Methods for making metal particle spherical and removing oxide f

Details Methods for making metal particle spherical and removing oxide f Methods for making metal particle spherical and removing oxide f

1995-01-03

1997-04-01

Wyszomierski, George

Specialized metallurgical processes, compositions for use therei

Processes

Spheroidizing or rounding of existing solid metal particles

75370, 134 2, B22F 100, C23G 500

Patent

active

056161646

ABSTRACT:
Metal such as solder is immersed in a heating medium containing a rosin or derivative thereof and an organic solvent and heated to a temperature above the melting point of the metal, to remove the oxide film of the metal and make the metal spherical. If a hardened caster oil or high softening point rosin or derivative thereof is further added as a thickener to the heating medium, the size increase of the metal particle can be prevented. By heating at a temperature lower than the melting point of the metal, the oxide film can be removed without making the particles spherical. Using thus obtained solder particles, fluxless soldering can be done. Also, a fluxless soldering method is provided.

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