US5162147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kappa-alumina oxide coated carbide body and method of producing the same
Assignee: Sandvik AB
•
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 01:55
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.
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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) | 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 |