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
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[0016] Experimental example
[0017] Three white sapphire crystals with a thickness of 1.93mm are used. Using the same equipment, the low temperature treatment parameters of sample 1 are: 1200℃, constant temperature for 12 hours; sample 2 low temperature treatment parameters are: 1250℃, constant temperature for 30 hours; sample 3 is low temperature The treatment parameters are: 1300°C, constant temperature for 48 hours.
[0018] Measured result by spectrophotometer:
[0019] The optical transmittance of sample 1 at 206nm is 4.695% before annealing, 84.054% after annealing, the optical transmittance at 226nm is 63.670% before annealing, and the transmittance after annealing is 84.592%.
[0020] The optical transmittance of sample 2 at 206nm is 6.696% before annealing, and the transmittance after annealing is 85.898%. The optical transmittance at 226nm is 69.165% before annealing, and the transmittance after annealing is 85.823%.
[0021] The optical transmittance of sample 3 at 206n...
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