US5057147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparation of WC-NI grade powder
Assignee: Osram Sylvania Inc
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Filing: 1990-06-15
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Granted: 1991-10-15
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Expires: 2010-06-15
Abstract
Abstract A method is disclosed for producing tungsten carbide-nickel powder which comprises forming a powder mixture consisting essentially of in percent by weight of about 0.1 to about 1.0 dimolybdenum carbide, about 1 to about 4 tungsten metal powder, about 80 to about 98% tungsten carbide and about 2 to about 20 nickel, wherein a sintered article produced from the powder has a relatively uniform microstructure.
Inventors
- 👤 Mary E. Shaffer
- 👤 Edward R. Kimmel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:11
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/06; C22C29/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A method for controlling the carbon content in tungsten carbide-nickel powder, said method comprising forming a powder mixture consisting essentially of, in percent by weight, about 0.1 to about 1.0 dimolybdenum carbide, about 1 to about 4 tungsten metal powder, about 80 to about 98 tungsten carbide and about 2 to about 20 nickel, and vacuum sintering a compacted article at 1460° C. having a relatively uniform microstructure and absence of exaggerated grain growth.
Claim 2
Independent Claim
74 words
A method for controlling the carbon content in tungsten carbide-nickel powder, said method comprising forming a powder mixture consisting essentially of, in percent by weight, about 0.1 to about 1.0 dimolybdenum carbide, about 1 to about 4 tungsten metal powder, about 80 to about 98 tungsten carbide and about 2 to about 20 nickel, and vacuum sintering a compacted article at 1460° C. having a relatively uniform microstructure and absence of exaggerated grain growth.
Claim 3
Dependent Claim
18 words
A method of claim 1 wherein said powder mixture contains about 6% to about 10% by weight nickel.
Claim 4
Dependent Claim
19 words
A method of claim 1 wherein said powder mixture contains about 0.2% to about 0.8% by weight dimolybdenum carbide.
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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) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |