2022 №04 (04) DOI of Article
2022 №04 (06)

Electrometallurgy Today 2022 #04
Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2022, #4, 27-33 pages

Investigation of energy balance in the system of the crystal‒high-frequency heating module at plasma-induction growing of refractory metal single-crystals

V.O. Shapovalov, Yu.O. Nykytenko, O.M. Gnizdylo, V.R. Burnashev, O.V. Karuskevych, T.I. Dubova, V.V. Yakusha

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

Considered is the issue of optimization of the design of the induction heating module at development of the equipment and technology for plasma-induction growing of superlarge refractory tungsten single-crystals in the form of bodies of revolution. The influence of induction module geometry on energy characteristics of the system of multisection inductor–single crystal was studied and the most rational design of the high-frequency heater was developed. The nature of distribution of the specific density of thermal energy over the surface of the crystal that is heated in the high-frequency field of the inductor of a particular geometry, ensures formation of the specified temperature field and a certain level of temperature gradients in the volume. An experimental procedure for determination of heat-loaded components of the equipment using a metal water-cooled simulator was applied as the main research tool. It is shown that the average electric efficiency of the induction module for the first variant of module design is equal to 40, for the second to 36, and for the third to 32 %. It was established that the first variant is characterized by a more uniform heating along the ingot height with specific power of 51, 53 and 54 W/cm2 for the first, second and third sections of the module, respectively. The electric efficiency of the system, established in keeping with the applied procedure, essentially simplifies the process of complex calculations of inter-related problems of the electromagnetic field and non-stationary heat conductivity and it can be used as initial data for analysis of the efficiency and rational design of the high-frequency heating module. Ref. 14, Tabl. 3, Fig. 3.
Keywords: tungsten single-crystal; plasma-induction method; induction heating module; inductor; calorimetry

Received 21.07.2022


1. Li Juan, Hu Xiao-Bo, Wang Ying-Min et al. (2007) Comparison of different crucible materials for the growth of AlN crystals. Chinese J. Struct. Chem., 26(10), 1203-1207.
2. Dhanaraj, G., Byrappa, K., Prasad, V. (2010) Springer Handbook of Crystal Growth. Berlin Heidelberg, Springer-Verlag. https://doi.org/10.1007/978-3-540-74761-1
3. Miyagawa, C., Kobayashi, T., Taishi, T. et al. (2013) Demonstration of crack-free c-axis sapphire crystal growth using the vertical Bridgman method. J. of Crystal Growth., 372, 95-99. https://doi.org/10.1016/j.jcrysgro.2013.03.006
4. Schlesser, R., Dalmau, R., Zhuang, D. et al. (2005) Crucible materials for growth of aluminum nitride crystals. Ibid., 281, 75-80. https://doi.org/10.1016/j.jcrysgro.2005.03.014
5. Glebovsky, V. (2019) Crystal growth. https://doi.org/10.5772/intechopen.73360
6. Shapovalov, V., Yakusha, V., Manulyk, A. (2015) Large refractory metals single crystals grown by plasma-induction zone melting. Proc. of XXIV Inter. Materials Research Congress- 2015 (August 16-20, 2015 Cancun, Mexico). Sociedad Mexicana de Materiales A.C., S6B-O007.
7. Shapovalov, V., Nikitenko, Yu., Yakusha, V. et al. (2020) Manufacture of super large tungsten single crystals in the form of rotation bodies. Problems of Atomic Sci. and Technol., 125(1), 60-63. https://doi.org/10.46813/2020-125-060
8. Paton, B.E., Shapovalov, V.A., Grigorenko, G.M. et al. (2016) Plasma-induction growing of profiled single crystals of refractory metals. Kyiv, Naukova Dumka [in Russian]. https://doi.org/10.15407/tpwj2016.06.23
9. Grigorenko, G.M., Shejko, I.V. (2006) Induction melting of metals in cold crucibles and sectional moulds. Kyiv, Stal [in Russian].
10. Shejko, I.V., Vysotsky, G.A., Latash, Yu.V. et al. (1988) Investigation of energy characteristics of inductor-mould system of induction remelting units in sectional mould. Problemy Spets. Elektrometallurgii, 2, 62-65 [in Russian].
11. Yakusha, V.V. (2017) Improvement of technology for growing of tungsten large flat single crystals in furnace with plasma- induction heating: Syn. of Thesis for Cand. of Tech. Sci. Degree. Kyiv, PWI [in Ukrainian].
12. Yurasov, E.V. (1938) Tube generators and transmitters. Moscow, Voienizdat [in Russian].
13. Zinoviev, V.E. (1989) Thermophysical properties of metals at temperatures: Refer. Book. Moscow: Metallurgiya [in Russian].
14. Slukhotsky, A.E., Nemkov, V.S., Pavlov, N.A. et al. (1981) Induction heating units: Manual for higher school educ. Leningrad, Energoizdat [in Russian].

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