摘要
对泡生法生长蓝宝石单晶进行了数值模拟,计算分析了晶体温度场分布规律。通过改变顶部保温屏的层数、侧壁保温屏的层数、反射屏的开口半径大小,分析热场的影响,得到了各参数与温度分布及温度梯度的变化关系。模拟发现,适当减少顶部保温屏层数,增大反射屏开口,可以增加晶体径向温度梯度;适当增加顶部保温屏层数,增大反射屏开口,可减小晶体轴向温度梯度。而侧壁屏层数几乎无影响。最后将分析结果与实验相结合,进行实验验证,成功获得了质量较好的蓝宝石单晶。
A numerical simulation for sapphire crystal growth by kyropoulos method was conducted in this paper. The temperature distributions of crystal were calculated,and their features were also discussed.By varying the layers of top wall insulation,layers of side wall insulation and opening radius of radiation shield,the effects of heat shield were investigated. The results show that,to increase radial temperature gradient of crystal,layers of top wall insulation need to be decreased,opening radius of radiation shield be increased. On the other hand,to decrease axial temperature gradient of crystal,layers of top wall insulation need to be increased,opening radius of radiation shield be increased. However,layers of side heat insulation had little effect on temperature. Combining the simulation results with the experimental results,the structure of thermal field was optimized, and good-quality sapphire was successfully obtained.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第11期2799-2805,共7页
Journal of Synthetic Crystals
基金
江苏省产学研前瞻性联合研究项目(BY2012005)
关键词
泡生法
数值模拟
蓝宝石
单晶炉
热场
kyropoulos
numerical simulation
sapphire
thermal field
