人工晶体学报2024，Vol.53Issue(7)：1212-1221,10.
热交换法掺钛蓝宝石晶体生长过程中内辐射传热对晶体热应力的影响
Effect of Internal Radiation Heat Transfer on the Thermal Stress in Growing Ti:Sapphire Crystal by Heat Exchanger Method
摘要
Abstract
Titanium-doped sapphire crystal(Ti∶Al2O3,Ti∶sapphire)is the core material for the development of ultra-fast ultra-high-power laser systems.During the high-quality large-size Ti∶sapphire crystal growth process by heat exchanger method(HEM),internal radiation heat transfer has a significant impact on the heat transport,temperature and thermal stress distributions,and ultimately affects the crystal quality.Therefore,in this paper,the finite volume method is employed to simulate the internal radiation heat transfer within the Ti∶sapphire crystal and melt,while a displacement-based thermoelastic stress model is used to calculate the thermal stress in the crystal.The effects of internal radiation heat transfer on the temperature and thermal stress distributions were investigated in detail.The results show that internal radiation heat transfer significantly enhances the heat transport in the crystal and melt,resulting in dense distribution of isotherms at the bottom of the crystal and a significant increase of temperature gradient and thermal stress in this region.In addition,the thermal stress at the bottom of the crystal first increases and then decreases with the increase of the crystal absorption coefficient(doping concentration).As the absorption coefficient of the melt increases,the temperature gradient and thermal stress at the bottom of the crystal decrease slightly.As the scattering coefficient of the crystal increases,the temperature gradient and thermal stress at the bottom of the crystal gradually decrease.However,this influence is only important after the scattering coefficient is larger than the absorption coefficient.关键词
掺钛蓝宝石/内辐射传热/热应力/数值模拟/热交换法/激光晶体Key words
titanium-doped sapphire/internal radiation heat transfer/thermal stress/numerical simulation/heat exchanger method/laser crystal分类
数理科学引用本文复制引用
于行,赵琪,齐小方,马文成,徐永宽,胡章贵..热交换法掺钛蓝宝石晶体生长过程中内辐射传热对晶体热应力的影响[J].人工晶体学报,2024,53(7):1212-1221,10.基金项目
国家自然科学基金(51906086,52327801) （51906086,52327801）
