US4282289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing coated cemented carbide product and resulting product
Assignee: Santrade Ltd
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Filing: 1980-04-16
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Granted: 1981-08-04
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Expires: 2000-04-16
Abstract
Abstract An improved process for the production of coated cemented carbide products is disclosed. A cemented carbide substrate is treated to form a metal carbide, nitride or carbonitride coating. During the last part of this treatment or subsequent thereto, a sulfur-and/or nitrogen-containing gas is added to the atmosphere to form a sulfide-and/or nitride - containing layer on the coating. Thereafter, a wear-resistant oxide (e.g., aluminum oxide) coating is applied to form the improved coated cemented carbide product.
Inventors
- 👤 Gregor H. Kullander
- 👤 Christopher G. Chatfield
- 👤 Marian Mikus
- 👤 Bo K. Westergren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:17
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/32; C23C16/34; C23C16/36; C23C16/40; C23C16/403; C23C30/00; C23C30/005; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
134 words
Method of treating a cemented carbide substrate containing at least one carbide together with binder metal in order to improve its wear resistance and utility, which method consists essentially of: (a) treating the substrate in an atmosphere selected from carbide, nitride and carbonitride forming atmospheres to form or apply a coating essentially consisting of at least one coat of at least one member selected from the group consisting of carbides, nitrides and carbonitrides of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si and B; (b) adding a sulfur-and/or nitrogen containing gas at the end of or at a period during the treatment of step (a) to form a sulfide and/or nitride portion on said coating; and (c) applying a wear resistant oxide coating on the thus pretreated cemented carbide substrate.
Claim 2
Dependent Claim
134 words
Method of treating a cemented carbide substrate containing at least one carbide together with binder metal in order to improve its wear resistance and utility, which method consists essentially of: (a) treating the substrate in an atmosphere selected from carbide, nitride and carbonitride forming atmospheres to form or apply a coating essentially consisting of at least one coat of at least one member selected from the group consisting of carbides, nitrides and carbonitrides of the elements Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Si and B; (b) adding a sulfur-and/or nitrogen containing gas at the end of or at a period during the treatment of step (a) to form a sulfide and/or nitride portion on said coating; and (c) applying a wear resistant oxide coating on the thus pretreated cemented carbide substrate.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein the treated cemented carbide substrate is heat treated by a further step (d) at a temperature close to or greater than the melting point of the binder metal phase prior to step (c).
Claim 4
Dependent Claim
52 words
The method of claim 2, wherein the treatment of the substrate according to the steps (a), (b)+(d) is performed as one operation, in which the member of the metals of the substrate forming the carbide, nitride and carbonitride is brought to diffuse from the interior of the substrate out to the surface.
Claim 5
Independent Claim
38 words
The method of claims 2 or 3, wherein at least part of the binder metal which has diffused to the outermost part of the surface coating during the heat treatment step is removed by means of selective etchants.
Claim 6
Dependent Claim
18 words
The method of claim 4, wherein the selective etchant is a mixture of HCl and H 2 .
Claim 7
Dependent Claim
8 words
The product of the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-03 | 1985-02-02 | 1985-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-03 | 1989-02-02 | 1989-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-03 | 1993-02-02 | 1993-08-04 | $7700.00 | Window Closed / Lapsed |