NDLI: The correlation between surface chemical elements of solid insulating materials and their flashover characteristics in vacuum

Content Provider	IEEE Xplore Digital Library
Author	Guan-Jun Zhang Xue Wang Zhang Yan
Copyright Year	2002
Description	Author affiliation: Sch. of Electr. Eng., Xi'an Jiaotong Univ., China (Guan-Jun Zhang; Xue Wang; Zhang Yan)
Abstract	The X-ray photoelectron spectroscopy (XPS) technique was employed to analyze the surface chemical elements of alumina ceramic and polytetrafluoroethylene (PTFE) in a high vacuum, respectively. On the surface of alumina samples, there were Al, Si, C and O elements, and C with a maximum percentage of 57.78%. For PTFE samples, F, C, K and O elements were detected, and F showed a remarkable atomic ratio of 73.30%. Obviously, the surface chemical elements assignment disagreed with their chemical formula, respectively. We attributed the high percentage of F to quantities of F atoms existing on the surface of PTFE due to its molecular chain with C atoms surrounded by F atoms spirally. The chemical distortion on a solid surface would result in the alteration of surface electron structure and subsequently the adjustment of surface energy distribution. Thus, the solid surface serves as a weak part in a compound dielectric system, which results in the flashover phenomena occurring across the surface/interface region at a low applied electric field.
Sponsorship	Region Centre Ville de Tours Conseil General D'Indre et Loire ABB IEEE SANDIA TOSHIBA
Starting Page	626
Ending Page	629
File Size	269587
Page Count	4
File Format	PDF
ISBN	0780373944
DOI	10.1109/ISDEIV.2002.1027452
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-07-01
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Chemical elements Solids Insulation Flashover Spectroscopy Chemical analysis Ceramics Vacuum technology Electrons Dielectrics
Content Type	Text
Resource Type	Article

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