| 摘要: |
| 分析了当前小功率电推进器对零流动无推进剂阴极的需求现状。提出铁电阴极用于小功率电推进中和器的可行性。研究了厚度为0.5 mm的锆钛镧酸铅(PLZT)铁电陶瓷在低激励电压(1.0～1.2 kV)下的电子发射特性。采用单极性正高压脉冲和80 Hz重复脉冲作为激励源,在收集极获得了脉宽为320～3000 ns,最高峰值分别为34 A和27 A的发射电流。在10-5Torr的真空环境中得到了可靠的电子发射。 |
| 关键词: 电推进 中和器 铁电阴极 电子发射 |
| DOI： |
| 分类号:V439.2 |
| 基金项目:国家“九七三”项目(2002CB613307) |
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| A study of ferroelectric cathodes for neutralizer |
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SHENG Zhao-xuan1,2, SUN Xin-li1, FENG Yu-jun2, XU Zhuo2
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1.Dept.of Engineering Physics,The Second Artillery Engineering Coll.,Xi’an 710025,China;2.Electronic Materials Research Laboratory,Xi’an Jiaotong Univ.,Xi’an 710049,China
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| Abstract: |
| Low-or no-flow electron emitters required for low power electric thrusters have been analyzed.Feasibility of ferroelectric cathode used for neutralizer is proposed.The lead lanthanum zirconate titanate(PLZT) used in experiments is 0.5 mm thick.Electron emission property of lead lanthanum zirconate titanate under low driving voltage(1.0~1.2 kV) has been studied.Ferroelectric cathodes are driven by unipolar positive pulse and repetition pulse 1 μs in duration.Emission current 320~3 000 ns in duration with peak current up to 34 A and 27 A have been acquired,respectively.Reliable emission has been achieved in air background at pressures as high as 10-5 Torr. |
| Key words: Electric propulsion Neutralizer Ferroelectric cathode Electron emission |
