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依据热力学原理计算了Ｗ－ＴｈＯ２阴极材料的蒸发速率，并分析了其蒸发规律．结果表明：随温度升高，各成分的蒸发速率按指数方式增大，其中ＴｈＯ２的蒸发速率最大，其次是Ｗ、Ｔｈ及ＷＯ２．在工作一定时间后，阴极表层会出现缺ＴｈＯ２区，Ｔｈ的蒸发受ＴｈＯ２还原反应的控制．通过与实验方法对比，认为采用热力学原理计算蒸发速率是一种简便可靠的方法．
Based on the principle of thermodynamics, the evaporation rate of W-ThO2 cathode material was calculated and its evaporation law was analyzed. The results show that with the increase of temperature, the evaporation rate of each component increases exponentially, of which ThO2 has the highest evaporation rate, followed by W, Th and WO2. After working for a certain period of time, there will be a lack of ThO2 on the surface of the cathode. The evaporation of Th is controlled by ThO2 reduction. By comparison with the experimental method, it is considered that the calculation of the evaporation rate by the thermodynamic principle is a simple and reliable method.