Double-layer rotary inner baffle for crystal growth by hydrothermal temperature difference method

Abstract

The invention discloses a double-layer rotary inner baffle for crystal growth by a hydrothermal temperature difference method, and the baffle is arranged in an inner cavity of a hydrothermal autoclaveand comprises an upper baffle and a lower baffle which are equal in size and coincide in axial lead; the distance between the upper baffle (1) and the lower baffle (3) is adjustable; an upper baffledescending through hole (61) and an upper baffle ascending through hole (62) are respectively formed in the upper baffle (1); a lower baffle descending through hole (63) and a lower baffle ascending through hole (64) are respectively formed in the lower baffle (3); the included angle between the orthographic projection of the corresponding upper baffle descending through hole (61) and lower baffledescending through hole (63) and the axis of the upper baffle (1) is larger than 0 degree and smaller than 90 degrees. By adjusting the distance between the two layers of baffles and limiting the rotating angles of the through holes of the upper plate and the lower plate, the convection state of mineralizer liquid is changed, so that the crystal growth rates of the autoclave growth area tend to be consistent, and the crystallization uniformity of crystals is improved.

Description

technical field [0001] The invention relates to the technical field of hydrothermal crystal growth, in particular to an inner baffle located in the crystal growth zone and the raw material dissolution zone of an autoclave. Background technique [0002] The hydrothermal temperature difference method is a widely used crystal growth technology. The main principle of this technology is to imitate the physical and chemical conditions of natural mineral formation in a sealed autoclave, and use the minerals formed by water and corresponding concentrations of chemical reagents under high pressure and specific temperature. The principle that the mineralizer can dissolve some natural minerals, by artificially controlling the temperature difference between the upper and lower parts of the autoclave, the mineralizer aqueous solution that dissolves the minerals in the high temperature area at the bottom, passes through the baffle with a certain opening ratio in the autoclave, Convection ...

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the single-layer baffle is that it cannot control the convection state of the mineralizer in the kettle. The mineralizer directly enters the low-temperature zone through the holes on the baffle and directly impacts the seed wafer, making the crystal growth rate near the raw material dissolution zone slow down, and the The crystal growth rate in the upper part of the crystal growth area becomes faster, resulting in inconsistent crystal growth rates in the upper and lower parts of the same autoclave, resulting in a decrease in crystal uniformity and Q value indicators

[0006] In addition, the distance between the single-layer inner baffle and the inner wall of the autoclave is fixed by the positioning column on the upper part of the seed crystal frame. The defect of this method is that the length of the seed crystal frame is 2.5-3 meters, and there is deformation, which may cause the internal baffle The plate is not concentric with the inner cavity of the autoclave, which leads to uneven radial convection, and finally causes different crystal growth rates in the diameter direction of the autoclave, which affects the uniformity of the crystal

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