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US4474849A
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Coated hard alloys
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1982-09-17
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Granted: 1984-10-02
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Expires: 2002-09-17
Abstract
Abstract Coated hard alloys excellent in toughness and wear resistance comprise a substrate of hard alloy and at least one coating layer thereon, at least one of the coating layers being of amorphous alumina.
Inventors
- 👤 Naoji Fujimori
- 👤 Akira Doi
- 👤 Yasuhiro Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:51
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/26
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
27 words
A coated hard alloy comprising as a substrate a hard alloy and at least one coating layer thereon, said at least one coating layer being amorphous alumina.
Claim 2
Dependent Claim
27 words
A coated hard alloy comprising as a substrate a hard alloy and at least one coating layer thereon, said at least one coating layer being amorphous alumina.
Claim 3
Dependent Claim
55 words
The coated hard alloy as claimed in claim 1, wherein the hard alloy consists of at least one member selected from the group consisting of carbides, nitrides, carbonitrides and carboxynitrides of Group 4a, 5a and 6a elements of Periodic Table and solid solutions thereof, bonded by at least one member selected from iron group metals.
Claim 4
Dependent Claim
17 words
The coated hard alloy as claimed in claim 1, wherein the outermost layer consists of amorphous alumina.
Claim 5
Dependent Claim
24 words
The coated hard alloy as claimed in claim 1, wherein the thickness of the coating layer of amorphous alumina is 0.5 to 10 μm.
Claim 6
Dependent Claim
22 words
The coated hard alloy as claimed in claim 1, wherein the total thickness of the coating layers is 0.5 to 20 μm.
Claim 7
Dependent Claim
30 words
The coated hard alloy as claimed in claim 1, wherein the amorphous alumina is coated by at least one method of ion sputtering, ion plating, CVD and plasma CVD methods.
Claim 8
Dependent Claim
22 words
The coated hard alloy as claimed in claim 1, wherein the amorphous alumina is coated onto the substrate through an intermediate layer.
Claim 9
Dependent Claim
46 words
The coated hard alloy as claimed in claim 7, wherein the intermediate layer consists of at least one hard compound selected from the group consisting of carbides, carbonitrides, nitrides, borides and oxides of Group 4a, 5a and 6a elements of Periodic Table and solid solutions thereof.
Claim 10
Dependent Claim
39 words
The coated hard alloy as claimed in claim 7, wherein the intermediate layer consists of at least one hard compound selected from the group consisting of Si 3 N 4 , SiC, AlN, SiO 2 and B 4 C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |