Silicon nitride (SI.sub.3 N.sub.4) leachable ceramic cores

Details Silicon nitride (SI.sub.3 N.sub.4) leachable ceramic cores Silicon nitride (SI.sub.3 N.sub.4) leachable ceramic cores

1976-07-19

1978-12-19

Husar, Francis S.

Metal founding

Process

Shaping liquid metal against a forming surface

164 41, 164138, 106 382, 106 389, B22D 2900, B22C 100

Patent

active

041301579

ABSTRACT:
A method of producing cast articles having internal cavities is disclosed. The method is particularly suitable for casting gas turbine components from nickel base and cobalt base superalloys. The method comprises: forming a core to the desired cavity configuration, the core consisting essentially of densified silicon nitride; securing the core within a mold; casting the alloy within the mold and around the core; removing the solidified cast article from the mold; and leaching the silicon nitride core from the casting in molten sodium hydroxide.

REFERENCES:
patent: 3011233 (1961-12-01), Kirtchik
patent: 3643728 (1972-02-01), Hulse
patent: 3698467 (1972-10-01), Fassler et al.
patent: 3709459 (1973-01-01), Bushrod
patent: 3727670 (1973-04-01), Bailey
The Condensed Chemical Dictionary, Reinhold Pub. Corp., New York, 1963, pp. 1019-1020.

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