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Pure yttria moulds have been prepared for directional solidifications of Nb–22Ti–16Si–6Hf–2Al–2Cr (at. %) alloy with a withdrawal rate of 1×10 –4 ms –1 at 1850°C and 1900°C. This study demonstrates that a mild interface reaction occurred between the yttria mould and hafnium, the most reactive element in the alloy. A sequential reaction layer of HfO 2 and Y 2 O 3...
In this work, pure yttria moulds have been prepared for directional solidifications of Nb-silicide based alloys with a withdrawal rate of 1×10 −4 m·s −1 at 1900°C. The influence of Hf contents on the metal–mould interfaces and contaminations was evaluated and the interaction mechanisms were described. In the alloys contained Hf, a continuous reaction layer consisting of HfO 2 ...
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