EP0113660A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Nitride based cutting tool
Assignee: Niterra Co Ltd
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Filing: 1984-01-03
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Granted: —
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Expires: 2004-01-03
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 atone or a mixture of AIN and Al 2 O 3 , said mixture comprising from 5 to 65% by weight AIN, and the weight ratio of (1) at last one of Y 2 0 3 and Dy 2 O 3 to (2) Al 2 O 3 alone or the AIN and Al 2 O 3 mixture being 3:1 to 1:3.
Inventors
- 👤 Hiroshi C/O Ngk Spark Plug Co. Ltd. Tanaka
- 👤 Hidetoshi C/O Ngk Spark Plug Co. Ltd. Baba
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:09
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: 7
Claim 1
Independent Claim
120 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 0 3 and D Y203 and (2) A1 2 0 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.
Claim 2
Dependent Claim
120 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 0 3 and D Y203 and (2) A1 2 0 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.
Claim 3
Dependent Claim
179 words
A nitride based ceramic cutting tool as in Claim 1, wherein the Si 3 N 4 , TiN, and a 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 containing from 5 to 60% by weight AIN, the weight ratio of (1) at least one of Y 2 O 3 and Dy 2 O 3 to (2) the AlN and Al 2 O 3 mixture being from 3:1 to 1:3, in amounts such that the amounts of Si 3 N 4 , TiN and sintering aid falls within the ranges defined by lines connecting point A (84% by weight Si 3N4 , 5% by weight TiN, 11% by weight the sintering aid), point B (55% by weight Si 3 N 4 , 5% by weight TiN, 40% by weight the sintering aid), and point C (55% by weight Si 3 N 4 , 34% by weight TiN, 11% by weight the sintering aid) in the triangular diagram of Fig. 1.
Claim 4
Dependent Claim
106 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 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 0 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 5
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 0 3 and Dy 2 O 3 and (2) Al 2 O 3 , the weight ratio of (1) at least one of Y 2 0 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 6
Dependent Claim
123 words
5 . 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, respective- l y, said sintering aid comprising (1) at least one of Y 2 0 3 and D y 2 0 3 and (2) a mixture of A1N 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 0 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 7
Dependent Claim
143 words
A nitride based ceramic cutting tool as in Claim 1, wherein the Si3N4, 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 A1N 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 A1N 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)
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