US4174214A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resistant magnesium composite
Assignee: Rheocast Corp
•
Filing: 1978-05-19
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Granted: 1979-11-13
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Expires: 1998-05-19
Abstract
Abstract A solid composite with a magnesium or magnesium alloy matrix with degenerate dendrites therein and up to about 30 weight percent solid, substantially insoluble oxide particles dispersed in the matrix, the oxide being selected from at least one member of the group consisting of aluminum oxide and magnesium oxide.
Inventors
- 👤 Foster C. Bennett
- 👤 Sidney L. Couling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0036
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
A solid composite with a magnesium or magnesium alloy matrix with degenerate dendrites therein and up to about 30 weight percent solid, substantially insoluble oxide particles dispersed in the matrix, the oxide being selected from at least one member of the group consisting of aluminum oxide and magnesium oxide.
Claim 2
Dependent Claim
49 words
A solid composite with a magnesium or magnesium alloy matrix with degenerate dendrites therein and up to about 30 weight percent solid, substantially insoluble oxide particles dispersed in the matrix, the oxide being selected from at least one member of the group consisting of aluminum oxide and magnesium oxide.
Claim 3
Dependent Claim
11 words
The composite of claim 1 wherein the particles are aluminum oxide.
Claim 4
Dependent Claim
16 words
The composite of claim 2 wherein the particle size is up to about 1/2 inch diameter.
Claim 5
Dependent Claim
18 words
The composite of claim 2 wherein the particle size is from about 0.1 to about 200 microns diameter.
Claim 6
Dependent Claim
19 words
The composite of claim 2 wherein the composite contains from about 1 to about 30 weight percent aluminum oxide.
Claim 7
Dependent Claim
19 words
The composite of claim 2 wherein the composite contains from about 1 to about 10 weight percent aluminum oxide.
Claim 8
Dependent Claim
18 words
The composite of claim 6 wherein the particle size is from about 0.1 to about 200 microns diameter.
Claim 9
Dependent Claim
18 words
The composite of claim 7 wherein the aluminum oxide powder is substantially uniformly dispersed throughout the magnesium alloy.
Claim 10
Independent Claim
95 words
A method to form wear resistant magnesium or magnesium alloy comprising sequentially: cooling a molten magnesium or magnesium alloy metal to within a temperature range between the liquidus and solidus temperatures of the metal; agitating the cooled molten metal sufficiently to form degenerate dendrites; mixing up to about 30 weight percent solid, substantially insoluble oxide particles into the molten metal to provide a substantially uniform dispersion of the particles in the metal, the oxide being selected from at least one member of the group consisting of aluminum oxide and magnesium oxide; and solidifying the mixture.
Claim 11
Independent Claim
95 words
A method to form wear resistant magnesium or magnesium alloy comprising sequentially: cooling a molten magnesium or magnesium alloy metal to within a temperature range between the liquidus and solidus temperatures of the metal; agitating the cooled molten metal sufficiently to form degenerate dendrites; mixing up to about 30 weight percent solid, substantially insoluble oxide particles into the molten metal to provide a substantially uniform dispersion of the particles in the metal, the oxide being selected from at least one member of the group consisting of aluminum oxide and magnesium oxide; and solidifying the mixture.
Claim 12
Dependent Claim
44 words
The method of claim 9 including mixing from about 1 to about 10 weight percent aluminum oxide powder of a size within the range of from about 0.1 to about 200 microns diameter into the metal to provide, when solid, a wear resistant composite.
Claim 13
Dependent Claim
18 words
The method of claim 10 wherein the powder size is from about 5 to about 50 microns diameter.
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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) | 1982-11-12 | 1983-05-14 | 1983-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-12 | 1987-05-14 | 1987-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-12 | 1991-05-14 | 1991-11-13 | $7700.00 | Window Closed / Lapsed |