Abstract
Ti3Al intermetallic compound coating was fabricated just as sprayed conditions by RF plasma spraying without any after heat treatment. Mechanically alloyed Ti-Al powders, which were highly mixed and bonded, were introduced to plasma spraying. DC plasma sprayings were also conducted under various combinations of working gases for the comparison purposes.The results obtained are summarized as follows.(1) Ti3Al intermetallic coatings could not be obtained by the DC plasma spray process. The coatings obtained by DC plasma spraying had layer structures of different compositions. Too large acceleration by the DC plasma jet should be attributed to this coating structure.(2) Ti3Al intermetallic coatings were prepared by RF plasma spraying of MA powders without any after heat treatments.(3) The feasibility of the combination process of mechanical alloying and RF plasma spraying to fabricate the intermetallic coatings was also discussed.
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