环境参数对GOI法蓝宝石晶体生长影响分析

利用数值模拟分析的方法,对GOI法(又称泡生法)蓝宝石晶体生长过程进行模拟,分析了系统的环境参数变化对晶体生长的固液界面凸出率和晶体内温度分布、温度梯度的影响．结果表明：热交换器的热对流系数和工作流体的温度变化对晶体生长的固液界面凸出率和温度梯度具有相同的影响效果；在晶体长到一定尺寸后,只靠加大热交换器的取热能力,不足使晶体继续生长．通过降低系统的加热能力,减少传入坩埚内的热量,可使晶体继续长大．加热系统的环境温度和组合热对流系数对晶体生长具有相似的影响趋势,但影响效果却不同,环境温度越高时,固液界面凸出率越小．

Numerical simulation of environmental parameters' effect on sapphire crystal growth with GOI method

This paper makes use of numerical simulation analysis on method of GOI growing sapphire.The a- nalysis includes how parameter change of the system environment influences on project ratio of solid-liquid interface,temperature distribution of crystals inside and temperature gradient influence on crystals growing. The results show that thermal convection coefficient of thermal exchanger and temperature change of target liq- uid have the same effect on project ratio of solid-liquid interface and temperature convection.Even when crystals grow to a certain size,if we just depend on enlarge the acquiring thermal ability of thermal exchanger; we can not make crystals continue growing.On the other way,we can have crystals continue to growing through depress heating ability of heater to make less thermal go into the pot.There is the resemble influence from environment temperature of heater and association thermal convection coefficient,but environment tem- perature higher and project ratio of solid-liquid interface lower.