APPARATUS FOR GROWING CRYSTALS Russian patent published in 2014 - IPC C30B15/00 C30B15/14 

FIELD: chemistry.

SUBSTANCE: apparatus includes a housing 7 in which there is a seed holder 6, a graphite heater 3 with shielding and a water cooling system. The shielding is in the form of a multilayer sandwich structure with at least two structural components, each comprising a first layer 4 in the form of a carbon-carbon-containing composite or porous felt and a second layer 5 in the form of silicon carbide.

EFFECT: invention improves uniformity of the heat field in the radial direction within the heated space, enables to create a linear axial temperature gradient and reduce contamination by uncontrolled impurity elements, eg, nitrogen, oxygen, aluminium, iron and, as a result, obtain crystals of higher quality.

7 cl, 6 dwg, 4 tbl, 11 ex