US4084964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High HfC-containing alloys
Assignee: Massachusetts Institute of Technology
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Filing: 1976-03-05
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Granted: 1978-04-18
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Expires: 1996-03-05
Abstract
Abstract A new class of cobalt-based alloys and the like containing hafnium carbide (HfC) of particle size finer than about 3 microns and containing HfC in the range 2 to 15% by volume. The class has good strength characteristics at both very high and very low temperatures, it exhibits very good stability, and it has excellent oxidation characteristics even at temperatures at 2000 DEG F and above. In addition, the alloy has ductility and low-temperature toughness characteristics that make it attractive for wrought processes.
Inventors
- 👤 Nicholas J. Grant
- 👤 Ramon K. Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:32
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; C22C32/0052
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A cobalt-based alloy having a uniform dispersion of extremely fine and stable microconstituent phases, that consists essentially of 10-30 weight % chromium, 4-12 weight % tungsten and/or molybdenum, hafnium carbide of particle size less than 3 microns and in the range 2 to 15% by volume, and the rest a ductile, tough, oxidation-resistant cobalt matrix and incidental impurities, all the Hf and the C in the alloy being in the form of HfC.
Claim 2
Dependent Claim
73 words
A cobalt-based alloy having a uniform dispersion of extremely fine and stable microconstituent phases, that consists essentially of 10-30 weight % chromium, 4-12 weight % tungsten and/or molybdenum, hafnium carbide of particle size less than 3 microns and in the range 2 to 15% by volume, and the rest a ductile, tough, oxidation-resistant cobalt matrix and incidental impurities, all the Hf and the C in the alloy being in the form of HfC.
Claim 3
Dependent Claim
23 words
A powder as claimed in claim 1 in which up to 30% of the cobalt is substituted by nickel or nickel plus iron.
Claim 4
Dependent Claim
21 words
A powder as claimed in claim 1 in which some of the cobalt is substituted by nickel or nickel plus iron.
Claim 5
Dependent Claim
20 words
A powder as claimed in claim 1 in which all the cobalt is substituted by nickel or nickel plus iron.
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) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |