US4501786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated product with oxide wear layer
Assignee: Carboloy Inc
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Filing: 1984-01-25
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Granted: 1985-02-26
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Expires: 2004-01-25
Abstract
Abstract Improved adherence of oxide wear layers on hard metal or cemented carbide substrates is attained by providing a thin surface-oxidized bonding layer comprising a carbide or oxycarbide of at least one of tantalum, niobium or vanadium, optionally adding aluminum to the bonding layer, and finally providing an outer oxide wear layer.
Inventors
- 👤 Thomas E. Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:54
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
An article of manufacture comprising (i) a hard metal or cemented carbide substrate; (ii) an inner layer lying next to said substrate, said inner layer comprising a carbide, a nitride or a carbonitride of titanium, zirconium, hafnium, vanadium, columbium, tantalum, chromium, molybdenum or tungsten (iii) a surface-oxidized bonding layer adjacent the surface of said inner layer (ii), said bonding layer comprising at least one of the carbides or oxycarbides of tantalum, niobium and vanadium; and (iv) an oxide wear layer overlying said bonding layer (iii).
Claim 2
Dependent Claim
85 words
An article of manufacture comprising (i) a hard metal or cemented carbide substrate; (ii) an inner layer lying next to said substrate, said inner layer comprising a carbide, a nitride or a carbonitride of titanium, zirconium, hafnium, vanadium, columbium, tantalum, chromium, molybdenum or tungsten (iii) a surface-oxidized bonding layer adjacent the surface of said inner layer (ii), said bonding layer comprising at least one of the carbides or oxycarbides of tantalum, niobium and vanadium; and (iv) an oxide wear layer overlying said bonding layer (iii).
Claim 3
Dependent Claim
33 words
An article as defined in claim 1 wherein the substrate is a cemented carbide, inner layer (ii), is 1 to 10 microns thick and bonding layer (iii) is 0.1 to 0.5 microns thick.
Claim 4
Dependent Claim
36 words
An article as defined in claim 1 wherein bonding layer (iii) (a) contains aluminum, (b) includes a metal selected from iron, cobalt, nickel or a mixture thereof, or is (c) a combination of (a) and (b).
Claim 5
Dependent Claim
14 words
An article as defined in claim 1 wherein inner layer (ii) comprises titanium carbide.
Claim 6
Dependent Claim
15 words
An article as defined in claim 1 wherein oxide wear layer (iv) comprises aluminum oxide.
Claim 7
Dependent Claim
18 words
An article as defined in claim 1 wherein oxide wear layer (iv) is 0.5 to 20 microns thick.
References Cited (Backward Citations)
US4431431A
Cited
US4441894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |