An SEM flashover: technique to characterize wide band gap insulators

Sutjipto, Agus Geter Edy and Muhida, Riza and Takata, Masasuke (2006) An SEM flashover: technique to characterize wide band gap insulators. In: 8th International Conference on Properties and Applications of Dielectric Materials, 26 - 30 June 2006, Bali, Indonesia.

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Abstract

This paper introduces the use of a scanning electron microscope (SEM) to evaluate the insulation property of wide band gap insulators. An SEM may be used not only to observe a surface image but also to provide a fine electron beam for charging an uncoated insulator surface at once. The charging can create an electric field distribution in the surface. The increase of electric field at the surface may exceed a critical value when a surface breakdown/flashover occurs. An insulation property can be evaluated by varying the duration of charging/electron bombardment which is needed to initiate an optically-visible flashover treeing formation (hereinafter time to flashover treeing/TTF). In this paper, high purity MgO as a wide band gap insulator material was used as a main investigated sample. Varying addition of high purity SiO2 was used to change insulator property of the MgO. Under a certain SEM's energy and magnification, SiO2 addition has change the duration of charging up to surface breakdown. Therefore, this technique may be useful for investigating an insulation property of materials under electron bombardment such as MgO in a plasma display panel, high voltage insulator, and other insulator materials for space technology.

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	4703/9423
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK452 Electric apparatus and materials. Electric circuits. Electric networks
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Agus Geter Edy Sutjipto
Date Deposited:	04 Apr 2012 12:13
Last Modified:	04 Apr 2012 12:13
URI:	http://irep.iium.edu.my/id/eprint/9423

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