单晶炉保温与热屏优化的数值模拟与改造

Numerical Simulation Optimization and Equipment Transformation of Thermal Insulation and Guide Shell in Crystal Furnace

改进CG6000型单晶炉的热场,增加下保温碳毡和上保温罩,改一段式导流筒为三段式导流筒。通过CGsim模拟软件的晶体生长模拟,对比了改进前与改进后的热场,模拟分析指出改进后热场加热功率降低,熔体温场改善,晶体﹑熔体轴向的温度梯度均升高,拉晶速率提升。通过单晶生长实验,验证了热场功率的降低和等径拉速的提高,改善在等径生长的后期更为明显。

This paper improves the thermal field in CG6000-type Czochralski crystal furnace, adding the bottom insulation carbon felt and the top insulation cover, changing the one section guide shell to the three sections guide shell. According to Growth simulation by CGsim simulation software, the previous thermal field is compared to the improved thermal field. Simulation analysis indicates heating power is reduced, the melt temperature field is improved, melt＇s axial temperature gradient and crystal＇s axial temperature gradient are increased, and pulling rate is increased. The single crystal growth experiment verified the thermal field power reduction and pulling rate increasing, and these improvements is more effective in the late diameter growth.