HOT-PRESSING OF ELECTROLYTIC, DEHYDRIDED, AND CALCIUM-REDUCED THORIUM POWDERS
Hot-pressing variables of time, temperature and pressure were determined for electrolytic, dehydrided and calcium-reduced thorium powders. All powders were found to yield high densities of about 11.50 g/cc when these variables were within the following ranges: a) temperature -625 to 650 deg C; bl time at pressure-10 to l5 minutes; and c) pressure-l2 to l5 tsi. A preforming procedure prior to hot-pressing was found to be effective for thorium powders which had low apparent densities. The results include data on hardness for an evaluation of the densification characteristics of each type of powder. Microstructure of typical hot-pressed samples for each type of powder showed that electrolytic powders contain large grain configurations. Rehydrided and calciuun-reduced thorium microstructures showed a thorium matrix with a relatively uniform distribution of impurities, believed to be mainly oxides. (auth)
- Research Organization:
- Sylvania Electric Products Inc. Atomic Energy Div., Bayside, N.Y.
- NSA Number:
- NSA-12-002346
- OSTI ID:
- 4326982
- Report Number(s):
- SEP-224
- Country of Publication:
- United States
- Language:
- English
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