Microwave drying of ceramic shell molds

Details Microwave drying of ceramic shell molds Microwave drying of ceramic shell molds

1978-10-06

1980-01-01

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 4, 34 15, 34 92, F26B 700, F26B 228

Patent

active

041809181

ABSTRACT:
A method of drying a refractory slurry layer deposited on a mold pattern (10) formed of a thermally fusible material having low heatability by subjection to microwave energy (E), to form a shell mold. The mold pattern (10) is coated with a slurry layer and is subjected to microwave energy (E) sufficient to heat the refractory slurry. A portion of the liquid phase of the heated slurry is withdrawn while concurrently cooling the slurry and mold pattern to maintain the mold pattern at a temperature subjacent the fusion temperature of the mold pattern material. The mold pattern (10) may be recoated, resubjected concurrently to microwave energy (E) and withdrawal of the liquid phase of the slurry until the slurry is effectively dried in the mold pattern while effectively preventing undesirable thermal distortion of the mold pattern.

REFERENCES:
patent: 3191250 (1965-06-01), Mellen, Jr. et al.
patent: 3704523 (1972-12-01), Guerga et al.
patent: 3732048 (1973-05-01), Guerga et al.
patent: 3850224 (1974-11-01), Vidmar et al.
patent: 4043380 (1977-08-01), Valentine

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