Materials Reports  2019, Vol. 33 Issue (z1): 37-40 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Simulation and Experimental Research on the Effect of Bottom Shield Structure on the Large-size Sapphire Crystal Growth |
| YU Haiqun1,2
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1 Zhejiang Yunfeng New Material Technology Co., Ltd., Jinhua 321015
2 Shanghai Yunfeng Optoelectronictech Co., Ltd., Shanghai 201201 |
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Abstract The radial temperature difference at the bottom of crucible is determined by the bottom shield structure. The morphology of crystal tailing growth is determined by the radial temperature difference at the bottom of crucible. The suitable radial temperature difference at the bottom of crucible can ensure good crystal tail growth and inhibit interface inversion. CFD software was used to simulate the effects of different bottom shield structure on the crystal power, the radial temperature difference at the bottom of crucible and the convexity. The results show that the smallest crystal power, the largest radial temperature difference at the bottom and the largest convexity can be obtained by using the splitting bottom shield structure whenever the shouldering and the tailing stage. According to the optimized results, the splitting bottom shield structure was used to carry out the experiment of crystal growth. The bottom surface of the crystal showed annual rings and the crystal quality was good.
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Published: 05 July 2019
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| About author:: 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. More than 10 articles have been published in important journals at home and abroad, and more than 10 patents have been declared. |
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