Preparation of high temperature shell molds

Details Preparation of high temperature shell molds Preparation of high temperature shell molds

B - Operations, Transporting

28

B

22/164, 6/42

B28B 7/00 (2006.01) B22C 1/16 (2006.01) B22C 1/20 (2006.01) C08K 5/17 (2006.01)

Patent

CA 1051608

ABSTRACT OF THE DISCLOSURE A binder composition and process for preparing shell molds are provided. The process comprises the first step of coating a pattern with a novel binder composition containing a silicate ester, preferably a prehydrolyzed alkyl orthosilicate ester in which the alkyl group has from 1 to 4 carbon atoms, an aminoalcohol, preferably one of the formula HORN(R')2 in which R is a divalent hydrocarbon radical having from 1 to .epsilon. carbon atoms, and R' is hydrogen, an alkyl radical or a radical of the formula -ROH, sufficient organic solvent to form a binder composition having an SiO2 content of from 10-35 percent by weight, and a refractory material; the second step of stuccoing and thereafter drying the coated pattern. The coating, stuccoing and drying sequence is repeated until the desired coating thickness is achieved and then a sealing coat is applied, if desired.

231708

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