Influence of Surface Carburization of Machinable Ceramics on Its Pulsed Flashover Characteristics in Vacuum

ZHENG Nan; HUANG Xuezeng; MU Haibao; ZHANG Guanjun

Plasma Science and Technology > 2011 > 13(6): 656-660.

ZHENG Nan, HUANG Xuezeng, MU Haibao, ZHANG Guanjun. Influence of Surface Carburization of Machinable Ceramics on Its Pulsed Flashover Characteristics in Vacuum[J]. Plasma Science and Technology, 2011, 13(6): 656-660.

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Influence of Surface Carburization of Machinable Ceramics on Its Pulsed Flashover Characteristics in Vacuum

State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi 'an 710049, China

Funds: supported in part by the National Natural Science Foundation of China (Nos. 50937004, 50777051) and by NSFC-JSPS Joint Project (50911140103).

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Received Date: July 19, 2011

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Abstract

Abstract

For pulsed power devices, surface flashover phenomena across solid insulators greatly restrict their overall performance. In recent decades, much attention has been paid on enhancing the surface electric withstanding strength of insulators, and it is found that surface treatment of material is useful to improve the surface flashover voltage. The carburization treatment is employed to modify the surface components of newly-developed machinable ceramics (MC) materials. A series of MC samples with different glucose solution concentration (0%, 10%, 20%, 30% and 40%) are prepared by chemical reactions for surface carburization modification, and their surface flashover characteristics are investigated under pulsed voltage in vacuum. It is found that the surface carburization treatment greatly modifies the surface resistivity of MCs and hence the flashover behaviors. Based on the reduction of surface resistivity and the secondary electron emission avalanche (SEEA) theory, the adjustment of flashover withstanding ability can be reasonably explained.
- Machinable ceramics,
- vacuum,
- surface carburization,
- secondary electron emission,
- flashover

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