抄録
Flame spraying gun was applied to the production of pure Al and AI-5.4%Si alloy powders. For the purpose of obtaining rapidly cooled powders the metallic sprays were injected into static water in stainless steel vessel, dynamical water and dynamical liquid nitrogen in rotary copper drum, respectively.
Some characteristics of the powders obtained were estimated with reference to the particle size distribution, particle shape, degree of oxidation and cooling rate of powders.
The shape of the powders obtained from this experiment was similar to that of commercial water atomized Al powder. The cooling rate of Al-5.4%Si powder estimated from the dendrite arm spacing was about 104 K/s, and the solubility of Si in Al powder measured at room temperature was about 3 wt% which was approximately twice as much as that of equilibrium state at the eutectic temperature of 830 K.
