METHOD OF FABRICATION OF MONO CRYSTAL SPINEL PLATES (VERSIONS) Russian patent published in 2008 - IPC C30B29/26 C30B33/02 

FIELD: metallurgy.

SUBSTANCE: invention refers to fabrication of items with spinel crystal structure, including such items as boules, plates and bases, and also refers to active units comprising such items. According to one variant the method of fabricating mono crystal spinel plates includes the following operations: obtaining a portion of melt in a crucible, formation of spinel mono crystal boule out of melt at process coefficient of mould determined as ratio of medium diameter of the boule to interior diameter of the crucible and equal approximately to not less than 0.44, at that the boule has common formula aAD.bE₂D₃, where A is chosen from the group, which includes Mg, Ca, Zn, Mn, Ba, Sr, Cd, Fe as well as their combinations, and E is chosen from the group which includes Al, In, Cr, Sc, Lu, Fe and their combinations, and D is chosen from the group which includes O, S, Se and their combinations, at that the ratio b:a> 1.5:1, so the spinel is concentrated E₂D₃, and then cutting the boule into plurality of plates. Such items possess reduced mechanical stress which facilitates increased output of ready items.

EFFECT: increased degree of output of ready items.

17 cl, 11 dwg, 1 tbl, 1 ex