Evaluation of Yttria Applicability as a Crucible for Induction Melting of TiAl Alloy

In seeking cost reductions for precision cast parts made of TiAl alloy application of induction melting using a ceramic crucible would be highly effective According!) consideration was given to the applicability of yttria as the material basis for such a ceramic crucible Crucible specifications were first investigated and a prototype crucible was fabricated with a suitable mixture ratio of raw materials from the standpoint of satisfactory thermal shock resistance and low reactivity with TiAl molten metal As a result of induction melting testing of Ti 46 at%Al alloy the developed crucible was found to facilitate substantially less contamination of the TiAl alloy with lower oxygen concentration and hardness as compared with other conventional ceramic crucibles [doi 10 2320/matertrans MAW201002]