拉晶

因此，本文采用改进的贝叶斯概率加权多模型预测控制策略控制整个拉晶过程的热场温度。

So this paper proposed using improved Bayesian probability weighted multi-model predictive control algorithm to control the thermal field temperature of all crystal pulling process .

本文介绍采用密闭热系统拉晶工艺拉制硅单晶的情况。

The drawing of single crystal silicon in a closed thermal system is described .

拉晶速率对单晶高温合金高温持久断裂行为的影响

^ Effect Of Withdrawal Rate on High Temperature StressRupture Behaviour of Single Crystal Ni-Base Superalloy

生长速率可能大于拉晶速率，甚至某一时刻是负值。

The growth rate can exceed the pull rate and even be negative at a given time .

研究了不同拉晶速率下制得的镍基单晶高温合金的高温持久变形行为。

High temperature stress rupture behaviour of single crystal Ni-base superalloy prepared by different withdrawal rate has been studied .

由于拉晶过程中投料量较大，炉体结构复杂、造价昂贵，所以计算机数值模拟对于优化单晶炉设计是一种重要的工具。

Because of the large stuff of silicon , complex structure of furnace and expensive cost , computer simulation is a best way to optimize design .

合理的轴向温度梯度和径向温度梯度、低拉速、低晶转及规范的拉晶工艺是拉制大直径单晶的关键。

It indicates that appropriate temperature gradient ( both axial and radial ), lower pulling rate and lower seed rotation rate are cruxes of Φ 200 mm silicon single crystal growth .

对于晶体生长的研究需要进行大量的拉晶试验，由于长晶试验的费用非常昂贵，并且数值模拟可以获得实验中无法得到而对研究又十分重要的信息数据。

Lots of experiment is needed in the research of crystal growth , but the cost of that is very expensive , other . the numerical simulation can get the important data which cannot receive base on the experiment .