US5137774A
Expired / Lapsed
US
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Multi-oxide coated carbide body and method of producing the same
Assignee: Seco Tools AB
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Filing: 1990-07-13
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Granted: 1992-08-11
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Expires: 2010-07-13
Abstract
Abstract Improved properties of aluminum oxide wear layers on cemented carbides and related substrates can be obtained by combining the two alumina polymorphs (α-Al 2 O 3 and kappa-Al 2 O 3 ) as multilayers. The nucleation of α-Al 2 O 3 and particularly kappa-Al 2 O 3 can be controlled by means of modification layers. According to this invention, it is thus possible to CVD-deposit an oxide multicoating layer consisting of clearly specified layers of α-Al 2 O 3 and kappa-Al 2 O 3 . Preferably, α-Al 2 O 3 is deposited first by CVD on a TiC coated cemented carbide substrate followed by the said coating layer of kappa-Al 2 O 3 .
Inventors
- 👤 Sakari A. Ruppi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:11
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: 12
Claim 1
Independent Claim
154 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 plurality of layers, at least one of said layers consisting essentially of α-alumina and another of said layers consisting essentially of kappa-alumina wherein a kappa-modification layer is disposed between the α-alumina and kappa-alumina layers, said kappa-modification layer being (Al x Ti y )(O 2 C z ) wherein y:x=2-4 and z:w=0.6-0.8, the total thickness of the modification layer being less than 20% of the total thickness of the coating, wherein the α-alumina layer has a thickness of from 2-15 μm and the kappa-alumina layer has a thickness of from 1-6 μm, and the substrate has a layer of carbide, nitride, carbooxynitride, 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 an alumina layer.
Claim 2
Dependent Claim
154 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 plurality of layers, at least one of said layers consisting essentially of α-alumina and another of said layers consisting essentially of kappa-alumina wherein a kappa-modification layer is disposed between the α-alumina and kappa-alumina layers, said kappa-modification layer being (Al x Ti y )(O 2 C z ) wherein y:x=2-4 and z:w=0.6-0.8, the total thickness of the modification layer being less than 20% of the total thickness of the coating, wherein the α-alumina layer has a thickness of from 2-15 μm and the kappa-alumina layer has a thickness of from 1-6 μm, and the substrate has a layer of carbide, nitride, carbooxynitride, 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 an alumina layer.
Claim 3
Dependent Claim
16 words
The coated sintered cemented carbide of claim 1 wherein the kappa-alumina layer overlies the α-alumina layer.
Claim 4
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 5
Dependent Claim
24 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 6
Dependent Claim
34 words
The coated sintered cemented carbide of claim 1 wherein there is a plurality of layers of kappa-alumina or α-alumina with a kappa-modification layer dispersed between each layer of α-alumina and a layer of kappa-alumina.
Claim 7
Dependent Claim
16 words
A method of cutting cast iron using the coated sintered cemented carbide body of claim 1.
Claim 8
Dependent Claim
162 words
A coated sintered cemented carbide having a substrate containing at least one metal carbide and a binder metal and a coating having a plurality of layers, at least one layer consisting essentially of α-alumina and at least one other layer consisting essentially of kappa-alumina the improvement wherein the outermost operative layer consists essentially of kappa-alumina, wherein a kappa-modification layer is disposed between the α-alumina and kappa-alumina layers, said kappa-modification layer being (Al x Ti y )(O w C z ) wherein y:x=2-4 and z:w=0.6-0.8, the total thickness of the modification layer being less than 20% of the total thickness of the coating, the α-alumina layer has a thickness of from 2-15 μm and the kappa-alumina layer has a thickness of from 1-6 μm, and the substrate has a layer of carbide, nitride, carbooxynitride, 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 an alumina layer.
Claim 9
Dependent Claim
162 words
A coated sintered cemented carbide having a substrate containing at least one metal carbide and a binder metal and a coating having a plurality of layers, at least one layer consisting essentially of α-alumina and at least one other layer consisting essentially of kappa-alumina the improvement wherein the outermost operative layer consists essentially of kappa-alumina, wherein a kappa-modification layer is disposed between the α-alumina and kappa-alumina layers, said kappa-modification layer being (Al x Ti y )(O w C z ) wherein y:x=2-4 and z:w=0.6-0.8, the total thickness of the modification layer being less than 20% of the total thickness of the coating, the α-alumina layer has a thickness of from 2-15 μm and the kappa-alumina layer has a thickness of from 1-6 μm, and the substrate has a layer of carbide, nitride, carbooxynitride, 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 an alumina layer.
Claim 10
Dependent Claim
27 words
A coated sintered cemented carbide of claim 1 wherein the total thickness of the modification layer is less than 10% of the total thickness of the coating.
Claim 11
Dependent Claim
27 words
A coated sintered cemented carbide of claim 5 wherein the total thickness of the modification layer is less than 20% of the total thickness of the coating.
Claim 12
Dependent Claim
27 words
A coated sintered cemented carbide of claim 9 wherein the total thickness of the modification layer is less than 10% of the total thickness of the coating.
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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) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |