US3816080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically-alloyed aluminum-aluminum oxide
Assignee: Huntington Alloys Corp
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Filing: 1973-02-26
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Granted: 1974-06-11
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Expires: 1993-02-26
Abstract
Abstract A mechanically alloyed composite powder wherein individual particles include an aluminum matrix having equiaxed aluminum oxide dispersoid particles having a size of about 100A to 2,000A uniformly distributed therethrough at particle spacings of about 500 to 3,000A. Products made by consolidating the mechanically alloyed powder exhibit improved strength properties at relatively low dispersoid contents. A process for producing such mechanically alloyed composite powder including milling under dry conditions and in the presence of a surfactive agent, preferably a volatilizable organic material.
Inventors
- 👤 M Bomford
- 👤 J Benjamin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:36
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0036; Y; Y10; Y10S; Y10S75/00; Y10S75/95; Y10S75/951; Y10S75/956; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
29 words
The mechanically alloyed composite powder defined in claim 1, wherein said equi-axed dispersoid particles comprise at least about 80 percent of the total number of said aluminum oxide particles.
Claim 2
Dependent Claim
43 words
The mechanically alloyed composite powder defined in claim 1, wherein said equi-axed dispersoid particles are separated by an average interparticle spacing of about 500A to 3,000A, where the aluminum oxide content of said composite powder is less than about 6 weight per cent.
Claim 3
Dependent Claim
39 words
The mechanically alloyed composite powder defined in claim 1, wherein said aluminum constituent consists essentially of metallic aluminum and said individual particles are characterized by a hardness of at least about 60 kilograms per square millimeter Vickers Hardness Number.
Claim 4
Dependent Claim
125 words
An aluminum oxide dispersion-strengthened aluminum powder metallurgy product, said product being a substantially fully dense consolidated material prepared from a mechanically alloyed composite powder consisting essentially of aluminum and aluminum oxide, individual particles thereof comprising a matrix of said aluminum and dispersoid particles of said aluminum oxide distributed substantially uniformly throughout said matrix, said dispersoid particles being substantially equi-axed and substantially all of said substantially equi-axed dispersoid particles being smaller in diameter than about 2000 A, and said product when consolidated by extrusion being characterized in the as-extruded condition by a room temperature tensile strength of at least about 45,000 pounds per square inch, the content of said aluminum oxide in said product being at least about 2.5 up to about 10 weight per cent.
Claim 5
Dependent Claim
41 words
The powder metallurgy product defined in claim 5, wherein said product is further characterized by a room temperature tensile strength of at least about 50,000 p.s.i. where said content of said aluminum oxide is greater than about 4 weight per cent.
Claim 6
Dependent Claim
63 words
A powder metallurgy product according to claim 5, wherein said aluminum constituent consists essentially of metallic aluminum, said product having a carbon content of less that about 0.5 weight per cent and an aluminum oxide content less than about 5 weight percent, said product having an electrical conductivity of at least about 57 percent I.A.C.S. and being especially suitable for electrical conductor applications.
Claim 7
Dependent Claim
54 words
An aluminum oxide dispersion-strengthened aluminum powder metallurgy product as defined in claim 5, further comprising less than about 0.5 weight per cent carbon and less than about 5 weight per cent aluminum oxide dispersoid, said product being further characterized by being readily workable to sheet or wire form without the necessity of intermediate annealing.
Claim 8
Dependent Claim
25 words
The powder metallurgy product defined in claim 8, wherein said product can be cold drawn to a true strain value of at least about 5.
Claim 9
Dependent Claim
43 words
The powder metallurgy product defined in claim 5, wherein said aluminum oxide content is below 6 weight per cent and said product is further characterized by a rupture life of 100 hours at a stress of at least about 12,000 p.s.i. at 600*F.
Claim 10
Dependent Claim
43 words
The powder metallurgy product defined in claim 5, wherein said aluminum oxide content is below 6 weight per cent and said product is further characterized by a rupture life of 100 hours at a stress of at least about 8,000 p.s.i. at 800*F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |