 2-15 parts by weight of a rare earth element, 0.5-15 parts by weight of an Mg compound, 0.5-13 parts by weight of a Zr compound, 0.3-5 parts by weight of SiC having an average particle size of 0.2-0.5 μm, and a forming aid, each amount of the powdery raw materials being designated by converted oxide amounts; molding the prepared powder; and firing the resulting molding at atmospheric pressure.
Claim 2
Independent Claim
97 words
A method of manufacturing a silicon nitride sintered body comprising the steps of: preparing a powder of powdery raw materials consisting of 100 parts by weight of silicon nitride, 2-15 parts by weight of a rare earth element, 0.5-15 parts by weight of an Mg compound, 0.5-13 parts by weight of a Zr compound, 0.3-5 parts by weight of SiC having an average particle size of 0.2-0.5 μm, and a forming aid, each amount of the powdery raw materials being designated by converted oxide amounts; molding the prepared powder; and firing the resulting molding at atmospheric pressure.
Claim 3
Dependent Claim
29 words
The method of claim 1, wherein the rare earth element is selected from the group consisting of Y and another rare earth element substituted for a portion of Y.
Claim 4
Independent Claim
97 words
A method of manufacturing a silicon nitride sintered body comprising the steps of: preparing a powder of powdery raw materials consisting of 100 parts by weight of silicon nitride, 2-15 parts by weight of a rare earth element, 0.5-15 parts by weight of an Mg compound, 0.5-13 parts by weight of a Zr compound, 0.3-2.0 parts by weight of SiC having an average particle size of 0.2-0.5 μm, and a forming aid, each amount of the powdery raw materials being designated by converted oxide amounts; molding the prepared powder; and firing the resulting molding at atmospheric pressure.
Claim 5
Independent Claim
97 words
A method of manufacturing a silicon nitride sintered body comprising the steps of: preparing a powder of powdery raw materials consisting of 100 parts by weight of silicon nitride, 2-15 parts by weight of a rare earth element, 0.5-15 parts by weight of an Mg compound, 0.5-13 parts by weight of a Zr compound, 0.3-2.0 parts by weight of SiC having an average particle size of 0.2-0.5 μm, and a forming aid, each amount of the powdery raw materials being designated by converted oxide amounts; molding the prepared powder; and firing the resulting molding at atmospheric pressure.
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) | 1996-03-15 | 1996-09-14 | 1997-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-15 | 2000-09-14 | 2001-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-15 | 2004-09-14 | 2005-03-16 | $7700.00 | Window Closed / Lapsed |