US4818633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibre-reinforced metal matrix composites
Assignee: Saffil Ltd
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Filing: 1986-11-10
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Granted: 1989-04-04
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Expires: 2006-11-10
Abstract
Abstract A metal matrix composite comprises randomly-oriented inorganic oxide fibres of density below 3 g/ml embedded in a metal matrix material such as a light metal, for example aluminium or magnesium or an alloy thereof. In a particular embodiment the fibres are of density 1.8 to 2.5 g/ml and preferably are of mean diameter from 2 to 10 microns. The composite can be made by liquid infiltration of a fibre preform comprising the fibres bound together with an inorganic or an organic binder or by extrusion of a mixture of the fibres and a powdered metal matrix material.
Inventors
- 👤 John Dinwoodie
- 👤 Martyn H. Stacey
- 👤 Michael D. Taylor
- 👤 Andrew M. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:16
CPC Classifications
C; C22; C22C; C22C49/00; C22C49/02; C22C49/04; C22C49/06; C22C47/00; C22C47/08; C22C49/14; B; B22; B22F; B22F2998/00; B22F2998/10; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
35 words
A metal matrix composite comprising randomly oriented alumina fibres wherein the density of the individual fibres is from 1.8 to 2.5 g/ml embedded in a metal matrix material of density from 1.8 to 2.8 g/ml.
Claim 2
Dependent Claim
35 words
A metal matrix composite comprising randomly oriented alumina fibres wherein the density of the individual fibres is from 1.8 to 2.5 g/ml embedded in a metal matrix material of density from 1.8 to 2.8 g/ml.
Claim 3
Dependent Claim
22 words
A metal matrix composite as claimed in claim 1 wherein the mean diameter of the fibres is from 2 to 10 microns.
Claim 4
Dependent Claim
24 words
A metal matrix composite as claimed in claim 1 or claim 2 wherein the loading of fibres is from 10% to 60% by volume.
Claim 5
Dependent Claim
12 words
A composite as claimed in claim 1 wherein the fibres contain silica.
Claim 6
Dependent Claim
18 words
A composite as claimed in claim 1 wherein the matrix metal is aluminium or an alloy of aluminium.
Claim 7
Dependent Claim
36 words
A composite as claimed in claim 1 comprising an alumina fibre preform infiltrated with a metal matrix material wherein the density of the metal matrix composite is less than the density of the metal matrix material.
Claim 8
Dependent Claim
18 words
A composite as claimed in claim 1 wherein the matrix metal is magnesium or an alloy of magnesium.
Claim 9
Dependent Claim
25 words
A composite as claimed in claim 1 wherein the fibres have a tensile strength greater than 1500 MPa and a modulus greater than 150 GPa.
Claim 10
Dependent Claim
28 words
A composite as claimed in claim 7 comprising a matrix metal of density less than 2.0 g/l having embedded therein fibres of apparent density 2 g/ml or less.
Claim 11
Dependent Claim
37 words
A composite as claimed in claim 1 comprising an extruded mixture of alumina fibres and a metal matrix material wherein the density of the metal matrix composite is less than the density of the metal matrix material.
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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) | 1992-04-03 | 1992-10-03 | 1993-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-03 | 1996-10-03 | 1997-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-03 | 2000-10-03 | 2001-04-04 | $7700.00 | Window Closed / Lapsed |