Method and apparatus for treating eutectic and eutectoid composi

Details Method and apparatus for treating eutectic and eutectoid composi Method and apparatus for treating eutectic and eutectoid composi

1980-11-14

1983-02-08

Andrews, M. J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10R, C22C 102

Patent

active

043727816

ABSTRACT:
A process and apparatus for preparing anisotropic metallic and ceramic compositions or material includes floating zone melting of eutectics and orientation of eutectoids, as well as melting, frittering, or homogenization of the eutectoids prior to orientation. The process includes solidification of a eutectic in the presence of a thermal gradient while displacing the solidification front of the eutectic along the direction of the gradient and orienting the solid eutectoid which results by imposing a direction of growth on it by displacement of the composition itself or the temperature gradient. The eutectoids are then prepared in a reactive atmosphere within a container and the surface thereof treated in gaseous atmosphere, after which the materials are compacted by displacing them again. The apparatus for performing the process includes a double heating and cooling system and structure for translating and rotating these systems. It additionally includes a support plate for supporting the elements being oriented, the plate being attached to a displacement shaft. Electronic controls for all of the structures are connected to temperature and displacement sensors.

REFERENCES:
patent: 3124452 (1964-03-01), Kraft
patent: 3564940 (1971-02-01), Thompson et al.

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