Method for production of investment shell mold for grain-oriente

Details Method for production of investment shell mold for grain-oriente Method for production of investment shell mold for grain-oriente

1985-08-02

1987-05-12

Lin, Kuang Y.

Metal founding

Process

Shaping a forming surface

1641221, 164361, 164519, 164528, 106 389, 106 3827, B22C 102

Patent

active

046641726

ABSTRACT:
An investment shell mold of a texture having a stucco material dispersed in mullite useful for grain-oriented casting of a Ni-base super alloy is produced by preparing a slurry having alumina powder or a mixture of alumina powder with at least one ceramic powder selected from among zircon powder, mullite powder, and spinel powder blended with a silicate binder such as silica sol, applying the slurry to the surface of an expendable pattern made typically of wax for the production of the mold, then applying thereon a stucco material, thereafter repetitively applying substantially equal slurry and stucco material alternately thereon until the applied layers assume a prescribed thickness, allowing the applied layers to solidify, then heating the hardened layers to a temperature exceeding 1,400.degree. C. thereby enabling SiO.sub.2 produced from the binder and the alumina powder in the slurry to react with each other and produce mullite.

REFERENCES:
patent: 4026344 (1977-05-01), Greskovich

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