Abstract
The connection between zone melting production parameters and structure formation of a porous billet with a moving impurity solvent under conditions of a large temperature gradient and continuous heating is established by experiment. Basic specifications for the impurity solvent are formulated. It is shown that during zone melting the impurity solvent added to the original refractory material powder moves in a temperature gradient field through pores of the sintered skeleton activating compaction and recrystallization processes of the original billet at the level of individual particles and with slow rates of molten front movement without entering the molten zone. This makes it possible to combine the operations of preparing highly dense billets and zone melting.
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REFERENCES
K. T. Vilke, Growth of Crystals, L. A. Reichert (ed.), [Russian translation], Nedra, Leningrad (1977).
A. A. Chernov, E. I. Givargizov, Kh. S. Bagdasarov, et al., Contemporary Crystallography: Growth of Crystals, Vol. 3 [in Russian], Nauka, Moscow (1980).
V. Pfann, Zone Melting [Russian translation], Mir, Moscow (1970).
D. G. Ratnikov, Crucibleless Zone Melting [in Russian], Metallurgiya, Moscow (1976).
V. A. Tatarchenko, Stable Growth of Crystals [in Russian], Nauka, Moscow (1988).
P. I. Loboda, “Effect of original material porosity on structural perfection of crucibleless solidified single crystals,”Probl. Spets. Élektrometallurgii, No. 4, 49-51 (1998).
Kh. S. Bagdasarov, G. A. Arzumanyan, S. N. Ryadnov, et al., “Effect of solidification conditions on the content of gas-forming impurities in leucosapphire crystals,” Kristallografiya, 32, No. 2, 473-477 (1987).
Yu. A. Borodenko, N. P. Katrich, and B. L. Timan, “Features of the formation of gas inclusions during growth of leucosapphire crystals,” Kristallografiya, 32, No. 2, 478-486 (1987).
Ya. E. Geguzin, A. S. Dzuba, and N. V. Kononenko, “Concentration compaction of impurities at the boundary of a moving melt solidification front,” Kristallografiya, 26, No. 3, 571-576 (1981).
Ya. E. Gegusin and A. S. Dzuba, “Role of open inclusions of a supercooled melt in forming gas bubbles at the rear of a solidification front,” Kristallografiya, 26, No. 3, 577-581 (1981).
V. G. Kononenko and Ya. E. Geguzin, “Movement of extraneous inclusions in a crystal at a temperature close to that of melting,” Kristallografiya, 26, No. 3, 157-163 (1981).
D. E. Ovsienko, Generation and Growth of Crystals from Melts [in Russian], Nauk. Dumka, Kiev (1994).
P. I. Loboda, “Physicochemical model of crucibleless zone melting of powder compacts,” in: The Latest Processes and Materials in Powder Metallurgy, Proc. Int. Conf., Kiev (1997), p. 152.
G. V. Samsonov, T. I. Serebryakova, and V. A. Neronov, Borides [in Russian], Atomizdat, Moscow (1975). S. S. Ordan'yan, Yu. B. Paderno, I. K. Khoroshilova, et al., “Interaction in the system LaB6-HfB2,” Poroshk. Metall., No. 2, 79-81 (1984).
P. I. Loboda, V. V. Morozov, and V. Ya. Shlyuko, “Features of alloy formation in the system LaB6-B,” in: Borides [in Russian], Institute for Problems of Materials Science, Acad. Sci. UkrSSR, Kiev (1990), pp. 39-47.
P. I. Loboda, “Zone melting of powder refractory materials,” Probl. Spets. Élektrometallurgii, No. 2, 53-71 (1999).
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Loboda, P.I. Features of Structure Formation with Zone Melting of Powder Boron-Containing Refractory Materials. Powder Metallurgy and Metal Ceramics 39, 480–486 (2000). https://doi.org/10.1023/A:1011322707881
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DOI: https://doi.org/10.1023/A:1011322707881