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Modification of copper surface by runaway electrons preionized diffuse discharges at atmospheric pressure

Published online by Cambridge University Press:  11 February 2016

Cheng Zhang ,
Mikhail V. Erofeev ,
Zhi Fang ,
Mikhail A. Shulepov ,
Zhongsheng Zhou ,
Victor F. Tarasenko  and
Tao Shao
Cheng Zhang
Affiliation:
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Mikhail V. Erofeev
Affiliation:
Institute of High Current Electronics, Russian Academy of Sciences, Tomsk 634055, Russia National Research Tomsk Polytechnic University, Tomsk 634050, Russia
Zhi Fang
Affiliation:
School of Automation and Electrical Engineering, Nanjing University of Technology, Nanjing, Jiang Su 210009, China
Mikhail A. Shulepov
Affiliation:
Institute of High Current Electronics, Russian Academy of Sciences, Tomsk 634055, Russia
Zhongsheng Zhou
Affiliation:
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China School of Automation and Electrical Engineering, Nanjing University of Technology, Nanjing, Jiang Su 210009, China
Victor F. Tarasenko
Affiliation:
Institute of High Current Electronics, Russian Academy of Sciences, Tomsk 634055, Russia National Research Tomsk Polytechnic University, Tomsk 634050, Russia
Tao Shao*
Affiliation:
Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
*
Address correspondence and reprint requests to: Tao Shao, Institute of Electrical Engineering, Chinese Academy of Sciences, PO Box 2703, 100190 Beijing, China. E-mail: [email protected]
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Abstract

Runaway electrons preionized diffuse discharge (REP DD) could generate volume non-thermal plasmas at atmospheric pressure, thus is widely used for surface modification. In this paper, two pulsed generators are used to produce REP DD for modifying copper (Cu) foil in atmospheric air. One generator produces repetitive pulses with a peak voltage of 40 kV and a rise time of 150 ns. The other generator produces single pulse with a peak voltage of 280 kV and a rise time of 0.5 ns. After the treatment, the modification results for including the macro topography, chemical composition and microhardness in different depths of the Cu surface are analyzed. In order to estimate the modification results in different areas of the Cu foil, several points from the center to the edge of the Cu sample are selected. It could be observed that the maximal modification effect usually appears in the area where the density of the diffuse discharge plasma is highest. The experimental results show REP DD treatment could significantly decrease the water contact angle and increase surface energy of the Cu foil. Meanwhile, it could decrease the carbon concentration and increase oxygen concentration in the near-surface layer of the Cu sample, and enhance the microhardness in different depths of the Cu foil.

Keywords

Atmospheric pressurenanosecond pulse dischargeplasma treatmentrunaway electrons preionized diffuse dischargesurface microhardness enhancementsurface modification of copper
Type
Research Article
Information
Laser and Particle Beams , Volume 34 , Issue 2 , June 2016 , pp. 202 - 209
Copyright
Copyright © Cambridge University Press 2016 

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