Die cast heat treated aluminum silicon based alloys and method f

Details Die cast heat treated aluminum silicon based alloys and method f Die cast heat treated aluminum silicon based alloys and method f

1989-05-24

1990-06-19

Lin, Kuang Y.

Metal founding

Process

Shaping liquid metal against a forming surface

164120, 148 3, B22D 1802, B22D 2711

Patent

active

049344420

ABSTRACT:
A die cast, heat treated shaped aluminum silicon alloy article consisting essentially of, based on an alloy weight, from 13 to 25 wt % silicon, from 2 to 6 wt % copper, up to 1 wt % magnesium, balance aluminum, said heat treated alloy being formed by the process comprising: subjecting said alloy while in molten condition to a primary pressure die casting at a casting pressure of from about 450 to about 500 kg/cm.sup.2 to form a primary pressure die cast product; removing the primary casting pressure from said primary pressure die cast product; prior to the time said aluminum silicon alloy completely solidifies, subjecting said primary pressure die cast alloy to a secondary pressure die casting so as to reduce the volume thereof from about 1.5% to about 3%; heating the thus treated product to a temperature of from about 460.degree. C. to about 520.degree. C. for a period of time of from about 2 to about 10 hours; and rapidly quenching said product to produce said article. The process used to produce the article as also claimed as is the combination of the article in sliding contact with another material having a hardness HV of at least 50.

REFERENCES:
patent: 4336076 (1982-06-01), Edamura et al.
patent: 4380261 (1983-04-01), Suzaki et al.
patent: 4419143 (1983-12-01), Ito et al.

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