US4481034A
Expired / Lapsed
US
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Process for producing high hafnium carbide containing alloys
Assignee: Massachusetts Institute of Technology
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Filing: 1982-09-13
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Granted: 1984-11-06
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Expires: 2002-09-13
Abstract
Abstract Disclosed is a process for forming a new group of cobalt-based alloys containing 3-18% hafnium carbide (HfC), the HfC having a particle size finer than about three microns. The class of alloys exhibits excellent tensile strength characteristics at very low temperatures, exhibits very good time-temperature stability, and shows excellent oxidation characteristics even at temperatures above about 1000° C. In addition, the alloy is attractive for use in the wrought state because of its ductility and low-temperature toughness characteristics.
Inventors
- 👤 Nicholas J. Grant
- 👤 Ramon K. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:17
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
41 words
An alloy product comprising: A. 10-30 weight percent chromium; B. 4-12 weight percent tungsten and/or molybdenum; C. 2-24 volume percent hafnium carbide having a particle size of less than 3 microns; and, D. the balance being a cobalt solid solution matrix.
Claim 2
Dependent Claim
41 words
An alloy product comprising: A. 10-30 weight percent chromium; B. 4-12 weight percent tungsten and/or molybdenum; C. 2-24 volume percent hafnium carbide having a particle size of less than 3 microns; and, D. the balance being a cobalt solid solution matrix.
Claim 3
Dependent Claim
36 words
An alloy product as claimed in claim 1 wherein up to 40% of said cobalt solid solution matrix is replaced by a solid solution matrix chosen from a group consisting of nickel and a nickel-iron mixture.
Claim 4
Dependent Claim
22 words
An alloy product as claimed in claim 1 wherein the secondary dendritic arm spacing is in the order of 10 -1 microns.
References Cited (Backward Citations)
US3598567A
Cited
US4084964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |