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Crystal growth process control method based on solution concentration online estimation

A technology of crystal growth and solution concentration, applied in the directions of crystal growth, single crystal growth, single crystal growth, etc., can solve the problem of inability to measure the concentration of the growth solution online, and achieve the effect of ensuring quality, stable growth rate, and fast growth rate

Active Publication Date: 2020-12-25
西安翱翔新材料科技有限公司
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Problems solved by technology

Growth solution supersaturation σ=(growth solution concentration-growth solution equilibrium concentration) / growth solution equilibrium concentration, growth solution equilibrium concentration is related to the temperature of the solution, but the growth solution concentration cannot be measured online during crystal growth

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  • Crystal growth process control method based on solution concentration online estimation
  • Crystal growth process control method based on solution concentration online estimation
  • Crystal growth process control method based on solution concentration online estimation

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Embodiment Construction

[0034] The specific implementation of the patent of the present invention will be further described below in conjunction with the accompanying drawings.

[0035] An application of an on-line control method for the supersaturation of a growth solution in a crystal growth process, comprising the following implementation process:

[0036] (1) Potassium dihydrogen phosphate growth solution is loaded into the crystal growth tank, and after the crystal nucleus is placed on the crystal carrier, the system enters the operation preparation state, and the setting of the initial setting value is carried out on the touch screen: T 1 (0) = 60.00°C, T 1min =25°C; T 2 (0)=0.02°C / hour, T 2max =0.05°C / hour, T 2min =0.01°C / hour; M(0)=1000,000g, C(0)=0.300g crystal / g solution, F(0)=2.00%, F max = 4.00%, F min = 1.00%; H 1 (0)=5.0cm, H 2 (0)=2.5cm, D(0)=5.0cm; ρ s =2.34g / cm 3 , σ s =6.0%; k=0, T=0.

[0037] (2) The system enters the automatic operation state, and the timer T starts tim...

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Abstract

The invention relates to a crystal growth process control method based on solution concentration online estimation, and belongs to the field of production process control. The crystal growth system comprises a growth device, a control device and a vision-based size detection device. And a crystal carrying frame rotates clockwise, stops, rotates anticlockwise and stops to circularly operate. When the crystal carrying frame stops rotating, the size of the growing crystal is detected on line through a visual system, the concentration of the growing solution is estimated on line according to the size of the growing crystal so as to calculate the supersaturation degree of the growing solution, the cooling rate of the growing solution is adjusted regularly according to the supersaturation degreerequirement, and the temperature of the growing solution is changed. According to the method, the temperature of the growing solution is changed through the change of the supersaturation degree of the growing solution, so that the crystal can have a stable and rapid growth speed, and the quality of the crystal can be guaranteed.

Description

technical field [0001] The invention relates to a novel crystal growth control system, in particular to a crystal growth process control method based on online estimation of solution concentration, belonging to the field of production process control. Background technique [0002] KDP (potassium dihydrogen phosphate, KH2PO4) crystal is a nonlinear electro-optic material with excellent performance developed in the 1930s and 1940s. The crystal grown by this aqueous solution method has a large electro-optic nonlinear coefficient and a high laser damage threshold, and is widely used in technical fields such as laser frequency conversion, electro-optic modulation, and optical fast switching. Over the years, with the application of high-power laser systems in controlled nuclear fusion, large-sized KDP crystals have become the only nonlinear optical materials currently available for inertial confinement fusion (ICF) engineering. [0003] The traditional cooling method to grow larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B7/08C30B29/14
CPCC30B7/08C30B29/14
Inventor 潘丰
Owner 西安翱翔新材料科技有限公司
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