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US4292049A
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Ceramic materials for high-speed cutting
Assignee: Niterra Co Ltd
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Filing: 1980-05-27
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Granted: 1981-09-29
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Expires: 2000-05-27
Abstract
Abstract Ceramic materials for use in high-speed cutting, comprising Al 2 O 3 , ZrO 2 and at least one alkali earth oxide selected from CaO and MgO, the weight ratio of Al 2 O 3 /ZrO 2 is in the range from about 95/5 to 99.5/0.5, the molar ratio of (CaO+MgO)/ZrO 2 is in the range from about 0.05/1 to 0.2/1, and at least 50% of the ZrO 2 in the material is cubic ZrO 2 , and the remainder is monoclinic ZrO 2 .
Inventors
- 👤 Hiroshi Tanaka
- 👤 Osamu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
92 words
A ceramic material for high-speed cutting consisting essentially of Al 2 O 3 , ZrO 2 and at least one alkaline earth metal oxide selected from the group consisting of CaO and MgO, wherein the weight ratio of Al 2 O 3 /ZrO 2 is in the range of from 95/5 to 99.5/0.5, the molar ratio of (CaO+MgO)/ZrO 2 is in the range of from 0.05/1 to 0.2/1, and at least 50% of the ZrO 2 in the material is cubic ZrO 2 , and the remainder is monoclinic ZrO 2 .
Claim 2
Dependent Claim
92 words
A ceramic material for high-speed cutting consisting essentially of Al 2 O 3 , ZrO 2 and at least one alkaline earth metal oxide selected from the group consisting of CaO and MgO, wherein the weight ratio of Al 2 O 3 /ZrO 2 is in the range of from 95/5 to 99.5/0.5, the molar ratio of (CaO+MgO)/ZrO 2 is in the range of from 0.05/1 to 0.2/1, and at least 50% of the ZrO 2 in the material is cubic ZrO 2 , and the remainder is monoclinic ZrO 2 .
Claim 3
Dependent Claim
19 words
A ceramic material for high-speed cutting as in claim 1 wherein the alkaline earth metal oxide consists of CaO.
Claim 4
Dependent Claim
19 words
A ceramic material for high-speed cutting as in claim 1 wherein the alkaline earth metal oxide consists of MgO.
Claim 5
Dependent Claim
42 words
A ceramic material for high-speed cutting as in claim 1 wherein the weight ratio of Al 2 O 3 /ZrO 2 is in the range of from 97/3 to 98/2 and (CaO+MgO)/ZrO 2 is in the range of from 0.08/1 to 0.1/1.
References Cited (Backward Citations)
US3862846A
Cited
US3871891A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-28 | 1985-03-30 | 1985-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-28 | 1989-03-30 | 1989-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-28 | 1993-03-30 | 1993-09-29 | $7700.00 | Window Closed / Lapsed |