Alumina-based core containing yttria

Details Alumina-based core containing yttria Alumina-based core containing yttria

1987-06-04

1989-06-06

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 80, 501 81, 501119, 501120, 501121, 106 389, C04B 3510

Patent

active

048371874

ABSTRACT:
A ceramic core for use in the investment casting of metals includes, prior to sintering, about 80 w/o to about 86 w/o of a ceramic filler material and about 14 w/o to about 20 w/o of a binder material. The ceramic filler material includes about 66 w/o to about 95 w/o Al.sub.2 O.sub.3 particles, about 1 w/o to about 20 w/o Y.sub.2 O.sub.3 particles, about 1 w/o to about 5 w/o of a grain growth inhibiting agent, and the balance a carbon-bearing fugitive filler material. Subsequent to sintering, the ceramic core has a microstructure characterized by the presence of substantially unreacted Al.sub.2 O.sub.3 particles having a polycrystalline composition consisting essentially of 3Y.sub.2 O.sub.3.5Al.sub.2 O.sub.3 on the surfaces of the Al.sub.2 O.sub.3 particles.

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