水冷却制御方式の撹拌型反応ボールミルによるアモルファスTiAl粉末の製造

概要

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In order to realize a high quality and effecient mass production of amorphous TiAI powder, we developed a rotating-arm reaction ball mill having a control system of water cooling, with which one can control a rate of solid state amorphization by the mechanical alloying(MA) of powder mixture, TiAI on the basis of kinetics. It is found that MA of TiAI shows one-stage amorphization with Johnson-Mehl-Avrami exponent of 2.5 at a higher plateau attrition temperature above 69°C, and two-stage amorphization with n<SUB>1</SUB>=1.5 and n<SUB>2</SUB>=3, 2.5 at a lower temperature region. When using a relatively lower water temperature of 5°C, we can obtain mechanically alloyed amorphous TiAl with a sharp crystallization peak and well-defined glass transition, and realize a reduction of milling time to less than 10 hours by decreasing water flow rate:i.e., increasing plateau temperature.
社団法人粉体粉末冶金協会の論文