US3963482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Large size aluminum particle containing aluminum oxide therein
Assignee: Alcoa Corp
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Filing: 1975-05-05
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Granted: 1976-06-15
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Expires: 1995-05-05
Abstract
Abstract Improved aluminum particulate suitable for powder metallurgy applications is produced by wet-milling particulate aluminum in an inert atmosphere in the presence of a predetermined amount of oxygen to thereby comminute the aluminum into finer particles while oxidizing the new surfaces of such particles and then, after the supply of oxygen is exhausted, welding together such particles by further milling to provide a larger aluminum particle having aluminum oxide dispersed therein.
Inventors
- 👤 Thomas J. Kondis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:08
CPC Classifications
B; B22; B22F; B22F1/00; B22F1/16; B22F9/00; B22F9/02; B22F9/04; B22F2009/043
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A method of producing improved aluminum particulate suitable for powder metallurgy applications comprising: a. milling particulate aluminum in an inert liquid and in the presence of a predetermined amount of oxygen thereby comminuting the aluminum into finer particles while oxidizing the new surfaces of such finer particles; and b. further milling said oxidized aluminum particles after the supply of oxygen is exhausted to cause the particles to weld together thereby forming an aluminum particle having aluminum oxide dispersed therein.
Claim 2
Independent Claim
79 words
A method of producing improved aluminum particulate suitable for powder metallurgy applications comprising: a. milling particulate aluminum in an inert liquid and in the presence of a predetermined amount of oxygen thereby comminuting the aluminum into finer particles while oxidizing the new surfaces of such finer particles; and b. further milling said oxidized aluminum particles after the supply of oxygen is exhausted to cause the particles to weld together thereby forming an aluminum particle having aluminum oxide dispersed therein.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein said inert liquid is selected from the class consisting of inert aromatic liquids and inert aliphatic liquids.
Claim 4
Independent Claim
106 words
A method of producing improved aluminum particulate having aluminum oxide uniformly distributed therein which comprises: a. milling particulate aluminum in an inert liquid in the presence of a milling aid capable of sorbing onto the surface of the aluminum sufficiently to prevent welding of the particles, said milling aid being selected from the class consisting of oxygen-containing compounds, olefins, hydrocarbon free radicals, hydrazine free radicals and chlorinated hydrocarbons; b. oxidizing said pyrophoric aluminum surfaces; and c. further milling said oxidized aluminum particles in the absence of an oxidizing atmosphere to cause the particles to weld together thereby forming an aluminum particle having aluminum oxide dispersed therein.
Claim 5
Independent Claim
106 words
A method of producing improved aluminum particulate having aluminum oxide uniformly distributed therein which comprises: a. milling particulate aluminum in an inert liquid in the presence of a milling aid capable of sorbing onto the surface of the aluminum sufficiently to prevent welding of the particles, said milling aid being selected from the class consisting of oxygen-containing compounds, olefins, hydrocarbon free radicals, hydrazine free radicals and chlorinated hydrocarbons; b. oxidizing said pyrophoric aluminum surfaces; and c. further milling said oxidized aluminum particles in the absence of an oxidizing atmosphere to cause the particles to weld together thereby forming an aluminum particle having aluminum oxide dispersed therein.
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) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |