论文部分内容阅读
研制了一种大功率磁控管用W-Y合金阴极,并对该合金阴极的热发射、寿命等特性分别进行了测试。热发射测试结果显示,该合金阴极在1400℃工作温度时,其直流热发射特性曲线出现了较明显的空间电荷偏离点。而当阴极工作温度升高为1500℃、1600℃时,该阴极的直流热发射特性曲线一直呈直线上升,并未出现空间电荷偏离点,这与金属阴极的热发射特性曲线一般会出现空间电荷偏离点常识相违背。寿命测试结果显示,该合金阴极在1600℃工作温度下,经过80 h寿命测试后,热发射电流密度从初始的1.5直线下降至0.2 A/cm~2,能谱仪分析结果显示,此时W-Y合金阴极中Y元素从初始的46.45%下降至8.36%。最后,对该合金阴极热发射反常现象机理进行了有益的探讨。
A W-Y alloy cathode for high-power magnetron was developed, and the characteristics of heat-emitting and life-span of the cathode were tested respectively. The results of the thermal emission test show that the DC thermal emission characteristic curve of the alloy cathode shows a significant point of space charge deviation at the operating temperature of 1400 ° C. However, when the working temperature of the cathode is increased to 1500 ℃ and 1600 ℃, the direct current heat emission characteristic curve of the cathode rises linearly without any space charge deviating point, which is generally associated with the space charge Deviation from common sense point of departure. Lifetime test results show that the cathode current density at 1600 ℃ operating temperature, after 80 h life test, the thermal emission current density from the initial 1.5 straight down to 0.2 A / cm ~ 2, EDS analysis showed that the WY The content of Y in the cathode decreased from 46.45% to 8.36%. Finally, the beneficial mechanism of the anomalous phenomenon of the cathode thermal emission of the alloy was discussed.