Abstract
The effect of ultra-high vacuum melting on the purification of Ti-Al alloys, especially on reducing gaseous impurities, is investigated using new floating-zone melting furnace and cold-crucible melting furnace in which ultra-high vacuum of 10 -7 Pa is attainable. Ultra-high vacuum melting is effective in the purification of Ti-Al alloy, especially in reducing oxygen content. The high purity homogeneous Ti-Al alloy ingot containing 85 mass ppm oxygen is obtained from Ti of 99.99 mass% purity and Al of 99.9998 mass% purity by cold-crucible melting twice in argon and lastly in ultra-high vacuum. The Ti-Al alloy bar prepared from Ti of 99.9999 mass% purity and Al of 99.9998 mass% purity by arc melting is further zone-melted under ultra-high vacuum and 36 mass ppm oxygen in the bar is reduced to 13 mass ppm. The new floating-zone melting furnace and cold-crucible melting furnace which can attain to ultra-high vacuum of 10 -7 Pa are useful for the preparation of high-purity Ti-Al alloy containing low concentration of gaseous impurities.
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