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

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Powder Metallurgy and Metal Ceramics Aims and scope

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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REFERENCES

  1. P. I. Loboda, “Zone melting of powdered refractory materials,” Probl. Spets. Metallurgii, No. 2, 59-71 (1999).

  2. P. I. Loboda, “Characteristics of structure formation in zone melting of powdered refractory boron-containing materials,” Poroshk. Metall., Nos. 9-10, 68-76 (2000).

  3. Ya. E. Geguzin and M. A. Krivoglaz, Movement of Macroscopic Inclusions in Solids [in Russian], Metallurgiya, Moscow (1971), pp. 5-62.

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  5. T. I. Serebryakova, V. A. Neronov, and P. D. Peshev, High-Temperature Borides [in Russian], Metallurgiya, Moscow (1991).

  6. P. I. Loboda, V. V. Morozov, V. Ya. Shlyuko, and S. K. Pozhit'ko, “Characteristics of alloy formation in the LaB6 — B system,” in: Borides [in Russian], Inst. Probl. Materials Sci., Ukraine National Acad. Sci., Kiev (1990), pp. 39-45.

  7. P. I. Loboda, “Effect of the porosity of the starting material on the perfection of the structure of grown single crystals,” Probl. Spets. Metallurgii, No. 4, 49-63 (1998).

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  1. National Technical, University of the Ukraine «Kiev Polytechnic Institute,», prosp. Pobedy 37, Kiev 56, 03056, Ukraine

    Petr I. Loboda

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  1. Petr I. Loboda
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Loboda, P.I. Mechanism of Primary Purification in Zone Melting of Boron-Containing Powder Materials. Powder Metallurgy and Metal Ceramics 40, 187–199 (2001). https://doi.org/10.1023/A:1011939808582

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  • DOI: https://doi.org/10.1023/A:1011939808582

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