Investigation on Thermionic Emission Characteristics of Pressed Sc<sub>2</sub>O<sub>3</sub> Doped Y-Gd-Hf-O Directly-heated Cathode

WANG Xingqi; WANG Xiaoxia; LUO Jirun; QI Shikai; LI Yun

doi:10.11999/JEIT210111

Volume 44 Issue 4

Apr. 2022

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Article Navigation > Journal of Electronics & Information Technology > 2022 > 44(4): 1382-1387

WANG Xingqi, WANG Xiaoxia, LUO Jirun, QI Shikai, LI Yun. Investigation on Thermionic Emission Characteristics of Pressed Sc2O3 Doped Y-Gd-Hf-O Directly-heated Cathode[J]. Journal of Electronics & Information Technology, 2022, 44(4): 1382-1387. doi: 10.11999/JEIT210111

Citation:

WANG Xingqi, WANG Xiaoxia, LUO Jirun, QI Shikai, LI Yun. Investigation on Thermionic Emission Characteristics of Pressed Sc₂O₃ Doped Y-Gd-Hf-O Directly-heated Cathode[J]. Journal of Electronics & Information Technology, 2022, 44(4): 1382-1387. doi: 10.11999/JEIT210111

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Investigation on Thermionic Emission Characteristics of Pressed Sc₂O₃ Doped Y-Gd-Hf-O Directly-heated Cathode

doi: 10.11999/JEIT210111

WANG Xingqi^{1, 3
,
,},
WANG Xiaoxia¹,
LUO Jirun^{1, 3},
QI Shikai²,
LI Yun¹

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2.
School of Electronic Engineering, Jiujiang University, Jiujiang 332005, China
3.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds: The National Natural Science Foundation of China (61771454)

Received Date: 2021-02-01
Rev Recd Date: 2021-07-01

Available Online: 2021-08-24

Publish Date: 2022-04-18

Abstract

Abstract

To improve the Y-Gd-Hf-O cathodes anti-electron bombardment ability, a scandia doped cathode is prepared by a pressing technique combined with sintering in hydrogen atmosphere. The tested result shows that the emitting current from the cathode operating at 1550 °C can remain to 87.5% of the initial one after continuous electron bombardment of 10 W for 480 h, reflecting a better anti-electron bombardment capability. The surface microstructure analysis result indicates that a cermet structure has been formed. A n-type semiconductor Y₂O_3-_x layer has generated on the cathode surface after being sintered and activated at high temperature, which is favorable for enhancing the thermionic emission, improving the surface conductivity, and lowering the work function.
- Cathode thermionic emission,
- Magnetron,
- Work function,
- Anti-bombing

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References(16)

References

[1]	ZHANG Xiaoke, HUA Yazhou, WANG Jinshu, et al. Studies of the influence of ZrH₂ addition to the impregnant on the performance of yttrium oxide–tungsten matrix Ba dispenser cathodes[J]. IEEE Transactions on Electron Devices, 2021, 68(2): 829–834. doi: 10.1109/TED.2020.3045385
[2]	WANG Xiaoxia, WANG Xingqi, ZHAO Qinglan, et al. Research progress in new types of thermionic cathodes[C]. 13th IVESC, Bad Honnef, Germany, 2020: 18.
[3]	ROQUAIS J M and WIERSCHKE D J. Oxide cathode for electron gun with a differentially doped metallic substrate[P]. USA Patent, 522115, 2006.
[4]	GALLAGHER H E and KNAUER W. Thermionic emission cathode having reduced frontal area and enlarged emission area for ion bombardment environment[P]. USA Patent, 3439210DA, 1969.
[5]	KIRKWOOD D M, GROSS S J, BALK T J, et al. Frontiers in thermionic cathode research[J]. IEEE Transactions on Electron Devices, 2018, 65(6): 2061–2071. doi: 10.1109/TED.2018.2804484
[6]	毕建明. W-Y₂O₃金属陶瓷阴极的二次发射[J]. 电子与信息学报, 1982, 4(2): 132–136. BI Jianming. Some secondary emission properties of W-Y₂O₃ cermet cathode[J]. Journal of Electronics &Information Technology, 1982, 4(2): 132–136.
[7]	朱程, 杨金生, 李会成, 等. 30 kW连续波磁控管的研制[J]. 真空电子技术, 2013(5): 110–111. doi: 10.3969/j.issn.1002-8935.2013.05.030 ZHU Cheng, YANG Jinsheng, LI Huicheng, et al. Development of 30 kW continuous wave magnetron[J]. Vacuum Electronics, 2013(5): 110–111. doi: 10.3969/j.issn.1002-8935.2013.05.030
[8]	孙陵斌. 2 kW连续波磁控管阴极寿命的研究[J]. 真空电子技术, 2020(2): 51–53. doi: 10.16540/j.cnki.cn11-2485/tn.2020.02.12 SUN Lingbin. Study on cathode lifetime of a 2 kW continuous wave magnetron[J]. Vacuum Electronics, 2020(2): 51–53. doi: 10.16540/j.cnki.cn11-2485/tn.2020.02.12
[9]	WANG Jinshu, ZHOU Meiling, MA Shuyun, et al. A study on the anti-electron-bombing life of La₂O₃–Y₂O₃–Mo cermet cathode materials[J]. Journal of Alloys and Compounds, 2006, 419(1/2): 172–175. doi: 10.1016/j.jallcom.2005.06.086
[10]	漆世锴, 王小霞, 罗积润, 等. Y₂O₃-Gd₂O₃-HfO₂掺杂W基直热式阴极的热发射及耐电子轰击特性[J]. 稀有金属材料与工程, 2018, 47(12): 3784–3788. QI Shikai, WANG Xiaoxia, LUO Jirun, et al. Thermionic emission and anti-electron-bombing characteristics of the Y₂O₃-Gd₂O₃-HfO₂ doped W base direct-heated cathode[J]. Rare Metal Materials and Engineering, 2018, 47(12): 3784–3788.
[11]	蒋鹏宇, 王小霞, 罗积润, 等. Y₂O₃-Gd₂O₃-HfO₂浸渍W基直热式阴极次级电子发射的测试[J]. 微波学报, 2017, 33(S1): 250–253. JIANG Pengyu, WANG Xiaoxia, LUO Jirun, et al. Secondary electron emission of Y₂O₃-Gd₂O₃-HfO₂ impregnated W base directly-heated cathode[J]. Journal of Microwaves, 2017, 33(S1): 250–253.
[12]	陈晓倩, 王小霞, 张兆传, 等. Sc₂O₃掺杂对Y₂O₃-Gd₂O₃-HfO₂难熔稀土氧化物直热式阴极热发射性能的影响[J]. 真空科学与技术学报, 2019, 39(2): 131–135. doi: 10.13922/j.cnki.cjovst.2019.02.07 CHEN Xiaoqian, WANG Xiaoxia, ZHANG Zhaochuan, et al. Effect of Sc₂O₃-doping on thermal emission properties of Y₂O₃-Gd₂O₃-HfO₂ thermal cathode[J]. Chinese Journal of Vacuum Science and Technology, 2019, 39(2): 131–135. doi: 10.13922/j.cnki.cjovst.2019.02.07
[13]	郭艳群, 聂祚仁, 席晓丽, 等. 钨热电子发射材料的研究进展[J]. 稀有金属, 2005, 29(2): 200–205. doi: 10.3969/j.issn.0258-7076.2005.02.016 GUO Yanqun, NIE Zuoren, XI Xiaoli, et al. Advances in research on tungsten cathode materials[J]. Chinese Journal of Rare Metals, 2005, 29(2): 200–205. doi: 10.3969/j.issn.0258-7076.2005.02.016
[14]	漆世锴, 王小霞, 王兴起, 等. 大功率磁控管用新型Y₂Hf₂O₇陶瓷阴极研究[J]. 物理学报, 2020, 69(3): 037901. doi: 10.7498/aps.69.20191496 QI Shikai, WANG Xiaoxia, WANG Xingqi, et al. A novel Y₂Hf₂O₇ ceramic cathode applied to high power magnetron tube[J]. Acta Physica Sinica, 2020, 69(3): 037901. doi: 10.7498/aps.69.20191496
[15]	CUI Yuntao, WANG Jinshu, LIU Wei, et al. Effect of Scandia on tungsten oxide powder reduction process[J]. Journal of Rare Earths, 2010, 28(S1): 202–205. doi: 10.1016/S1002-0721(10)60274-8
[16]	赖陈, 王金淑, 周帆, 等. 新型钨铼混合基阴极的热电子发射性能[J]. 稀有金属材料与工程, 2016, 45(7): 1871–1875. LAI Chen, WANG Jinshu, ZHOU Fan, et al. Thermal electron emission properties of novel W-Re mixed matrix cathodes[J]. Rare Metal Materials and Engineering, 2016, 45(7): 1871–1875.