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US5162147A
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Kappa-alumina oxide coated carbide body and method of producing the same
Assignee: Sandvik AB
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Filing: 1990-07-13
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Granted: 1992-11-10
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Expires: 2010-07-13
Abstract
Abstract Improved properties of aluminum oxide water layers on cemented carbides and related substrates can be obtained by having the outermost alumina layer in the form of kappa-Al2O3 deposited on a kappa-modification layer.
Inventors
- 👤 Sakari A. Ruppi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:15
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/403; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A coated sintered cemented carbide body having a substrate containing at least one metal carbide and a binder metal and a coating having a layer consisting essentially of kappa-alumina having a thickness of from 1-6 μm overlaying a kappa-modification layer comprising [(Al,Ti)(O,C)](Al x Ti y )(O w C z ) wherein y:x=2-4 and z:w=0.6-0.8 and a thickness of less than 20% of the thickness of the kappa-alumina layer to facilitate the nucleation and growth of the said kappa-alumina wherein the substrate has a layer of carbide, nitride, carboxynitride, carbooxide or carbonitride of one or more of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Si and/or B between the substrate and the kappa-modification layer.
Claim 2
Dependent Claim
117 words
A coated sintered cemented carbide body having a substrate containing at least one metal carbide and a binder metal and a coating having a layer consisting essentially of kappa-alumina having a thickness of from 1-6 μm overlaying a kappa-modification layer comprising [(Al,Ti)(O,C)](Al x Ti y )(O w C z ) wherein y:x=2-4 and z:w=0.6-0.8 and a thickness of less than 20% of the thickness of the kappa-alumina layer to facilitate the nucleation and growth of the said kappa-alumina wherein the substrate has a layer of carbide, nitride, carboxynitride, carbooxide or carbonitride of one or more of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo W, Si and/or B between the substrate and the kappa-modification layer.
Claim 3
Dependent Claim
17 words
The coated sintered cemented carbide of claim 1 wherein the kappa-modification layer is from 0.05-0.5 μm thick.
Claim 4
Dependent Claim
25 words
The coated sintered cemented carbide of claim 1 wherein the coating has an outermost layer of titanium nitride having a thickness of 0.5 -2 μm.
Claim 5
Dependent Claim
17 words
The coated sintered cemented carbide of claim 1 wherein there is a plurality of layers of kappa-alumina.
Claim 6
Dependent Claim
14 words
A method of cutting steel using the coated sintered cemented carbide of claim 1.
Claim 7
Dependent Claim
41 words
The coated sintered cemented carbide of claim 4 wherein each layer of kappa-alumina is separated by a kappa-modification layer, the total thickness of the modification layers within the coating being less than 20% of the total thickness of the coating layer.
Claim 8
Dependent Claim
31 words
The coated sintered cemented arbide of claim 6 wherein the total thickness of the modification layers within the coating is less than 10% of the total thickness of the coating layer.
References Cited (Backward Citations)
US3640689A
Cited
US3836392A
Cited
USRE29420E
Cited
US4018631A
Cited
US4180400A
Cited
USRE31526E
Cited
US4239536A
Cited
US4619866A
Cited
US4357382A
Cited
USRE32111E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |