温度膨胀系数（Coefficient of the thermal expansion） 当材料的表面温度增加时，测量到的每度温度材料膨胀百万分率(ppm)
根据具有不同温度膨胀系数的材料遇热变形不同的原理，设计了该热控系统的关键部件-热开关。
Base on the theory of differential thermal expansion between the two materials having different CTE values, a thermal switch as a crucial part in the thermal control system is designed.
如果阀体的材料是可以焊接的，但膨胀系数差异很大，或者工作温度的变化幅度范围较大，螺纹连接部必须进行蜜封焊。
If the valve body material can be welded, but very different thermal expansion coefficient, or changes in operating temperature range of a larger thread junction closure weld must be honey.
由不胀钢制成非常低膨胀系数的样品载台保证温度变化对样品的位置没有影响。
A very low linear expansion coefficient sample carrier made from invar ensures that temperature change has no effect on the sample position.
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