Patent US2540025A successfully refreshed from Google Patents.
US3977061A
Expired / Lapsed
US
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Cutting insert and method of making the same
Assignee: Sandvik AB
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Filing: 1974-09-10
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Granted: 1976-08-31
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Expires: 1994-09-10
Abstract
Abstract The wear resistance and toughness of a cutting insert comprising a ceramic oxide is improved by applying to it a thin surface layer of ceramic oxide, deposited from a gaseous phase, in which surface layer the grains have a size smaller than 1 micron and preferably smaller than 0.5 micron.
Inventors
- 👤 Jan Nils Lindstrom
- 👤 Fall Johan Olof William Ohlsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:12
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; B23P; B23P15/00; B23P15/28; B23P15/30; C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/34; C23C16/36; C23C16/40; C23C16/403; C23C16/405; C23C16/44; C23C16/448; C23C16/4488; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31; Y10T428/315
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A cutting insert for chip-forming machining said insert consisting of a sintered substrate of of at least one wear-resisting ceramic oxide or of wear-resisting ceramic oxide mixed with at least one hard carbide or nitride and binder metal, on which substrate is a wear-resisting ceramic oxide surface layer consisting of an oxide from of the group consisting of Al, Zr, Si, Ca, Mg, Ti and Hf, the surface layer having been deposited from a gaseous phase and having a thickness of 0.5-100 μm, its mean grain size being smaller than 1 μm and essentially smaller than is the mean grain size of the sintered substrate.
Claim 2
Dependent Claim
105 words
A cutting insert for chip-forming machining said insert consisting of a sintered substrate of of at least one wear-resisting ceramic oxide or of wear-resisting ceramic oxide mixed with at least one hard carbide or nitride and binder metal, on which substrate is a wear-resisting ceramic oxide surface layer consisting of an oxide from of the group consisting of Al, Zr, Si, Ca, Mg, Ti and Hf, the surface layer having been deposited from a gaseous phase and having a thickness of 0.5-100 μm, its mean grain size being smaller than 1 μm and essentially smaller than is the mean grain size of the sintered substrate.
Claim 3
Dependent Claim
65 words
A cutting insert according to claim 1, in which a thin and extremely fine-grained intermediate layer of a material is applied between the thin surface layer consisting of wear-resisting ceramic oxide and the essentially ceramic substrate, said intermediate layer consisting essentially of a member of the group consisting of carbides and nitrides of Ti. Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si and B.
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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) | 1979-08-31 | 1980-03-01 | 1980-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-31 | 1984-03-01 | 1984-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-31 | 1988-03-01 | 1988-08-31 | $7700.00 | Window Closed / Lapsed |