METHOD FOR MANUFACTURING BORON POWDER BY SELF PROPAGATING HIGH TEMPERATURE SYNTHESIS

摘要

A method for preparing a boron powder by a self-propagating high temperature synthesis process is provided to reduce the preparation costs by economically preparing a high purity fine boron powder having a particle size ranging from several tens of nanometers to several microns in which a magnesium diboride phase is remained using a self-reaction heat of the combustion reaction without additional supply of energy. A method for preparing a boron powder by a self-propagating high temperature synthesis process comprises the steps of: uniformly mixing a boric acid(H3BO3) powder with a magnesium(Mg) powder or a magnesium hydride(MgH2) powder in an inert atmosphere using a ball mill; molding the mixed powder into a cylindrical molded body; injecting the molded body into a self-propagating high temperature synthesis reactor and igniting the molded body, thereby proceeding a self-propagating high temperature synthesis reaction to prepare a boron powder and residues; and repeatedly performing acid treatment and rinsing of the prepared boron powder and residues and performing filtration and drying of the acid treated and rinsed boron powder and residues to remove impurities except the boron powder. The mixing step is performed by mixing the boric acid(H3BO3) powder with the magnesium(Mg) powder or the magnesium hydride(MgH2) powder at a mole ratio range of 1.0:1.0 to 3.0. Further, a condition in the self-propagating high temperature synthesis reactor is vacuum or Ar condition.