Induction Plasma Spheroidization of Tungsten and Molybdenum Powders,2013-III
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- Category: Molybdenum knowledge
- Published on 17 June 2013
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To study the melting behavior of the refractory metals of tungsten and molybdenum powders,plasma spheroidization of powders is a good way .Induction plasma spray has been used in the processing of alumina,tungsten, and molybdenum.Emphasis of this study is to compare the melting,evaporation and oxidation behaviors of tungsten and molybdenum,as well as thesolidification phenomena of these two powders during processing by induction plasma.
Induction plasma spheroidization of tungsten and molybdenum powders demonstrates that less molybdenum particles than tungsten particles aremelted and spheroidized at the same powder feed ratealthough molybdenum has a lower melting point. When a molten tungsten particle has a temperature much higher than its melting point,some large grains form in the tungsten particle.
When a molten particle has a temperature close to its melting point,a large number of small grains form in the tungsten particle. Induction plasma processing of tungsten leads to the evaporation of a limited fraction of tungsten powder.The evaporized tungsten condenses either on the wall of plasma spray chamber or on the surface of tungsten particles nearby.Oxidation of tungsten vapor occursunder soft vacuum plasma processing condition.
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