PRODUCTION OF BIMETAL-REDUCED HAFNIUM
Technical Report
·
OSTI ID:4059572
Since it was desired to produce hafnium ductile enough for rolling into strips, experiments were performed in which HfCl/sub 4/ produced from HfO/sub 2/ was reduced in different ways. The conventional (Kroll) way using magnesium gave hafnium of high oxygen content which could not be rolled. Bimetal reduction using sodium and magnesium gave better recoveries of hafnium with low oxygen content (800 ppm); HfCl/sub 4/ evaporation from fused NaCl-KCl during bimetal reduction lowered the aluminum content in hafnium produced from HfCl/sub 4/ made from HfO/sub 2/ of high aluminum content (>1200 ppm). Sponge from nine fused- salt bimetal reduction runs was melted into ingots and rolled into strips. However, the strips were frequently microporous and four had a hardness exceeding the maximum allowable hardness of Rockwell A 56 (R/sub c/2O). (D.L.C.)
- Research Organization:
- Bureau of Mines, Albany, Oreg.
- NSA Number:
- NSA-15-013243
- OSTI ID:
- 4059572
- Report Number(s):
- BM-RI-5734
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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