Mechanism of Primary Purification in Zone Melting of Boron-Containing Powder Materials

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 prim...

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Bibliographic Details
Published in:Powder metallurgy and metal ceramics 2001-03, Vol.40 (3-4), p.187-199
Main Author: Loboda, Petr I
Format: Article
Language:English
Subjects:
Grain size
Heating
Impurities
Purification
Recrystallization
Refractory materials
Solvents
Temperature gradient
Zone melting
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Summary: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.[PUBLICATION ABSTRACT]
ISSN:1068-1302
1573-9066
DOI:10.1023/A:1011939808582