Patent US6862749B1 successfully refreshed from Google Patents.
US4579587A
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Method for producing high strength metal-ceramic composition
Assignee: Massachusetts Institute of Technology
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Filing: 1985-01-28
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Granted: 1986-04-01
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Expires: 2005-01-28
Abstract
Abstract Metal powder-oxide compositions are provided suitable for forming high strength composite products. The compositions comprise powdered flake-like metal alloys having a thickness between 0.5 and 2 microns wherein the oxide comprises between 0.5 and 5 weight percent of the composite compositions.
Inventors
- 👤 Nicholas J. Grant
- 👤 Charles H. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:25
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026; Y; Y10; Y10S; Y10S75/00; Y10S75/954
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
A process for making a metal-refractory oxide composite powder comprising the steps of: melting a metal alloy into a molten state; atomizing said molten metal into liquid particles and rapidly solidifying said liquid particles at a cooling rate of at least 100° C. per second to form a substantially homogeneous metal powder; converting said metal powder into flake-like particles ranging in thickness from about 0.5 to 2.0 microns; and mechanically incorporating refractory oxide particles into said flake-like metal particles to form a composite powder, said refractory oxide particles representing a ratio of up to about 5.0 weight percent of said composite powder.
Claim 2
Dependent Claim
102 words
A process for making a metal-refractory oxide composite powder comprising the steps of: melting a metal alloy into a molten state; atomizing said molten metal into liquid particles and rapidly solidifying said liquid particles at a cooling rate of at least 100° C. per second to form a substantially homogeneous metal powder; converting said metal powder into flake-like particles ranging in thickness from about 0.5 to 2.0 microns; and mechanically incorporating refractory oxide particles into said flake-like metal particles to form a composite powder, said refractory oxide particles representing a ratio of up to about 5.0 weight percent of said composite powder.
Claim 3
Independent Claim
116 words
A method for making an article comprising a metal-refractory oxide composite, said method comprising the steps of: melting a metal alloy into a molten state; atomizing said molten metal into liquid particles and rapidly solidifying said liquid particles at a cooling rate of at least 100° C. per second to form a homogeneous metal powder; converting said metal powder into flake-like particles ranging in thickness from about 0.5 to 2.0 microns; mechanically incorporating refractory oxide particles into said flake-like metal particles to form a composite powder, said refractory oxide particles representing a ratio of up to about 5.0 weight percent of said composite powder; and consolidating said composite powder to form an article of predetermined shape.
Claim 4
Independent Claim
116 words
A method for making an article comprising a metal-refractory oxide composite, said method comprising the steps of: melting a metal alloy into a molten state; atomizing said molten metal into liquid particles and rapidly solidifying said liquid particles at a cooling rate of at least 100° C. per second to form a homogeneous metal powder; converting said metal powder into flake-like particles ranging in thickness from about 0.5 to 2.0 microns; mechanically incorporating refractory oxide particles into said flake-like metal particles to form a composite powder, said refractory oxide particles representing a ratio of up to about 5.0 weight percent of said composite powder; and consolidating said composite powder to form an article of predetermined shape.
Claim 5
Dependent Claim
21 words
The process of claim 1 or 2 wherein said refractory oxide particles range in size from about 0.05 to 0.2 microns.
Claim 6
Dependent Claim
26 words
The process of claims 1 or 2 wherein said refractory oxide particles represent a ratio of about 0.5 to 3.0 weight percent of said composite powder.
Claim 7
Dependent Claim
14 words
The process of claim 1 or 2 wherein said metal alloy is stainless steel.
Claim 8
Dependent Claim
15 words
The process of claim 1 or 2 wherein said metal is a cobalt nickel-chromium alloy.
Claim 9
Dependent Claim
15 words
The method of claim 1 or 2 wherein said refractory oxide powder is yttrium oxide.
Claim 10
Dependent Claim
15 words
The method of claim 1 or 2 wherein said refractory oxide powder is beryllium oxide.
Claim 11
Dependent Claim
15 words
The method of claim 1 or 2 wherein said refractory oxide powder is thorium oxide.
Claim 12
Dependent Claim
31 words
The process of claim 1 or 2 wherein said metal powder is converted to flake-like particles by attrition and said flake-like particles are incorporated with refractory oxide particles by ball milling.
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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) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |