提拉法蓝宝石生长过程中包裹体杂质对界面的影响

Global modeling (2D/3D) has been performed to investigate the effects of different melt inclusions on the interface shape during the Czochralski sapphire crystal growth. The purpose is to obtain the growth interface shape accurately. Through changing optical properties at the local position during the calculation of the radiation, interface shapes with the presence of the various inclusions are obtained. The results show that, inclusions at the center of the crystal or at the region close to the crystal surface make the corresponding parts of interface distorted. Opaque inclusions make local interface distorted up, while transparent inclusions cause local interface distorted down. It is further found that three-dimensional effects cause non-axisymmetric temperature distribution and fluid flow in the growth furnace.