无机材料学报

• 研究论文 • 上一篇    下一篇

蓝宝石单晶的气孔形成研究

姚泰, 韩杰才, 左洪波, 孟松鹤, 张明福, 李常青   

  1. 哈尔滨工业大学复合材料研究所, 哈尔滨 150001
  • 收稿日期:2007-05-22 修回日期:2007-07-04 出版日期:2008-05-20 网络出版日期:2008-05-20

Bubble Formation in Sapphire Single Crystals

YAO Tai, HAN Jie-Cai, ZUO Hong-Bo, MENG Song-He, ZHANG Ming-Fu, LI Chang-Qing   

  1. Research Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China
  • Received:2007-05-22 Revised:2007-07-04 Published:2008-05-20 Online:2008-05-20

摘要: 采用冷心放肩微量提拉法(SAPMAC法)生长的蓝宝石晶体, 气孔是其主要缺陷. 本文探讨了影响气孔形成的工艺因素, 从晶体生长动力学角度分析了气孔形成机理. 结果表明, 通过优化温场、选择合适的生长速度及控制微凸固/液界面形状, 可有效降低晶体中气孔的数量.

关键词: 气孔形成, 蓝宝石晶体, 冷心放肩微量提拉法

Abstract: Sapphire single crystal was grown by micro-pulling and shoulder at cooled center (SAPMAC) technique and the air bubbles were observed as one of the main defects in the as-grown crystals. Based on the growth parameters, the formation mechanism of the bubbles was discussed in the view of the crystal growth kinetics. It suggests that optimizing the temperature distribution in the furnace, selecting a suitable growth velocity and adopting a slightly convex interface to the melt can effectively reduce the quantity of bubbles.

Key words: bubble, sapphire crystal, SAPMAC

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