TiO_(2)/鳞片石墨复合大面积阴极爆炸电子发射性能初步实验研究  

Preliminary Experimental Study on Performance of TiO_(2)/Flake Graphite Composite Cathode for Large Area Explosion Emission

作　　者：石俊 胡继军 杨柳 付浩[3] 蔡杰 陈庭旭 李天明 SHI Jun;HU Jijun;YANG Liu;FU Hao;CAI Jie;CHEN Tingxu;LI Tianming(Beijing Institute of Telemetry Technology,Beijing 100076,China;School of Electronic Science and Engineering,University of Electronic Science and Technology;School of Physics,University of Electronic Science and Technology:Chengdu 610054,China)

机构地区：[1]北京遥测技术研究所,北京100076 [2]电子科技大学电子科学与工程学院 [3]电子科技大学物理学院,成都610054

出　　处：《现代应用物理》2023年第3期129-134,共6页Modern Applied Physics

基　　金：航天科技集团应用创新计划资助项目(6230108001)。

摘　　要：以鳞片石墨为基底材料,利用固相混合的方式制备了TiO_(2)质量分数ω(TiO_(2))分别为15%,20%,35%,50%,75%的TiO_(2)/鳞片石墨复合阴极,并使用同轴二极管进行热测试。实验结果表明,与纯石墨阴极相比,ω(TiO_(2))为20%,35%,50%的复合阴极的发射延时降低,其中,ω(TiO_(2))为35%的复合阴极发射延时降低大于1 ns。使用非相对论同轴二极管空间电荷限制流方程对等离子体径向漂移速度进行近似计算。计算结果表明:在发射初期,复合阴极等离子体径向漂移速度远大于纯石墨阴极;在电压持续阶段的30~60 ns,复合阴极的等离子体径向漂移速度均小于纯石墨阴极,其中,与纯石墨阴极相比,ω(TiO_(2))为20%,75%复合阴极的等离子体径向漂移速度降低大于30%;在整个电压持续阶段,ω(TiO_(2))为20%复合阴极的等离子体径向漂移速度降低大于20%。TiO_(2)/graphite composite cathodes with different doping mass fraction of 15%,20%,35%,50%,75%are prepared by using flake graphite as the substrate material through solid-state mixing,and thermal testing is conducted using coaxial diodes.The experimental results show that the emission delay of composite cathodes with a mass fraction of 20%,35%,and 50%is lower than that of graphite cathodes,among which the emission delay of composite cathodes with a mass fraction of 35%is reduced by more than 1 ns.The non relativistic coaxial diode space charge limited current equation is used to approximate the plasma drift velocity.The results show that the plasma drift velocity of the composite cathode is much higher than that of the pure graphite cathode at the initial stage of emission.The plasma drift velocity of the composite cathode is lower than that of the graphite cathode in the voltage duration of 30 ns to 60 ns,and the sample with a mass fraction of 20%,75%are more than 30%lower than that of the graphite cathode.

关 键 词：石墨复合阴极 阴极制备 爆炸发射阴极 发射延时 等离子体漂移速度 

分 类 号：TM15[电气工程—电工理论与新技术] O441[理学—电磁学]