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The invention relates to the technology of crystals growing, in particular to thermal equipment being used in growing corundum and can be used in the industrial growing thereof. The heat shield for growing monocrystals of corundum ? û Al2O3 includes the system of cylinders of molybdenum or alloys thereof coaxially disposed first relative to the second, and the space between the first and the second cylinders relative to the heater is lined with vertically disposed bars of tungsten or sintered mixture of molybdenum and tungsten powders. The first cylinder relative to the heater contains a removable insert in the form of a ring of sheet molybdenum or alloys thereof, at that the height thereof is smaller or is equal to 10 % of the first cylinder height. The invention provides stabilization of heat conditions in the crystallization unit during many processes of crystals growing.
INDUCTION MELTING APPARATUS EMPLOYING HALIDE TYPE CRUCIBLE, PROCESS FOR PRODUCING THE CRUCIBLE, METHOD OF INDUCTION MELTING, AND PROCESS FOR PRODUCING INGOT OF ULTRAHIGH-PURITY Fe-, Ni-, OR Co-BASED ALLOY MATERIAL