Method of making and using a ceramic shell mold

Details Method of making and using a ceramic shell mold Method of making and using a ceramic shell mold

1978-12-04

1980-09-23

Spruill, Robert Louis

Metal founding

Process

Shaping a forming surface

164 41, 164138, 164361, B22C 104

Patent

active

042237165

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).

REFERENCES:
patent: 3126597 (1964-03-01), Operhall et al.
patent: 3153826 (1964-10-01), Horton
patent: 3184813 (1965-05-01), O'Shea
patent: 3256574 (1966-06-01), Lirones
patent: 3296666 (1967-10-01), Lirones
patent: 3656983 (1972-04-01), Sulinski

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