引晶直径对扩肩形态影响的数值模拟及实验研究  

The Numerical Simulation and Experimental Research on the Effect of Necking Diameter on the Shoulder Expansion

作　　者：汪海波 于海群 童水光[3] 唐宁[3] 徐永亮 WANG Haibo;YU Haiqun;TONG Shuiguang;TANG Ning;XU Yongliang(Zhejiang Yunfeng New Material Technology Co.,Ltd,Jinhua 321015,China;Shanghai Yunfeng Optoelectronictech Co.,Ltd,Shanghai 201201,China;School of Mechanical Engineering Zhejiang University,Hangzhou 310058,China)

机构地区：[1]浙江昀丰新材料科技股份有限公司,金华321015 [2]上海昀丰光电技术有限公司,上海201201 [3]浙江大学机械工程学院,杭州310058

出　　处：《材料导报》2021年第S01期186-188,共3页Materials Reports

摘　　要：引晶直径的大小直接决定晶结的导热能力,晶结导热能力的大小影响固液界面的凸出度。晶结直径越小,晶结导热能力越差,固液界面凸出度越小,而扩肩角越大,扩肩面的斜度越小,扩肩面趋于平缓;反之,晶结直径越大,晶结导热能力越强,固液界面凸出度越大,则扩肩角越小,扩肩面的斜度越大,扩肩面趋于陡峭。依据理论分析及CFD的模拟结果,对200 kg级晶体进行了引晶及长晶实验,结果显示,在同等长晶工艺条件下,随着引晶直径的增加其放肩界面变陡峭,验证了理论分析的正确性。The thermal conductivity of necking crystal is determined by the necking diameter,also the convexity is determined by the thermal conducti-vity of necking crystal.The smaller the necking diameter is,the worse the thermal conductivity of necking crystal is,the smaller the conve-xity of solid-liquid interface is,and the bigger the shoulder expansion angle is,the smaller the slope of shoulder expansion surface is,and the shoulder expansion surface tends to be flat;conversely,the bigger the necking diameter is,the stronger the thermal conductivity of necking crystal is,and the bigger the convexity of solid-liquid interface is,the smaller the shoulder expansion angle is,the bigger the slope of shoulder expansion surface is,and the shoulder expansion surface tends to be steep.According to the theoretical analysis and CFD simulation results,the experiments of 200 kg crystal growth is carried out.The results show that the shoulder interface becomes steeper with the increase of the necking dia-meter under the same crystallization process conditions,which verifies the theoretical analysis.

关 键 词：蓝宝石 引晶直径 数值模拟 实验研究 

分 类 号：O78[理学—晶体学]