Process for forming a barrier layer on ceramic molds suitable fo

Details Process for forming a barrier layer on ceramic molds suitable fo Process for forming a barrier layer on ceramic molds suitable fo

1975-06-11

1976-08-03

Hinson, Harrison L.

Metal founding

Process

Shaping liquid metal against a forming surface

164 16, 164138, B22C 300, B22C 912, B22C 100

Patent

active

039723674

ABSTRACT:
A method of forming a metal oxide barrier layer at the interface between a refractory oxide-silica investment mold and a contained metal superalloy includes the firing of the mold or the mold-metal system, in a controlled prevailing atmosphere having a predetermined amount of oxygen therein. The barrier layer enables directional solidification of the contained superalloy at elevated temperatures to occur without metal-mold reaction.

REFERENCES:
patent: 3743003 (1973-07-01), Brown
patent: 3779816 (1973-12-01), Mao
patent: 3802482 (1974-04-01), Phipps, Jr.
patent: 3824113 (1974-07-01), Mentor et al.

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