An Investigation of Yttrium Oxide as a Crucible Material for Melting Titanium
Research and development rept.
DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER ANNAPOLIS MD
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The feasibility of using yttrium oxide as a crucible material for induction melting of titanium was investigated. Melting experiments using 10- and 30-gram capacity yttrium oxide crucibles led to the conclusion that molten titanium partially dissociates the yttrium oxide resulting in limited interstitial oxygen contamination of the titanium and in the formation of a titanium-yttrium-oxygen eutectic phase in the cast microstructure. Variation in the crucible density over the range of 70 to 97 of theoretical had no measurable effect on the extent of melt contamination. However, it was noted that melts prepared in oxygen deficient crucibles generally had the highest levels of contamination. Although up to 1.93 yttrium and 0.56 oxygen were picked up from the crucibles, comparison of the results reported in this investigation to those of previous studies on refractory oxides, indicates that yttrium oxide appears to be the best candidate crucible material for melting titanium.
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