Method of making and using a ceramic shell mold
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United States of America Patent
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Sep 23, 1980
Grant Date -
N/A
app pub date -
Dec 4, 1978
filing date -
Dec 4, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making a shell mold (6) includes alternately applying a ceramic coating composition (8) and a stucco composition (10) to an expendable pattern, the presence of graphite being substantially avoided therein, and applying a barrier coating (16) thereto including a ceramic powder, a binder, and a preselected amount of graphite. A preferred range of graphite of about 13 to 17 Wt. % in the barrier coating (16) minimizes decarburization of a ferrous article formed in the cavity of the shell mold (6).
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