US4565744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wettable coating for reinforcement particles of metal matrix composite
Assignee: Boeing North American Inc
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Filing: 1983-11-30
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Granted: 1986-01-21
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Expires: 2003-11-30
Abstract
Abstract Metal matrix composite materials are formed from a reinforcing, submicron-particle material, such as SiC, which is not easily wettable by a matrix metal, such as Al, and therefore cannot be uniformly dispersed in the matrix because the particles agglomerate. A coating 12 of material, such as Si, easily wettable by the matrix metal, is placed on the surface of the particles 10 before mixing the reinforcing particles in the matrix metal.
Inventors
- 👤 Robert J. Walter
- 👤 Jerhong Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:14
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/10; C22C1/1036; C22C32/00; C22C32/0047; C22C32/0052; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12181; Y10T428/12486
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
48 words
Improved submicron reinforcing particles for use in forming a metal matrix composite in which the material of the particles is not easily wettable by the metal; said improved particles comprising: reinforcing submicron particles coated on their surfaces with a material which is easily wettable by the matrix metal.
Claim 2
Dependent Claim
48 words
Improved submicron reinforcing particles for use in forming a metal matrix composite in which the material of the particles is not easily wettable by the metal; said improved particles comprising: reinforcing submicron particles coated on their surfaces with a material which is easily wettable by the matrix metal.
Claim 3
Dependent Claim
16 words
Improved particles as in claim 1, wherein: said particles are less than 10 microns in diameter.
Claim 4
Dependent Claim
31 words
Improved particles as in claim 1, wherein: the coating thickness is sufficient to maintain wettability of said particles during subsequent processing stages during which said metal is in the liquid phase.
Claim 5
Dependent Claim
16 words
Improved particles as in claim 1, wherein: the coating thickness is about 100 atomic layers thick.
Claim 6
Dependent Claim
25 words
Improved particles as in claim 1, wherein: the matrix metal is Al, the particles are formed from SiC and the coating is formed from Si.
Claim 7
Dependent Claim
51 words
Improved SiC submicron reinforcing particles for use in forming an Al metal matrix in which the SiC is not easily wettable by the Al metal, said improved particles comprising: reinforcing submicron particles of SiC coated on their surfaces with a layer of Si, which is easily wettable by the Al metal.
Claim 8
Dependent Claim
51 words
Improved SiC submicron reinforcing particles for use in forming an Al metal matrix in which the SiC is not easily wettable by the Al metal, said improved particles comprising: reinforcing submicron particles of SiC coated on their surfaces with a layer of Si, which is easily wettable by the Al metal.
Claim 9
Dependent Claim
15 words
Improved particles as in claim 6, wherein: the coating is approximately 100 atomic layers thick.
Claim 10
Dependent Claim
16 words
Improved particles as in claim 6, wherein: the particles are less than 10 microns in diameter.
References Cited (Backward Citations)
US4082864A
Cited
US4134759A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |