Lightweight and low thermal expansion composite material

Details Lightweight and low thermal expansion composite material Lightweight and low thermal expansion composite material

1990-12-03

1993-11-09

Thibodeau, Paul J.

Metal founding

Process

Shaping liquid metal against a forming surface

428325, 428329, 428332, 428406, 428433, B22D 704, B32B 516

Patent

active

052594351

ABSTRACT:
A method of forming a metallic composite product having a specific gravity no greater than 1.8 and a thermal expansion no greater than 16.times.10.sup.-6 .degree. C. in a preheated mold. The portion of the mold between a cavity and the gate has a stainless steel wire gauge for retaining particles. The mold is filled with screened fly ash, glass, hollow spheres having a particle size in the range of 50 to 200 micrometers and a globularness of at least 90%, which has been preheated to the same temperature as the mold. Molten aluminum alloy is injected into the mold at a pressure in the range of from 40 to 80 kgf cm.sup.2 at the gate and at a flow velocity in the range of 0.08 to 0.20 m/second.

REFERENCES:
patent: 4340109 (1982-07-01), Roddy
patent: 4568603 (1986-02-01), Oldham
patent: 4621024 (1986-11-01), Wright
patent: 4739817 (1988-04-01), Hamajima et al.
patent: 4907780 (1990-02-01), Sasaki et al.
patent: 4939038 (1990-07-01), Inabata et al.
patent: 5007474 (1991-04-01), Langensiepen et al.

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