US4478888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing refractory powder
Assignee: Osram Sylvania Inc
•
Filing: 1983-08-04
•
Granted: 1984-10-23
•
Expires: 2003-08-04
Abstract
Abstract In a process for producing a carbide grade powder mixture for making a cemented metal carbide, a mixture of metal carbide particles and wax is formed at a temperature above the melting point of the wax. The wax includes less than about 2 percent by weight of a wetting agent for reducing the surface tension of the wax when in water. The blended mixture including metal binder particles is milled with a liquid milling medium comprising water to substantially uniformly disperse the metal binder particles and to produce a slurry. The slurry is dried to remove the milling medium and produce a powder comprising particles of metal carbide, metal binder and wax.
Inventors
- 👤 Mary L. Benjamin
- 👤 Robert J. Dobbs
- 👤 Mary E. Shaffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:36
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/04; B22F1/00; B22F1/10; B22F1/108; B22F2998/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A process for producing a powder mixture of metal carbide particles, metal binder particles and wax suitable for making a cemented metal carbide comprising forming a mixture of metal carbide particles and wax at a temperature above the melting point of said wax, said metal carbide particles and wax being sufficiently mixed to form a blended mixture of wax and metal carbide particles, said wax including less than about 2 percent by weight of a wetting agent for reducing the surface tension of said wax in water, said said wetting agent having a melting point greater than room temperature, milling said blended mixture including metal binder particles with a liquid milling medium comprising water to substantially uniformly disperse said metal binder particles and to produce a slurry, said metal binder particles being added prior to or during milling, said wax being substantially insoluble in said liquid milling medium and produce a powder comprising particles of metal carbide, metal binder and wax.
Claim 2
Dependent Claim
161 words
A process for producing a powder mixture of metal carbide particles, metal binder particles and wax suitable for making a cemented metal carbide comprising forming a mixture of metal carbide particles and wax at a temperature above the melting point of said wax, said metal carbide particles and wax being sufficiently mixed to form a blended mixture of wax and metal carbide particles, said wax including less than about 2 percent by weight of a wetting agent for reducing the surface tension of said wax in water, said said wetting agent having a melting point greater than room temperature, milling said blended mixture including metal binder particles with a liquid milling medium comprising water to substantially uniformly disperse said metal binder particles and to produce a slurry, said metal binder particles being added prior to or during milling, said wax being substantially insoluble in said liquid milling medium and produce a powder comprising particles of metal carbide, metal binder and wax.
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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |