US4018631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated cemented carbide product
Assignee: Carboloy Inc
•
Filing: 1975-06-12
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Granted: 1977-04-19
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Expires: 1995-06-12
Abstract
Abstract Improved adherence of oxide coatings on cemented carbide substrate containing tungsten and cobalt is attained by forming on the substrate a coating selected from carbide, nitride, carbonitride and mixtures thereof, diffusing tungsten and cobalt from the substrate into the coating, oxidizing said coating, and coating said oxidized coating with oxide wear layer.
Inventors
- 👤 Thomas E. Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:21
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/36; C23C16/32; C23C16/34; C23C16/40; C23C16/405; C23C30/00; C23C30/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
The process of pretreating cemented carbide substrate containing tungsten and cobalt for the reception of wear resistant oxide coatings which comprises a. treating the substrate in a first atmosphere selected from carbide, nitride and carbonitride forming atmospheres to form the corresponding coating of metal selected from titanium, tantalum, hafnium, zirconium, niobium and mixtures thereof on the substrate, b. firing the coated substrate in a second, nonreactive, atmosphere at a temperature greater than the melting point of the cobalt phase to diffuse tungsten and cobalt into said coating, and c. heating the product of (b) in a third, oxidizing, atmosphere to oxidize said coating.
Claim 2
Dependent Claim
103 words
The process of pretreating cemented carbide substrate containing tungsten and cobalt for the reception of wear resistant oxide coatings which comprises a. treating the substrate in a first atmosphere selected from carbide, nitride and carbonitride forming atmospheres to form the corresponding coating of metal selected from titanium, tantalum, hafnium, zirconium, niobium and mixtures thereof on the substrate, b. firing the coated substrate in a second, nonreactive, atmosphere at a temperature greater than the melting point of the cobalt phase to diffuse tungsten and cobalt into said coating, and c. heating the product of (b) in a third, oxidizing, atmosphere to oxidize said coating.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the temperature of treatment in said nonreactive atmosphere is over about 1300° C.
Claim 4
Dependent Claim
21 words
The process of claim 1 wherein the temperature of treatment in said nonreactive atmosphere ranges from about 1300° to 1500° C.
Claim 5
Dependent Claim
19 words
A process as in claim 1 wherein an oxide wear coating is superimposed on the pretreated cemented carbide substrate.
Claim 6
Dependent Claim
5 words
The product of claim 1.
Claim 7
Dependent Claim
5 words
The product of claim 4.
Claim 8
Dependent Claim
70 words
The process of treating cemented carbide substrate containing tungsten and cobalt to improve wear resistance which comprises a. forming on said substrate a coating comprising a material selected from carbide, nitride, carbonitride and mixtures thereof of metal selected from titanium, tantalum, hafnium, zirconium, niobium and mixtures thereof, b. diffusing tungsten and cobalt into said coating, c. oxidizing said coating, and d. coating said oxidized coating with an oxide wear layer.
Claim 9
Dependent Claim
70 words
The process of treating cemented carbide substrate containing tungsten and cobalt to improve wear resistance which comprises a. forming on said substrate a coating comprising a material selected from carbide, nitride, carbonitride and mixtures thereof of metal selected from titanium, tantalum, hafnium, zirconium, niobium and mixtures thereof, b. diffusing tungsten and cobalt into said coating, c. oxidizing said coating, and d. coating said oxidized coating with an oxide wear 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) | 1980-04-18 | 1980-10-18 | 1981-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-18 | 1984-10-18 | 1985-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-18 | 1988-10-18 | 1989-04-19 | $7700.00 | Window Closed / Lapsed |