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Planetary rotating solution method crystal growth device

A crystal growth, planetary technology, applied in the direction of crystal growth, single crystal growth, solution from liquid solvent at room temperature, etc., can solve the problems of slowness, adverse effects on solution stability, lower solution mixing efficiency, etc., to reduce fluctuations, Sufficient supply of solute, eliminating the effect of mixing isolation

Inactive Publication Date: 2018-02-06
CHONGQING UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two vortex cell areas are also called mixing isolation areas, and the flow is dominated by extremely slow axial laminar flow, which greatly reduces the mixing efficiency of the solution and adversely affects the stability of the solution.

Method used

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  • Planetary rotating solution method crystal growth device
  • Planetary rotating solution method crystal growth device
  • Planetary rotating solution method crystal growth device

Examples

Experimental program
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Effect test

Embodiment

[0035] This example takes the growth of large-sized KDP crystals by point seed crystal method as an example, see figure 1 . The crystal tray 3 carrying the KDP crystal 2 is placed in the growth container 1 filled with the supersaturated solution. The crystal tray 3 is connected with the rotation drive motor 5 through the support rod 4 . The rotation driving motor 5 is installed on the rotating tray 6, and drives the KDP crystal 2 to rotate forward and backward periodically at a certain speed. The rotating tray 6 is driven by the revolution driving motor 7 to rotate at a constant speed at a certain speed, thereby driving the KDP crystal 2 to perform a planetary revolution at a constant speed. So far, the planetary rotation motion of KDP crystal 2 during the growth process has been realized, and its motion trajectory can be referred to figure 2 . In addition, in order to prevent evaporation of solvent and intrusion of external pollutants during the growth process, the growt...

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Abstract

The invention provides a planet type rotational solution process crystal growth apparatus, comprising a growth container, a planet rotary water seal, a planet drive mechanism and a crystal tray. An output end of the planet drive mechanism is connected with the crystal tray through a supporting rod, and within the growth container the crystal tray is driven to auto-rotate and to planetarily revolve. In the invention, crystal is driven to auto-rotate and planetarily revolve independently by two motors, and the crystal can revolve at constant speed and positively or reversely auto-rotate in a periodic manner. Suitable crystal auto-rotation period and speed are selected, similarity of growth conditions of facets in the crystal growth process is maximally improved, and conical facets or cylindrical facets are kept uniform in growth rate. Compared with the purely crystal auto-rotation manner, the apparatus enables a solution to be more fully mixed, thus greatly improving the uniformity of concentration and temperature distribution in the solution; meanwhile, crystal deceleration, rotation stopping and severe fluctuation of solute supply in the accelerated auto-rotation process are eliminated.

Description

technical field [0001] The invention relates to a new solution method crystal growth device for planetary rotation of crystals, which belongs to the technical field of crystal growth. Background technique [0002] During the crystal growth process of the solution method, the periodic positive and negative rotation of the crystal is a commonly used technical means. Almost all large-size crystal growth processes are carried out by the crystal rotation method, and the rotation conditions greatly affect the growth rate and quality of the crystal. . Taking the growth of large-sized KDP crystals as an example, when the rotation speed is lower than 25rpm, defects such as inclusions can be seen in many crystal planes of the crystal; when the rotation speed is 25-40rpm, some of the crystal planes in the grown crystals are facing visible inclusions. Defects such as objects; and when the rotational speed reaches above 40rpm, inclusions rarely appear in the crystal. At the same time, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B7/00
CPCC30B7/00
Inventor 胡志涛李明伟尹华伟王鹏飞周川
Owner CHONGQING UNIV
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