FIELD: chemistry.
SUBSTANCE: apparatus has a vacuum chamber 1, an electric heater 4, a crucible for melting raw material 6, inside the heater 4, a holder 7 and heat shields 8, lying between the electric heater 4 and water-cooled walls 1a, 1b of the vacuum chamber 1. Part of the shields 8 has a mirror surface facing the heater, which lies in a sealed cavity formed by welding butt-ends of cowlings of neighbouring shielding sheets in spaces between which separators are fitted and that cavity is then evacuated.
EFFECT: maximum coefficient of reflection of heat flux, low heat loss, improved parametres of the temperature field and quality of articles, low electrical energy and power of the heaters.
8 cl, 6 dwg
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