US4629661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cutting insert and method of making the same
Assignee: Santrade Ltd
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Filing: 1985-06-18
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Granted: 1986-12-16
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Expires: 2005-06-18
Abstract
Abstract The wear resistance and toughness of a coated ceramic insert comprising a ceramic substrate and at least one thin surface layer of ceramic oxide is improved by applying at least one thin intermediate layer of hard borides of the subgroups or of the III-V groups of the periodic table, or of hard yttrium compounds. The layers are deposited from a gaseous phase.
Inventors
- 👤 Lars H. Hillert
- 👤 Jan N. Lindstrom
- 👤 Anders G. Thelin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:57
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C16/00; C23C16/02; C23C16/0272; C23C16/22; C23C16/30; C23C16/32; C23C16/34; C23C16/36; C23C16/38; C23C16/40; C23C16/403
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A cutting insert comprising: (a) a ceramic substrate comprised of a material selected from the group consisting of: (i) ceramic oxide and (ii) ceramic oxide mixed with at least one member selected from the group consisting of hard carbides, nitrides and binder metal; (b) at least one thin intermediate layer covering the substrate and comprised of at least one member selected from the group consisting of at least one hard boride of the subgroups of the III-V groups of the periodic table and hard yttrium compounds; and (c) at least one thin surface layer of ceramic oxide wherein said layers are deposited from a gaseous phase and have a mean grain size smaller than that of the substrate.
Claim 2
Dependent Claim
118 words
A cutting insert comprising: (a) a ceramic substrate comprised of a material selected from the group consisting of: (i) ceramic oxide and (ii) ceramic oxide mixed with at least one member selected from the group consisting of hard carbides, nitrides and binder metal; (b) at least one thin intermediate layer covering the substrate and comprised of at least one member selected from the group consisting of at least one hard boride of the subgroups of the III-V groups of the periodic table and hard yttrium compounds; and (c) at least one thin surface layer of ceramic oxide wherein said layers are deposited from a gaseous phase and have a mean grain size smaller than that of the substrate.
Claim 3
Dependent Claim
17 words
Cutting insert according to claim 1, characterized in that the intermediate layer is about 10A-10 μm thick.
Claim 4
Dependent Claim
24 words
Cutting insert according to claim 2 or 1, characterized in that the thickness of the surface layer is 0.5- 100 μm preferably 1-8 μm.
Claim 5
Dependent Claim
27 words
Cutting insert according to claim 3, characterized in that the surface layer comprises at least one oxide of Al, Zr, Si, Ca, Mg, Ti, Hf and Y.
Claim 6
Dependent Claim
20 words
Cutting insert according to claim 3, characterized in that the yttrium compounds comprise at least one of carbides and nitrides.
Claim 7
Dependent Claim
14 words
Cutting insert according to claim 3, characterized in that the substrate consists of sialon.
Claim 8
Dependent Claim
29 words
Cutting insert according to claim 2 or 1, characterized in that the surface layer comprises at least one oxide of Al, Zr, Si, Ca, Mg, Ti, Hf and Y.
Claim 9
Dependent Claim
20 words
Cutting insert according to claim 7, characterized in that the yttrium compounds comprise at least one of carbides and nitrides.
Claim 10
Dependent Claim
14 words
Cutting insert according to claim 7, characterized in that the substrate consists of sialon.
Claim 11
Dependent Claim
22 words
Cutting insert according to claim 2 or 1, characterized in that the yttrium compounds comprise at least one of carbides and nitrides.
Claim 12
Dependent Claim
14 words
Cutting insert according to claim 10, characterized in that the substrate consists of sialon.
Claim 13
Dependent Claim
16 words
Cutting insert according to claim 2 or 1, characterized in that the substrate consists of sialon.
Claim 14
Dependent Claim
88 words
A cutting insert comprising: (a) a ceramic sialon substrate; (b) at least one thin intermediate layer covering the ceramic sialon substrate and comprised of at least one member selected from the group consisting of at least one hard boride of the subgroups of the III-V groups of the periodic table and hard yttrium compounds; and (c) at least one thin surface layer of ceramic oxide wherein said layers are deposited from a gaseous phase and have a mean grain size smaller than that of the ceramic sialon substrate.
Claim 15
Dependent Claim
88 words
A cutting insert comprising: (a) a ceramic sialon substrate; (b) at least one thin intermediate layer covering the ceramic sialon substrate and comprised of at least one member selected from the group consisting of at least one hard boride of the subgroups of the III-V groups of the periodic table and hard yttrium compounds; and (c) at least one thin surface layer of ceramic oxide wherein said layers are deposited from a gaseous phase and have a mean grain size smaller than that of the ceramic sialon substrate.
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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) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |