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Patent US4526875A successfully refreshed from Google Patents.
US4526875A
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Ceramic material for cutting tools and process for the production thereof
Assignee: Niterra Co Ltd
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Filing: 1984-01-13
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Granted: 1985-07-02
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Expires: 2004-01-13
Abstract
Abstract Ceramic materials for cutting tools are described, comprising molding a powder mixture comprising (a) Al 2 O 3 , (b) TiN, and (c) at least one of ZrC, Zr, and ZrN, wherein component (a) constitutes between 25 and 80% of the total volume of the powder mixture and the volume ratio of component (c) to component (b) is 1/2 or less, and sintering the molded powder in vacuum or in an inert atmosphere. A process for production thereof is also described.
Inventors
- 👤 Yoshihiro Yamamoto
- 👤 Kenji Sakurai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/563; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/5607; C04B35/5622; C04B35/58; C04B35/58007; C04B35/58014; C04B35/622; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A ceramic material of high strength and sufficient thermal conductivity for a cutting tool consisting essentially of a sintered molded powder mixture consisting essentially of (a) Al 2 O 3 , (b) TiN, and (c) at least one of ZrC, Zr, and ZrN, wherein component (a) constitutes between 25 and 65% of the total volume of the powder mixture and the volume ratio of component (c) to component (b) is 1/2 or less.
Claim 2
Dependent Claim
73 words
A ceramic material of high strength and sufficient thermal conductivity for a cutting tool consisting essentially of a sintered molded powder mixture consisting essentially of (a) Al 2 O 3 , (b) TiN, and (c) at least one of ZrC, Zr, and ZrN, wherein component (a) constitutes between 25 and 65% of the total volume of the powder mixture and the volume ratio of component (c) to component (b) is 1/2 or less.
Claim 3
Dependent Claim
30 words
A ceramic material as in claim 1, wherein component (a) constitutes from 30 to 65% of the total volume of the molded powder and component (c) is ZrC or Zr.
Claim 4
Dependent Claim
25 words
A ceramic material as in claim 1 or 2, wherein the ceramic material is sintered at a temperature of from 1,600° C. to 1,700° C.
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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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |