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Abstract
We have established the regular behavior of the change in chemical composition and grain size of refractory material when sintered in the presence of a moving liquid phase under conditions including a high temperature gradient and continuous heating, and on this basis we propose a mechanism for primary purification to remove impurities from boron-containing powder materials during zone melting. We have shown that the degree of purification depends on the completeness of recrystallization of particles of the refractory material through the solvent melt, and is determined by the physical and processing properties of the original powders, the temperature and time parameters for the zone melting, the structure of the phase diagram, and the kinetics of diffusional interaction processes in the system refractory material ― solvent for the impurities.
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