Water soluble cores, process for producing them and process for

Details Water soluble cores, process for producing them and process for Water soluble cores, process for producing them and process for

1990-10-29

1992-07-07

Seidel, Richard K.

Metal founding

Process

Shaping a forming surface

164522, 164113, B22C 118

Patent

active

051274612

ABSTRACT:
Disclosed are water soluble core wherein a particulate refractory material is combined with a binding agent comprising Na.sub.2 CO.sub.3, Na.sub.2 O . NSiO.sub.2 where n is 0.5 to 4, and SiO.sub.2 as ingredients and a process for producing the water soluble core. The process comprises mixing the particulate refractory material with a water glass, casting the mixture of the particulate refractory material and the water glass, hardening the casting by CO.sub.2 gas, and calcining the casting at between 100.degree. C. and a temperature less than that of an endothermic peak of the water glass in differential thermal analysis. Also, a process for die casting a metal is disclosed using the water soluble core which process comprises pre-heating the water soluble core from a temperature of 300.degree. C. below a melting point of the metal to a temperature of the endothermic peak.

REFERENCES:
patent: 3548914 (1970-12-01), Hill et al.
patent: 4541869 (1985-09-01), Maak et al.

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