A METHOD FOR SYNTHESIS OF INGOING BILLETS OF CORUNDUM IN THE FORM OF POLYCRYSTALLINE INGOTS FOR GROWING CRYSTALS OF SAPPHIRE AND INSTALLATION THEREFORE

摘要

The invention relates to a method for synthesis of ingoing billets of corundum in the form of polycrystalline ingots for growing crystals of sapphire, comprising introduction of a fusion mixture of aluminum oxide powder into a cold crucible, creating a high-frequency electromagnetic field with an inductor and initial melting of the fusion mixture, heating the melt in the high-frequency electromagnetic field of the inductor, feeding an additional portion of the fusion mixture in the cold crucible and its melting, crystallization the melt in the form of a polycrystalline ingot during a vertical shifting of the cold crucible with respect to the inductor, termination of the induction melting by switching off the high-frequency field of the inductor, cooling the polycrystalline ingot in the cold crucible, removing the polycrystalline ingot from the cold crucible and repeating the whole cycle from the introduction of the fusion mixture into the cold crucible and its initial melting, characterized in that after termination of the induction melting and switching off the high-frequency field of the inductor, the cold crucible (5) with the polycrystalline ingot (16) is taken out of the inductor (4) and in its place a second identical cold crucible (6) is introduced and the cycle is repeated to obtain another polycrystalline ingot (17) in the second identical cold crucible (6), wherein the cooling of the previously produced polycrystalline ingot (16) is carried out simultaneously with the synthesis of the next polycrystalline ingot (17) and removing the polycrystalline ingot (16) from the cold crucible (5) is carried out after the induction melting of the next polycrystalline ingot (17) has been terminated. The invention covers also an installation for carrying out this method.