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Low-temperature treatment method for eliminating color center of white stone crystal produced by heat exchange method

A technology of heat exchange and low-temperature treatment, which is applied in the directions of post-treatment, crystal growth, post-processing details, etc., to achieve the effect of improving optical transmittance

Inactive Publication Date: 2013-08-07
GUANGDONG FUYUAN TECH CO LTD
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AI Technical Summary

Problems solved by technology

Color center defect is a common defect in white sapphire crystal produced by heat exchange method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0017] Three samples of white sapphire crystals with a thickness of 1.93mm were used, and the same equipment was used. The low temperature treatment parameters of sample 1 were: 1200°C, constant temperature for 12 hours; the low temperature treatment parameters of sample 2 were: 1250°C, constant temperature for 30 hours; sample 3 low temperature The processing parameters are: 1300°C, constant temperature for 48 hours.

[0018] The results measured by spectrophotometer:

[0019] The optical transmittance of sample 1 at 206nm was 4.695% before annealing, and the transmittance after annealing was 84.054%. The optical transmittance at 226nm was 63.670% before annealing, and the transmittance after annealing was 84.592%.

[0020] The optical transmittance of sample 2 at 206nm was 6.696% before annealing, and the transmittance after annealing was 85.898%. The optical transmittance at 226nm was 69.165% before annealing, and the transmittance after annealing was 85.823%.

[0021] The...

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Abstract

The invention discloses a low-temperature treatment method for eliminating the color center of a white stone crystal produced by a heat exchange method, belonging to the technical field of white stone crystal production processes. The low-temperature treatment method is technically characterized by comprising the following steps: (1) cleaning a white stone crystal produced by a heat exchange method, and putting into a resistance furnace taking a silicon carbide rod as a heating element, wherein the resistance furnace has an appropriate air atmosphere or oxygen atmosphere, the temperature uniformity deviation in the furnace chamber is less than + / -5 DEG C, the precision deviation of the heating / cooling rate is less than + / -2 DEG C; and (2) heating at a heating rate of 120-400 DEG C / h from room temperature to 1200-1300 DEG C, keeping the constant temperature for 12-48 hours, then cooling the furnace temperature to room temperature at a cooling rate of 200-400 DEG C / h, and taking out the white stone crystal. The invention aims to provide a low-temperature treatment method for eliminating the color center of a white stone crystal produced by a heat exchange method, which is convenient to operate, favorable in treatment effect and stable in quality; and the low-temperature treatment method is used for eliminating the color center of a white stone crystal.

Description

technical field [0001] The invention relates to a treatment method for white gemstone crystals, and more specifically relates to a low-temperature treatment method for producing color centers of white gemstone crystals by eliminating the heat exchange method. Background technique [0002] White Gem (Al 2 o 3 , pure alumina single crystal, also known as sapphire) due to its high strength, high hardness, high temperature resistance, abrasion resistance, good chemical stability, high ultraviolet-infrared transmittance, excellent electrical insulation performance and a series of excellent physical and chemical properties, Therefore, white sapphire crystal is not only an important basic material in the field of optoelectronics, such as the commercial substrate of GaN epitaxial growth, which accounts for more than 95% of the market, large-scale integrated circuit substrates, superconducting substrates, ferroelectric substrates, but also in the military field. Important optic...

Claims

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Application Information

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IPC IPC(8): C30B29/20C30B33/02
Inventor 周国清缪志峰
Owner GUANGDONG FUYUAN TECH CO LTD
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