DEVICE FOR CRYSTALLISATION OF LEUCOSAPPHIRE MELT Russian patent published in 2008 - IPC C30B11/00 C30B29/20 

FIELD: chemistry.

SUBSTANCE: device for crystallisation of leucosapphire melt contains vacuum chamber, in which thermally are placed: insulated chamber, vacuum pump, connected with vacuum chamber by means of branch pipe, thermal energy source, boat with charge, located on common with thermal energy source axis, vacuum depth sensor, connected with vacuum chamber by means of branch pipe, melt temperature sensor, electric power supply unit, connected with input with electricity network and control unit, which by means of first input is connected with vacuum pump input, and by means of second input - with thermal energy source, introduced into system are: channel of optical connection passing through walls of thermally insulated and vacuum chambers to outer surface of vacuum chamber, and oriented with maximum of diagram of radiation direction at boat content, connected with its output with optical input of melt temperature sensor, electromechanical drive of boat movement, connected with its output with boat, electric magnet, located on the same axis as thermal energy source in thermally insulated chamber and connected galvanically with third output of control unit, first master - master of boat content temperature, first element of comparison, connected by discharge by first inputs with outputs of melt temperature sensor, by second inlets - with first master outputs, by first output - with first controlling input of control unit, time impulse generator, impulse distributor, connected by signal input with impulse generator output, by controlling input - with second output of first element of comparison, and by output - phase-by phase with inputs of electromechanical drive of boat movement, analog-digital converter, connected by its input with output of vacuum depth sensor, second master - master of vacuum depth in vacuum chamber, second element of comparison, connected discharge-by-discharge by first inputs with outputs of second master, and with second inputs - with outputs of vacuum depth sensor in vacuum chamber, and OR element, connected by first input with output of second element of comparison, by second input - with first output of first element of comparison, and by output - with second controlling input of control unit, control unit being connected by power inputs with outputs of power supply unit, by first output - with input of vacuum pump, with second output - with input of thermal energy source, sensor of vacuum depth in vacuum chamber is made on inverse-magnetron vacuum-meter, sensor of melt temperature - on multi-channel and radiation pyrometer, and electromechanical drive of boat movement - on step engine.

EFFECT: improvement of properties of leucosapphire crystals (dielectric inductivity up to ε = 5,63, against ε = 5,87 and flintiness up to N = 9,23, against 8,96), extension of technological parameter ranges, temperature and depth of vacuum, higher accuracy of technological process of leucosapphire crystal growing with simultaneous minimization of time and energy consumption.

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