Process for preparing and using a ceramic shell as a casting mol

Details Process for preparing and using a ceramic shell as a casting mol Process for preparing and using a ceramic shell as a casting mol

1995-04-14

1997-04-08

Hail, III, Joseph J.

Metal founding

Process

Shaping a forming surface

164519, 164523, 164524, 164529, B22C 104

Patent

active

056179120

ABSTRACT:
The present invention pertains to a process for preparing ceramic shells as casting molds, wherein a) a pattern of a part to be cast, which pattern can be melted or dissolved out, is prepared, b) the pattern is dipped into a dip-coating composition of a slurry of a refractory material and a binder in order to form a wet coating on the pattern, c) a coarse refractory powder is sprinkled onto the coating, d) the coating is dried, and e) steps b), c) and d) are repeated until the mold shell has reached the desired thickness. A ceramic protective material is added to the dip-coating composition and/or to the coarse refractory powder. Carbon is introduced into the ceramic protective material during the preparation in the molten state. The carbon is able to chemically bind oxygen at the time of the cooling of the casting essentially at mold temperatures above the firing temperature of the casting mold and is thus able to prevent skin decarburization and surface defects in carbon-containing steels.

REFERENCES:
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patent: 3474851 (1969-10-01), Taylor
patent: 3656983 (1972-04-01), Sulinski
patent: 4223716 (1980-09-01), Ostrowski
(Nike-) Nippon Kenmazai Kog May 7, 1980 Database WPI Derwent Publications Ltd., London, GB: AN 80-42553c.

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