REACTION CELL OF HIGH-PRESSURE GANG-PUNCH APPARATUS FOR GROWING ASYMMETRICALLY ZONAL DIAMOND MONOCRYSTALS Russian patent published in 2001 - IPC

FIELD: growing diamond monocrystals in gang-punch apparatus, type BARS. SUBSTANCE: monocrystal diamonds are intended for manufacture of various single- crystal diamond tools. Reaction cell includes the following components mounted coaxially; cylindrical heating element with current lead covers and current lead rods, tablets locking the cell and inner insulating bush in whose cavity charge and backing are placed; it has coaxial projection 0.2 to 0.3 mm high at diameter equal to 0.3-0.5 of diameter of backing. Pressed over perimeter of backing are seed crystals made in form of two rings at distance not exceeding sizes of crystals being grown; inner ring of seed crystals is pressed on projection of and outer ring is pressed at distance of 0.8 to 1.0 mm from outer edge of backing; they are oriented in such way one of edges of octahedron should be parallel to tangent to circle of edge of backing; seed surfaces should correspond to plane of octahedron 111 at out-of-flatness not exceeding 3 deg. Besides that, composition of material of backing is as follows: ZrO₂, 70-80; MgO, 5-10; and CsCl, 15-20. EFFECT: possibility of growing asymmetrically zonal diamond crystal in the amount of 20 to 30 ps at most defective part of crystal localized at one edge of crystal in seed zone. 2 dwg