US3954458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Degassing powder metallurgical products
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1973-11-12
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Granted: 1976-05-04
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Expires: 1993-11-12
Abstract
Abstract This invention relates to a method of degassing prealloyed aluminum powder or compacts formed therefrom wherein the metal products are degassed by being subjected to a temperature between 450 DEG and 850 DEG F at a pressure less than 10<->3 torr. The products of this process are characterized by high strength and fracture toughness and excellent corrosion resistance.
Inventors
- 👤 Sidney G. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/16; B22F1/00; B22F1/14; B22F1/142
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
In the method of forming products from prealloyed aluminum powder wherein prealloyed aluminum powder having a particle size less than 100 mesh is degassed, compacted to full density and then hot worked, the improvement comprising conducting said degassing at a temperature between 450° and 850° and at a pressure of less than 10 - 3 torr.
Claim 2
Dependent Claim
56 words
In the method of forming products from prealloyed aluminum powder wherein prealloyed aluminum powder having a particle size less than 100 mesh is degassed, compacted to full density and then hot worked, the improvement comprising conducting said degassing at a temperature between 450° and 850° and at a pressure of less than 10 - 3 torr.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said degassing temperature is maintained from about 600°-800°F.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein said pressure is less than 10 - 4 torr.
Claim 5
Dependent Claim
54 words
The method of claim 1 wherein said prealloyed aluminum powder is formed from an alloy consisting essentially of about 5 to 13% zinc, from about 0.5 to 4.5% magnesium, up to about 4.0% copper, up to about 3.0% cobalt, up to about 0.5% zirconium and the balance aluminum and inconsequential amounts of other elements.
Claim 6
Dependent Claim
9 words
The product formed by the method of claim 4.
Claim 7
Dependent Claim
75 words
In the method of forming products from prealloyed aluminum powder wherein prealloyed aluminum powder having a particle size less than 100 mesh is compacted into a green compact less than 90% of full density, and then degassed, and the degassed green compact is compacted to full density and then hot worked, the improvement comprising conducting said degassing at a temperature between 450° and 850°F and at a pressure of less than 10 - 3 torr.
Claim 8
Dependent Claim
75 words
In the method of forming products from prealloyed aluminum powder wherein prealloyed aluminum powder having a particle size less than 100 mesh is compacted into a green compact less than 90% of full density, and then degassed, and the degassed green compact is compacted to full density and then hot worked, the improvement comprising conducting said degassing at a temperature between 450° and 850°F and at a pressure of less than 10 - 3 torr.
Claim 9
Dependent Claim
26 words
The method of claim 6 wherein said prealloyed powder is first compacted into a green compact to about 50 to 85% of full density and degassed.
Claim 10
Dependent Claim
14 words
The method of claim 6 wherein said degassing temperature is maintained from about 600°-850°F.
Claim 11
Dependent Claim
24 words
The method of claim 6 wherein said prealloyed powder is compacted into a green compact to about 50-85% of full density and then degassed.
Claim 12
Dependent Claim
15 words
The method of claim 6 wherein said pressure is less than 10 - 4 torr.
Claim 13
Dependent Claim
50 words
The method of claim 6 wherein said prealloyed aluminum powder is formed from an alloy consisting essentially of about 5-13% zinc, from about 0.5-4.5% magnesium, up to about 4.0% copper, up to about 3.0% cobalt, up to about 0.5% zirconium and the balance aluminum and inconsequential amounts of other elements.
Claim 14
Dependent Claim
9 words
The product formed by the method of claim 9.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |