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US3828839A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for preparing fiber reinforced metal composite structures

Assignee: EIDP Inc
•
Filing: 1973-04-11
•
Granted: 1974-08-13
•
Expires: 1993-04-11
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Abstract

Abstract An economical process is disclosed for the preparation of strong composites of magnesium-containing metals reinforced with alumina-containing refractory oxide fibers. In the process alumina-containing fibers in a solid matrix of a soft, flexible organic polymer are loaded into a mold and the organic polymer is burned off. The remaining fibers are then aligned and uniformly distributed within the mold and the mold heated to about the temperature of the magnesium-containing metal to be used. Finally, the magnesium-containing metal is forced into the mold in a molten state by applying pressure. In this manner strong alumina fiber/magnesium-containing metal composites are formed which are useful as turbine blades, and structural beams and shafts, and the like.

Inventors

  • 👤 A Dhingra

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 17:12
CPC Classifications
B; B22; B22D; B22D19/00; B22D19/02; B22D19/14

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 29 words
The process of claim 1 wherein, in step E the molten metal is forced into the mold through a heat-resistant plate containing a plurality of small uniformly spaced apertures.
Claim 2
Dependent Claim 36 words
The process of claim 1 wherein the solid organic polymer is substantially amorphous and has a glass transition temperature of about 200*C. or less, and a modulus of elasticity of less than 0.1 X 106 psi.
Claim 3
Dependent Claim 24 words
The process of claim 1 wherein in step E the molten metal is forced into the mold by evacuating the interior of the mold.
Claim 4
Dependent Claim 29 words
The process of claim 1 wherein the volume percent of fibers in the mold in step A is at least about 50 percent is less than about 80 percent.
Claim 5
Dependent Claim 31 words
The process of claim 1 wherein the Al2O3 in the fibers employed is predominately alpha alumina and the diameter of the fibers employed is between about 15 and about 25 microns.
Claim 6
Dependent Claim 35 words
The process of claim 6 wherein the Fibers have a microscopic roughness height of between about 1100 A and about 7000 A and a microscopic roughness period of between about 4000 A and 15000 A.
Claim 7
Dependent Claim 22 words
The process of claim 6 wherein the fibers employed contain a coating of vitrified silica about 0.01 to about 1 micron thick.
Claim 8
Dependent Claim 36 words
The process of claim 6 wherein the solid organic polymer is substantially amorphous and has a glass transition temperature of about 20*C. or less, and a modulus of elasticity of less than 0.1 X 106 psi.
Claim 9
Dependent Claim 13 words
The process of claim 9 wherein the organic polymer employed is polyethyl acrylate.
Claim 10
Dependent Claim 20 words
The process of claim 9 wherein the Al2O3 content of the fibers employed is at least 95 percent by weight.
Claim 11
Dependent Claim 24 words
The process of claim 9 wherein in step E the molten metal is forced into the mold by evacuating the interior of the mold.
Claim 12
Dependent Claim 30 words
The process of claim 6 wherein the volume percent of fibers in the mold in step A is at least about 50 percent and is less than about 80 percent.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-08-12 1978-02-11 1978-08-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-12 1982-02-11 1982-08-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-12 1986-02-11 1986-08-13 $7700.00 Window Closed / Lapsed

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