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本文研究了Bridgman—Stockbarger法定向凝固的温度场。着重研究了有限长试样从下向上凝固时,固液界面上的温度梯度和生长速度的变化,装置的环境温度分布,试样轴向温度分布以及提高温度梯度的方法。实验发现,有限长试样的中间部分凝固时的工艺条件是稳定且可控的。在炉底部安装一个内径很小的加热圈是提高温度梯度最有效的方法。
In this paper, the temperature field of Bridgman-Stockbarger method for directional solidification is studied. Emphasis is placed on the change of temperature gradient and growth rate at the solid-liquid interface, the ambient temperature distribution of the device, the axial temperature distribution of the sample and the method of increasing the temperature gradient. The experimental results show that the process conditions for the solidification of the middle part of a finite length sample are stable and controllable. Installing a small inner diameter heater ring at the bottom of the furnace is the most effective way to increase the temperature gradient.