| 摘要 |
PURPOSE:To manufacture a Ti-Al alloy excellent in quality, by placing metallic titanium in a crucible composed of graphite or calcareous refractory, by heating the above to a specific temp. in an inert-gas atmosphere, and by adding pure Al. CONSTITUTION:Ti 25 is put in a graphite or calcia crucible 2 free from erosion by molten Ti, etc., and unreactive to Ti, and the inside of a vacuum vessel 1 in which the above crucible 2 is placed is formed into high vacuum or subjected to introduction of an Ar gas from an inlet 11, and then heated by means of an induction coil 3 provided to the outside periphery of the crucible. At the point of time when a temp. in a range of 1,300-1,670 deg.C (the melting point of Ti) is reached, Al in a vessel 6 evacuated from an outlet 7 is added into the crucible 2 by means of a conveying trough 9. In this way, the evaporation losses, due to superheating, of Al heaving low melting point are removed and the absorption of oxygen in calcia of the crucible 2 by Ti-Al alloy is prevented, so that Ti-Al alloy excellent in purity and composition ratio can be manufactured.
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