US5543176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
CVD of Al2 O3 layers on cutting inserts
Assignee: Sandvik Intellectual Property AB
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Filing: 1993-09-30
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Granted: 1996-08-06
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Expires: 2013-09-30
Abstract
Abstract The present invention relates to a method for coating a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected form the groups IVB, VB or VIB of the Periodic Table, the method comprising subjecting the insert to chemical vapor deposition and coating the insert with an epitaxial kappa-Al2O3 layer by the hydrolysis reaction of AlCl3, H2 and CO2, the hydrolysis reaction being carried out while maintaining the content of water vapor in the gas phase during nucleation of Al2O3 at less than 5 ppm.
Inventors
- 👤 Christopher G. Chatfield
- 👤 Jan N. Lindstrom
- 👤 Mats E. K. Sjostrand
- 👤 Ingrid K. M. Collin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:28
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/06; C23C10/14; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/403; C23C16/56; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
105 words
A method of coating a body adapted for a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected from the groups IVB, VB, or VIB of the Periodic Table, the method comprising subjecting the body to chemical vapor deposition and coating the body with an epitaxial kappa-Al 2 O 3 layer by the hydrolysis reaction of AlCl 3 , H 2 and CO 2 , the hydrolysis reaction being carried out while maintaining the content of water vapor in the as phase during nucleation of Al 2 O 3 at less than 5 ppm.
Claim 2
Independent Claim
105 words
A method of coating a body adapted for a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected from the groups IVB, VB, or VIB of the Periodic Table, the method comprising subjecting the body to chemical vapor deposition and coating the body with an epitaxial kappa-Al 2 O 3 layer by the hydrolysis reaction of AlCl 3 , H 2 and CO 2 , the hydrolysis reaction being carried out while maintaining the content of water vapor in the as phase during nucleation of Al 2 O 3 at less than 5 ppm.
Claim 3
Dependent Claim
17 words
The method of claim 1, wherein the water vapor during the nucleation is less than 0.5 ppm.
Claim 4
Dependent Claim
23 words
The method of claim 1, wherein after coating, the body is heat treated for 0.3-10 hours at 900°-1100° C. in a protective-gas atmosphere.
Claim 5
Dependent Claim
34 words
The method of claim 1, wherein the body includes a layer of titanium carbide and the Al 2 O 3 layer is deposited in contact with the titanium carbide layer during the coating step.
Claim 6
Dependent Claim
19 words
The method of claim 4, wherein the body comprises a cemented carbide substrate coated with the titanium carbide layer.
Claim 7
Dependent Claim
33 words
The method of claim 4, wherein the following lattice orientation relationship exists between the kappa-Al 2 O 3 and titanium carbide layers: (111)TiC//(0001)kappa-Al 2 O 3 [110] TiC//[0011] kappa-Al 2 O 3 .
Claim 8
Dependent Claim
13 words
The method of claim 1, wherein the body is a metal cutting insert.
Claim 9
Dependent Claim
18 words
The method of claim 4, wherein oxidation of the titanium carbide layer is prevented during the coating step.
Claim 10
Dependent Claim
27 words
The method of claim 1, further comprising heat treating the coated body and transforming the kappa-Al 2 O 3 layer to an alpha-Al 2 O 3 layer.
Claim 11
Dependent Claim
16 words
The method of claim 1, wherein the kappa-Al 2 O 3 layer is essentially pore free.
Claim 12
Dependent Claim
34 words
The method of claim 1, wherein the body includes a layer of titanium carbonitride and the Al 2 O 3 layer is deposited in contact with the titanium carbonitride layer during the coating step.
Claim 13
Independent Claim
101 words
A method of coating a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected from the groups IVB, VB or VIB of the Periodic Table, the method comprising subjecting the insert to chemical vapor deposition and coating the insert with an epitaxial kappa-Al 2 O 3 layer by the hydrolysis reaction of AlCl 3 , H 2 and CO 2 , the hydrolysis reaction being carried out while maintaining the content of water vapor in the gas phase during nucleation of Al 2 O 3 at less than 5 ppm.
Claim 14
Independent Claim
101 words
A method of coating a cutting insert having at least one layer of a carbide, carbonitride, oxynitride, oxycarbide, oxycarbonitride or nitride of one metal selected from the groups IVB, VB or VIB of the Periodic Table, the method comprising subjecting the insert to chemical vapor deposition and coating the insert with an epitaxial kappa-Al 2 O 3 layer by the hydrolysis reaction of AlCl 3 , H 2 and CO 2 , the hydrolysis reaction being carried out while maintaining the content of water vapor in the gas phase during nucleation of Al 2 O 3 at less than 5 ppm.
Claim 15
Dependent Claim
34 words
The method of claim 12, wherein the insert includes a layer of titanium carbide and the Al 2 O 3 layer is deposited in contact with the titanium carbide layer during the coating step.
Claim 16
Dependent Claim
18 words
The method of claim 13, wherein oxidation of the titanium carbide layer is prevented during the coating step.
Claim 17
Dependent Claim
36 words
The method of claim 13, wherein the following lattice orientation relationship exists between the kappa-Al 2 O 3 and titanium carbide layers: (111 ) TiC//(0001) kappa-Al 2 O 3 [110] TiC//[0010] kappa-Al 2 O 3 .
Claim 18
Dependent Claim
26 words
The method of claim 12, further comprising heat treating the insert and transforming the kappa-Al 2 O 3 layer to an alpha-Al 2 O 3 layer.
Claim 19
Dependent Claim
16 words
The method of claim 12, wherein the kappa-Al 2 O 3 layer is essentially pore free.
Claim 20
Dependent Claim
34 words
The method of claim 12, wherein the insert includes a layer of titanium carbonitride and the Al 2 O 3 layer is deposited in contact with the titanium carbonitride layer during the coating step.
Claim 21
Dependent Claim
23 words
The method of claim 12, wherein the water vapor content during the nucleation of Al 2 O 3 is less than 0.5 ppm.
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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) | 1999-08-06 | 2000-02-05 | 2000-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-06 | 2004-02-05 | 2004-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-06 | 2008-02-05 | 2008-08-06 | $7700.00 | Window Closed / Lapsed |