Alumina core for casting DS materials

Details Alumina core for casting DS materials Alumina core for casting DS materials

1977-10-06

1978-08-22

Husar, Francis S.

Compositions: coating or plastic

Coating or plastic compositions

Molds and mold coating compositions

106 388, 164 28, 164 41, 164132, 249175, 264 44, 264221, B28B 730, B28B 734

Patent

active

041086724

ABSTRACT:
An alumina core for investment casting directionally solidified eutectic and superalloy materials consists of a central portion which has porosity which is continuous throughout. The material of the central portion has a micro-structure which is characteristic of alumina grains which have undergone vapor phase transport action. An outer layer of alumina encompasses the central portion and in integral therewith and contains porosity which is discontinuous.

REFERENCES:
patent: 3248241 (1966-04-01), Rifai
patent: 3972367 (1976-08-01), Gigliotti, Jr. et al.
patent: 4026344 (1977-05-01), Greskovich
patent: 4031945 (1977-06-01), Gigliotti, Jr. et al.

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