Phase formation in molybdenum disilicide powders during in-flight induction plasma treatment

The in-flight modification of MoSi{sub 2} powders has been carried out by using an Ar{endash}H{sub 2} induction plasma. Reactor pressure, powder feed rate, and plate power level were taken as the experimental parameters to alter the thermal history of the injected powder particles. Metastable hexagonal structure of {beta}{endash}MoSi{sub 2} is the major phase observed in the Ar{endash}H{sub 2} induction of plasma-treated molybdenum disilicide powders, while the stable phase of tetragonal structure of {alpha}{endash}MoSi{sub 2} usually retains no less than 30 wt.{percent}. Depending on the experimental condition and the deviation from stoichiometry in raw materials, low silicides, Mo{sub 5}Si{sub 3} and Mo{sub 3}Si, and free Si were observed. {copyright} {ital 1997 Materials Research Society.}

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