Materials Reports  2021, Vol. 35 Issue (Z1): 186-188 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| The Numerical Simulation and Experimental Research on the Effect of Necking Diameter on the Shoulder Expansion |
| WANG Haibo1,2, YU Haiqun1,2, TONG Shuiguang3, TANG Ning3, XU Yongliang1,2
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1 Zhejiang Yunfeng New Material Technology Co. ,Ltd, Jinhua 321015, China
2 Shanghai Yunfeng Optoelectronictech Co. ,Ltd, Shanghai 201201, China
3 School of Mechanical Engineering Zhejiang University, Hangzhou 310058, China |
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Abstract 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.
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Published: 16 July 2021
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| About author:: Haibo Wang, senior engineer, received his master's degree from East China University of Science and Technology in January 2016. He joined Shanghai Yunfeng Optoelectronictech Co. ,Ltd in 2010. He focused on the automatic crystal growth、thermal field designing of sapphire and project management.Haiqun Yu received his Ph. D. degree from Jiangsu University in June 2012.Then the same year,he joined Shanghai Yunfeng Optoelectronictech Co. ,Ltd. He focused on the crystal growth and designing thermal field of sapphire. |
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