Magnesia doped alumina core material

Details Magnesia doped alumina core material Magnesia doped alumina core material

1977-03-09

1978-07-25

McCarthy, Helen M.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 62, 106 734, 164 41, 164132, B22C 910, B22D 2100, B28B 734, C04B 3544

Patent

active

041026896

ABSTRACT:
Alumina doped with from 1 mole percent up to about 20 mole percent magnesia is suitable for use as a core material for casting and directional solidification of advanced super-alloys. The core material is leachable in KOH and NaOH in an autoclave at an elevated temperature and elevated pressure.

REFERENCES:
patent: 3643728 (1972-02-01), Hulse
patent: 3725094 (1973-04-01), Levy et al.
patent: 4031177 (1977-06-01), Auriol et al.
patent: 4043377 (1977-08-01), Mazdiyasni
Bailey, J. T. et al. "Preparation and Properties of Dense Spinel Ceramics in the Mg Aw.sub.2 O.sub.4 -Aw.sub.2 O.sub.3 System"-Trans. Brit. Cer. Soc. 68(4), pp. 159-164, (1969).
Fritsche, E. T. et al. "Liquidus in the Alumina-Rich System La.sub.2 O.sub.3 -Aw.sub.2 O.sub.3 ", J. Am. Cer. Soc. 50(3) pp. 167-168 (1967).

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