Surface flashover characteristics of modified polyimide under DC voltage in vacuum

被引：0

作者：

State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an 710049, China ^{[1
]}

不详 ^{[2
]}

机构：

[1] State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University

[2] Shanghai Key Laboratory of Spacecraft Mechanism

来源：

Hsi An Chiao Tung Ta Hsueh | 2013年 / 4卷 / 51-56期

关键词：

Electron-stimulated desorption; Gas desorption; Nano modified; Polyimide; Surface flashover; Surface state;

D O I：

10.7652/xjtuxb201304010

中图分类号：

学科分类号：

摘要：

Direct current (DC) surface flashover characteristics of modification technology on polyimide (PI) in vacuum are investigated accompanied with the theoretical analysis. Two kinds of semi-conductive powders (nano scale and micro scale) are chosen as the modifier of raw PI, and the experiments for DC surface flashover characteristics of PI material in vacuum (10-3 Pa) are carried out. Meanwhile, the surface flashover mechanism under DC voltage in high vacuum is analyzed following the test results of secondary electron emission (SEE) coefficient and the observed surfaces state of flashover experimented samples by scanning electron microscopy (SEM). The experimental results show (1) In vacuum, DC surface flashover voltage of nano modified PI which used nonlinear conductivity filler is higher than pure PI, while that of micro modified PI is lower than pure PI; (2) The surface SEE coefficient of nano modified is reduced and the roughness of surface is increased; (3) Gas overflow phenomenon appears in the moment of prebreakdown. In combination with the results of SEM and physical analysis, it is considered that the nano modified composite sample has a lower electron-stimulated desorption coefficient, thus leading to gas desorption, is the key factor affecting DC surface flashover voltage in vacuum.

引用

页码：51 / 56

页数：5

共 23 条

[1] Wang K., Xiao F., Zhan M., Preparation and atomic oxygen resistance of polyimide/inorganic oxide composite films, Journal of Beijing University of Aeronautics and Astronautics, 38, 5, pp. 601-604, (2012)
[2] Zha J., Dang Z., Insulation properties of polyimide/nano-ZnO hybrid films with good corona resistance, Proceedings of the CSEE, 29, 34, pp. 122-127, (2009)
[3] Okumura T., Nitta K., Takahashi M., Flashover plasma characteristics on 5 m<sup>2</sup> solar array panels in a simulated plasma environment of geostationary orbit and low earth orbit, 48th AIAA Aerospace Sciences Meeting, (2010)
[4] Anderson R.A., Brainard J.P., Mechanism of pulsed surface flashover involving electron-stimulated desorption, J Appl Phys, 51, 3, pp. 1414-1421, (1980)
[5] Panitz J.A., Preflashover phenomena and electron-stimulated desorption in high electric fields, J Appl Phys, 45, 3, pp. 1112-1114, (1974)
[6] Gray E.W., Vacuum surface flashover: A high-pressure phenomenon, J Appl Phys, 58, 1, pp. 132-141, (1985)
[7] Neuber A.A., Butcher M., Krompholz H., Et al., The role of outgassing in surface flashover under vacuum, IEEE Transactions on Plasma Science, 28, 5, pp. 1593-1598, (2000)
[8] Blaise G., Legressus C., Charging and flashover induced by surface polarization relaxation process, J Appl Phys, 69, 9, pp. 6334-6339, (1991)
[9] Blaise G., New approach to flashover in dielectrics based on a polarization energy relaxation mechanism, IEEE Transactions on Electrical Insulation, 28, 4, pp. 437-443, (1993)
[10] Ren C., Yuan W., Zhang D., Et al., New development of microstack insulator technology, IEEE Transactions on Dielectrics and Electrical Insulation, 18, 4, pp. 1017-1021, (2011)

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