Method of casting bismuth, silicon and silicon alloys

Details Method of casting bismuth, silicon and silicon alloys Method of casting bismuth, silicon and silicon alloys

1975-07-08

1977-08-30

Baldwin, Robert D.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

75134S, 164124, 164126, B22D 2100

Patent

active

040455360

ABSTRACT:
Disclosed is a method of preparing castings of bismuth, silicon and silicon alloys characterized by solidification expansion by cooling the molten material below its melting point to form a casting of the material within a suitable container. According to the disclosed method, a tapered liquid core with the smaller end downward and the larger end upward and a portion of the top of the casting, i.e., a liquid pool on top of the casting, are maintained in a molten state and in liquid communication with each other until the casting is substantially solidified, for example, by keeping the liquid pool on top molten by insulation or by heat addition or by both insulation and heat addition. Thereafter, the core and the top are allowed to solidify, providing a casting substantially free of defects.

REFERENCES:
patent: 1251951 (1918-01-01), Ashdown
patent: 1978996 (1934-10-01), Gathmann
patent: 2734242 (1956-02-01), Marburg
patent: 2821760 (1958-02-01), Kurzinski
patent: 3189440 (1965-06-01), Plust
patent: 3660081 (1972-05-01), Farrell et al.
patent: 3704745 (1972-12-01), Saunders

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