A spherical high-pressure reactor for hydrothermal crystal growth

Abstract

The invention discloses a spherical high-pressure reaction kettle for hydrothermal crystal growth. The spherical high-pressure reaction kettle comprises a kettle body, wherein the kettle body is a solid sphere; a chamber is longitudinally formed from the kettle body surface to the kettle body inside on the kettle body to form a kettle cavity of the kettle body; and a dissolution area and a crystallization area exist in the kettle cavity. By adopting the high-pressure reaction kettle to perform hydrothermal artificial crystal growth, a stable temperature field with double temperature areas can be realized, solution convection in the kettle cavity is slowed down, seed crystal corrosion is avoided, and fast and stable growth of crystal is promoted.

Description

technical field [0001] The invention relates to a device for growing crystals by hydrothermal method, in particular to a spherical high-pressure reactor for growing crystals by hydrothermal method. Background technique [0002] Hydrothermal crystal growth is a method of crystallization in a supersaturated solution under high temperature and pressure. Hydrothermal crystal growth has the following advantages: (1) Crystals can grow at a temperature far below their melting point, which solves the problem that some crystals decompose before the melting point or undergo crystal transformation far below the melting point; (2) It can reduce the viscosity of the solution and overcome the disadvantages of high cooling viscosity and easy formation of vitreous bodies during the growth of some crystals by the molten salt method; (3) it is easy to grow into large and uniform crystals, and the obtained crystals have a relatively complete shape and crystal structure. (4) The hydrothermal m...

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Problems solved by technology

The crystals grown in this straight dual-temperature zone autoclave have the characteristics of small thermal stress, small macroscopic defects, good crystal uniformity, and high transmittance. However, this autoclave also exposed some difficult problems in the actual industrialization process. For example, the kettle body is sensitive to temperature fluctuations and is severely affected by the external environment, which is not conducive to the stable growth of crystals; the boundary between the crystallization zone and the dissolution zone deviates, which will cause the seed crystal to dissolve or the bottom crystal growth to stagnate in severe cases; The crystals obtained from the kettle growth become smaller and smaller from top to bottom (the growth rate is significantly reduced), and the yield and growth efficiency are reduced; the air convection in the vertical direction between the furnace body (heating equipment) and the autoclave wall is strong, and it is difficult to accurately Controlling the temperature field, there is a deviation between the experimental growth temperature and the set value, and it is impossible to obtain single crystal products with quality and quantity

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