US4578087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitride based cutting tool and method for producing the same
Assignee: Niterra Co Ltd
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Filing: 1984-01-10
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Granted: 1986-03-25
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Expires: 2004-01-10
Abstract
Abstract A nitride based ceramic cutting tool is described comprising from 50 to 90% by weight Si 2 N 4 , from 5 to 45% by weight TiN, and from 5 to 45% by weight sintering aid, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) Al 2 O 3 alone or a mixture of AlN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AlN, and the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 alone or the AlN and Al 2 O 3 mixture being 3:1 to 1:3.
Inventors
- 👤 Hiroshi Tanaka
- 👤 Hidetoshi Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:07
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/597; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
217 words
A nitride based ceramic cutting tool comprising from 50 to 90% by weight Si 3 N 4 , from 5 to 45% by weight TiN and from 5 to 45% by weight a composite oxide sintering aid, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) Al 2 O 3 alone or a mixture of AlN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AlN, and the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 alone or the AlN and Al 2 O 3 mixture being 3:1 to 1:3, wherein the Si 3 N 4 , TiN and sintering aid comprise from 50 to 80%, from 10 to 45% and from 5 to 40% by weight, respectively said sintering aid comprising (1) at least one of Y 2 O 3 , and Dy 2 O 3 and (2) Al 2 O 3 , the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 being 3:1 to 1:3, further comprising a surface coating layer of Al 2 O 3 formed thereon.
Claim 2
Dependent Claim
217 words
A nitride based ceramic cutting tool comprising from 50 to 90% by weight Si 3 N 4 , from 5 to 45% by weight TiN and from 5 to 45% by weight a composite oxide sintering aid, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) Al 2 O 3 alone or a mixture of AlN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AlN, and the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 alone or the AlN and Al 2 O 3 mixture being 3:1 to 1:3, wherein the Si 3 N 4 , TiN and sintering aid comprise from 50 to 80%, from 10 to 45% and from 5 to 40% by weight, respectively said sintering aid comprising (1) at least one of Y 2 O 3 , and Dy 2 O 3 and (2) Al 2 O 3 , the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 being 3:1 to 1:3, further comprising a surface coating layer of Al 2 O 3 formed thereon.
Claim 3
Dependent Claim
136 words
A nitride based ceramic cutting tool as in claim 1, wherein the Si 3 N 4 , TiN, and said sintering aid comprise from 50 to 80%, from 10 to 40% and from 10 to 40% by weight, respectively, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) Al 2 O 3 , the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) Al 2 O 3 being 3:1 to 1:3, further comprising an inner surface coating layer of at least one of AlN and AlON or of at least one of TiC and TiN formed thereon and an outer surface coating layer of Al 2 O 3 formed on said inner surface coating layer.
Claim 4
Dependent Claim
118 words
A nitride based ceramic cutting tool as in claim 1, wherein the Si 3 N 4 , TiN and sintering aid comprise from 50 to 85%, from 10 to 45% and from 5 to 40% by weight, respectively, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) a mixture of AlN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AlN, the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) said AlN mixture being 3:1 to 1:3, further comprising a surface coating layer of Al 2 O 3 formed thereof.
Claim 5
Dependent Claim
147 words
A nitride based ceramic cutting tool as in claim 1, wherein the Si 3 N 4 , TiN and sintering aid comprise from 50 to 80%, from 10 to 40% and 10 to 40% by weight, respectively, said sintering aid comprising (1) at least one of Y 2 O 3 and Dy 2 O 3 and (2) a mixture of AlN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AlN, the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) said mixture being 3:1 to 1:3, further comprising an inner surface coating layer of at least one of AlN and AlON or of at least one of TiN and TiC formed thereon and an outer surface coating layer of Al 2 O 3 formed on said inner surface coating layer.
References Cited (Backward Citations)
US3955038A
Cited
JPS5231910A
Cited
US4216021A
Cited
JPS5585481A
Cited
JPS55116671A
Cited
JPS57205376A
Cited
US4440707A
Cited
EP0080711A1
Cited
JPS5895644A
Cited
JPS5895662A
Cited
US4442169A
Cited
US4421525A
Cited
US4449989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |