アトマイズ粉末の凝固

概要

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By blowing nitrogen gas, argon gas or compressed air on the molten metal of Al-4.5%Cu alloy which was discharged from the molten metal nozzle fixed at the bottom part of graphite crucible, powder was formed. The structure of solidification and cooling rate of the powder was examined. The result of the above experiment is summarized as follows : The particle shape was not spherical but tear-drop-like, and not affected by any kind of atomizing gas used in this process. And the powder showed the particle distribution pattern with its peak between -48 and +100 mesh. In the case of atomizing nitrogen gas, dendrite arm spacing turned out to be about between 1 and 9μm. From this dendrite arm spacing, the cooling rate was identified to be about 50 to 6,500℃/sec. The value of the heat transfer coefficient at the powder-gas interface was about 89 to 577J/m^2・sec・K.
東海大学の論文