High temperature electric arc furnace and method
AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorsRichard M. Poorman, Deborah D. Schmidt
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Abstract
An apparatus and process for improving the microstructure of electrically conducting materials is disclosed by the present invention. A revolving heat source applies heat to the surface of the material evenly and quickly. One or more heat sinks quickly cool the material. In the preferred embodiment, the cooling may be done in such a way as to promote as high a degree of directional grain growth as desired or completely nondirectional grain growth.
Claims1
A process for improving the microstructure of an electrically conducting material, said material having a thickness of at least three (3) millimeters, comprising the steps of:
- a. in a zero-gravity environment, heating said material to a molten state throughout said thickness, said heating occurring during a period of approximately five (5) seconds;
- b. while maintaining a zero-gravity environment, allowing said material to cool and resolidify while using at least two heat sinks in contact with said material, said cooling and resolidification occurring during a period of approximately ten (10) seconds;
- whereby said heat sinks induce temperature gradients in said material during said cooling step sufficient to cause grain growth in the direction of said temperature gradients.
Dependencies are inferred from the claim text.