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漆世锴,王小霞,罗积润,胡明炜,李云.Y2O3-Gd2O3-HfO2掺杂W基直热式阴极热发射及耐电子轰击特性研究[J].稀有金属材料与工程(英文),2018,47(12):3784~3788.[qishikai,wangxiaoxia,luojirun,humingwei and liyun.A study on the thermionic emission and anti-electron-bombing characteristics of the Y2O3-Gd2O3-HfO2 doping W base direct-heated cathode[J].Rare Metal Materials and Engineering,2018,47(12):3784~3788.]
A study on the thermionic emission and anti-electron-bombing characteristics of the Y2O3-Gd2O3-HfO2 doping W base direct-heated cathode
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Received:June 09, 2016  Revised:October 23, 2016
DOI:
Key words: Directly-heated cathode  Magnetron  thermionic emission  anti-electron-bombing  emission mechanism
Foundation item:国家重点基础研究发展计划(No.2013CB328901); 国家自然科学基金资助(项目号11305177);
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qishikai,wangxiaoxia,luojirun,humingwei and liyun  
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Abstract:
      In order to improve the anti-electron-bombing performance of the cathode applied in high-power magnetron tube. A method of Y2O3-Gd2O3-HfO2(Y-Gd-Hf-O) doping metallic W powders was used to prepare direct-heated cathode. The thermionic emission and anti-electron-bombing characteristics of different mass percent Y-Gd-Hf-O doping cathode were researched. Experimental results show that the 50 wt% Y-Gd-Hf-O doping cathode has large thermionic emission, which can provide 1.0 A/cm2 knee-point emitted current at 1500 ℃. The 10 wt% Y-Gd-Hf-O doping cathode has good anti-electron-bombing capability, whose thermionic emission current density has merely fell by 0.1 A/cm2 after 200 h continuous 14 W/cm2 electron bombing. At last, the thermionic emission and anti-electron-bombing mechanisms of the Y-Gd-Hf-O doping cathode were discussed reasonably.