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Y2O3-Gd2O3-HfO2摻雜W基直熱式陰極熱發(fā)射及耐電子轟擊特性研究
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1.中國科學(xué)院電子學(xué)研究所中國科學(xué)院高功率微波源與技術(shù)重點實驗室 北京;2.中國科學(xué)院大學(xué) 北京

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O462

基金項目:

國家重點基礎(chǔ)研究發(fā)展計劃(No.2013CB328901); 國家自然科學(xué)基金資助(項目號11305177)；


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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Project supported by the State Key Development Program for Basic Research of China (Grant No.2013CB328901), the National Natural Science Foundation of China (Grant No.11305177).

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    摘要:

    為了提高大功率磁控管陰極的耐電子轟擊性能，首次采用Y2O3-Gd2O3-HfO2(Y-Gd-Hf-O)摻雜金屬W粉制備大功率磁控管用直熱式陰極。對不同質(zhì)量百分比(wt%)Y-Gd-Hf-O摻雜W基直熱式陰極的熱發(fā)射及耐電子轟擊特性進(jìn)行了研究。實驗結(jié)果顯示，50 wt% Y-Gd-Hf-O摻雜W基直熱式陰極具有較大的熱發(fā)射能力，1500 ℃工作溫度下即可提供1.0 A/cm2的拐點發(fā)射電流密度。10 wt% Y-Gd-Hf-O摻雜W基直熱式陰極具有較好的耐電子轟擊性能，經(jīng)過14 W/cm2電子連續(xù)轟擊200 h后，熱發(fā)射電流密度僅下降0.1 A/cm2。最后，對Y-Gd-Hf-O摻雜W基直熱式陰極熱發(fā)射及耐電子轟擊機(jī)理進(jìn)行了有益的探討。

    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.

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漆世鍇,王小霞,羅積潤,胡明煒,李云. Y2O3-Gd2O3-HfO2摻雜W基直熱式陰極熱發(fā)射及耐電子轟擊特性研究[J].稀有金屬材料與工程,2018,47(12):3784~3788.[qishikai, wangxiaoxia, luojirun, humingwei, 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.]
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  • 收稿日期:2016-06-09
  • 最后修改日期:2016-10-23
  • 錄用日期:2016-11-11
  • 在線發(fā)布日期: 2019-01-04
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