US4089682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cobalt-base sintered alloy
Assignee: Mitsubishi Materials Corp
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Filing: 1976-11-24
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Granted: 1978-05-16
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Expires: 1996-11-24
Abstract
Abstract A cobalt-base sintered alloy which comprises: being manufactured from a reduced powder by the conventional powder metallurgy process with said reduced powder as a material powder, said reduced powder being prepared by simultaneously reducing a mixed powder consisting of powders of oxides of elements constituting said sintered alloy with a carbon powder added and mixed therein, and said reduced powder consisting of powders of said constituent elements and powders of carbides thereof; and consisting essentially of, in weight percentage:
Inventors
- 👤 Yuichi Saito
- 👤 Osamu Mayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:15
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
159 words
A cobalt-base sintered alloy having a density of at least 95 percent of the theoretical density thereof, and consisting essentially of, in weight percentage: chromium from 15.0 to 35.0 tungsten from 3.0 to 19.0 nickel from 0.2 to 12.0 molybdenum from 0.1 to 15.0 iron from 0.05 to 5.00 titanium from 0.05 to 2.00 silicon from 0.05 to 1.50 manganese from 0.05 to 1.00 carbon from 0.2 to 3.5 and the balance cobalt and incidental impurities; said cobalt-based sintered alloy being prepared by sintering a reduced powder mixture consisting of said metals and carbides of said metals, said reduced powder mixture being prepared by the steps comprising simultaneously reducing a mixed powder consisting essentially of powders of oxides of elements constituting said sintered alloy and carbon powder to produce a reduced sponge-like mass, and pulverizing said reduced sponge-like mass to obtain said reduced powder mixture; said alloy and said reduced powder mixture having substantially the same elemental chemical composition.
Claim 2
Dependent Claim
159 words
A cobalt-base sintered alloy having a density of at least 95 percent of the theoretical density thereof, and consisting essentially of, in weight percentage: chromium from 15.0 to 35.0 tungsten from 3.0 to 19.0 nickel from 0.2 to 12.0 molybdenum from 0.1 to 15.0 iron from 0.05 to 5.00 titanium from 0.05 to 2.00 silicon from 0.05 to 1.50 manganese from 0.05 to 1.00 carbon from 0.2 to 3.5 and the balance cobalt and incidental impurities; said cobalt-based sintered alloy being prepared by sintering a reduced powder mixture consisting of said metals and carbides of said metals, said reduced powder mixture being prepared by the steps comprising simultaneously reducing a mixed powder consisting essentially of powders of oxides of elements constituting said sintered alloy and carbon powder to produce a reduced sponge-like mass, and pulverizing said reduced sponge-like mass to obtain said reduced powder mixture; said alloy and said reduced powder mixture having substantially the same elemental chemical composition.
Claim 3
Dependent Claim
40 words
The cobalt-base sintered alloy as claimed in claim 1, consisting essentially of, in weight percentage: chromium 31.0 tungsten 12.0 nickel 2.0 molybdenum 1.0 iron 2.0 titanium 0.1 silicon 0.5 manganese 0.5 carbon 2.4 and the balance cobalt and incidental impurities.
Claim 4
Dependent Claim
42 words
The cobalt-base sintered alloy as claimed in claim 1, consisting essentially of, in weight percentage: chromium 31.0 tungsten 12.0 nickel 2.0 molybdenum 1.0 iron 2.0 titanium 0.1 silicon 0.5 manganese 0.5 carbon 2.4 boron 0.5 and the balance cobalt and incidental impurities.
Claim 5
Dependent Claim
19 words
The cobalt-base sintered alloy as claimed in claim 1, also containing, in weight percentage, from 0.05 to 1.00 boron.
References Cited (Backward Citations)
US2853767A
Cited
US3096174A
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US3194468A
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US3510292A
Cited
US3326676A
Cited
US3578443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |