B - Operations – Transporting – 22 – C
Patent
B - Operations, Transporting
22
C
6/41
B22C 1/04 (2006.01) B22C 1/00 (2006.01) B22C 9/10 (2006.01) C04B 35/10 (2006.01) C04B 35/111 (2006.01)
Patent
CA 1311090
Abstract of the Disclosure 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 Al2O3 particles, about 1 w/o to about 20 w/o Y2O3 particles, about 1 w/o to about 5 w/o of a grain growth in- hibiting 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 Al2O3 particles having a polycrystalline composition consisting essentially of 3Y2O3-5Al2O3 on the surfaces of the Al2O3 particles.
567855
Canfield Kenneth A.
Frank Gregory R.
Wright Thomas R.
Canfield Kenneth A.
Frank Gregory R.
Howmet Corporation
Kirby Eades Gale Baker
Wright Thomas R.
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