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polarity effects of Propylene Carbonate on Breakdown Strength in Microsecond Range

Chinese Journal of Chemical Physics 2015年第5期28卷 -页

作者： Zhen Wang Zi-cheng Zhang Jian-de Zhang College of Opto-electronic Science and Engineering National University of Defense Technology Changsha 410073 China

We investigate the polarity effects of the propylene carbonate on the breakdown voltage using the needle-plate electrodes with gaps of 0.5, 1.0, and 2.0 mm. The devices used in this study involve a compact capacitive-energy-storage pulse power source with charging time varying from 5 ms to 20 ms and a test cell with the needle-plate electrodes. The breakdown voltage is recorded by a digital oscilloscope for each gap. The results of these three groups indicate that the positive breakdown voltage is higher than the negative one and the breakdown voltage of the PC increases with the ascending electrode gap. In addition, a simulation is conducted to support this experiment. Some explanations about the polarity effect of the PC are also given.

关键词： Breakdown strength Propylene carbonate polarity effect

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An analytical model to predict diffusion induced intermetallic compounds growth in Cu-Sn-Cu sandwich structures

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Theoretical & Applied Mechanics Letters 2020年第1期10卷 33-37页

作者： Yuexing Wang Yao Yao Leon Keer Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA

A mass diffusion model is developed to describe the growth kinetics of Cu6Sn5 intermetallic compounds(IMC)in the Cu-Sn-Cu sandwich *** proposed model is based on the local interfacial mass conversation law where interfacial Cu/Sn reactions and atomic diffusion are *** analysis shows that the IMC thickness growth is proportional to the square root of the product of the diffusion coefficient and *** proposed model can explain the polarity effect of electromigration on kinetics of IMC growth where all the parameters have clear physical *** theoretical predictions are compared with experimental results and show reasonable accuracy.

关键词： Intermetallic compounds polarity effect Electromigration Diffusion Size effect

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Discharge along a contaminated dielectric surface

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Progress in Natural Science:Materials International 1995年第4期 13-22页

作者：张仁豫关志成薛家麒朱德恒谈克雄 Beijing 100084 China Department of Electric Engineering Tsinghua University

Discharge along a contaminated dielectric surface is a problem related with the safe operation of electric power transmission system, but it is still unclear theoretically and unsolved completely in practice now. In the beginning of this century, there were messages about the pollution flashover under service voltage on transmission lines. It

关键词： pollution flashover voltage recovery condition criterion of pollution flashover polarity effect low atmospheric pressure.

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