Study on the Temperature of A12O3 Crystal Grown by EFG

Two dimensional equation describing heat conduction--radiation of Al2O3 single crystal was established by light-guide model. The temperature field was calculated by finite-element method and its features were also discussed. Finally, the theoretical result was compared with the experimental result. The convection coefficient has little effect on the temperature of crystal near the solid-liquid interface, while it affects the temperature of crystal significantly which is far from the interface. The temperature gradient near the solid-liquid interface increases with the growth rate increasing. The temperature curves of crystals with different length show that the temperature changes little when the crystal is long, and the temperature field of crystal can be regarded as a quasistatic one.