Casting of metal articles

Metal founding – Process – Shaping a forming surface

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106 389, B22C 100

Patent

active

045482560

ABSTRACT:
A casting process is described, the process embodying the use of cores made from material comprising dicalcium silicate. Dicalcium silicate undergoes various phase changes during heating and cooling one of which, the .beta. to .gamma. transformation, is accompanied by a large volume increase. By using this feature casting cores may be produced which disintegrate during cooling of the solidified metal.

REFERENCES:
patent: 3770469 (1973-11-01), Kapolyi et al.
patent: 4020027 (1977-04-01), Nicholas et al.
Chemical Abstracts, vol. 86, Mar. 21-Apr. 4, 1977, Bibka et al, "Study of . . . Dicalcium Silicate . . . ", p. 334.
Chemical Abstracts, vol. 90, Mar. 5-19 1979, Thomas et al, "The Beta to Gamma Dicalcium Silicate Phase Transformation," p. 173.

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