Abstract
The formation of powders in an electric discharge with heavy current through a metallic wire in the atmosphere was studied, and the characteristics of the resulting powder were examined.
The results obtained were as follows.
(1) The powders obtained at the optimum conditions had a wide particle size distribution. Coarse particles were spherical similar to atomized ones.
(2) With increasing discharging voltage, particles of molybdenum powder became fine. As for tungsten, the above mentioned tendency was not confirmed with X-ray diffraction line breadth alone.
(3) In the atmosphere, metallic powder was collected mainly in an acryl case, and the particle size had a wide distribution.
However, in a vacuum cleaner, the ultra fine oxide powder (aerosol) was mainly collected.
(4) The alloy powder was formed easily from alloy wire by wire-explosion method.
(5) As for molybdenum, with increasing discharging voltage, the latice spacing increased.
