Title :
Hydration effects and surface conductivity of corona charged and gamma-irradiated insulating polymers and ceramics
Author :
Das-Gupta, D.K. ; Goodings, A.
Author_Institution :
Sch. of Electron. Eng., Univ. of Wales, Bangor, UK
Abstract :
The surface conductivity of aluminum oxide within the range of 0-80% RH (relative humidity) appears to be significantly higher than those of polyethylene and polyetherether ketone. Even at the highest hydration level (80% RH) the surface conductivity of the ceramic has been observed to be an order of magnitude less than that of bulk water. The decay behavior of corona-deposited surface charges on the ceramic and the polymers shows that the charge injection is not the dominant mechanism. An electronic conduction model provides a good agreement with the observed result of the surface current in hydrated polyethylene
Keywords :
alumina; ceramics; corona; electrical conductivity of amorphous semiconductors and insulators; electrical conductivity of crystalline semiconductors and insulators; gamma-ray effects; insulating materials; organic insulating materials; polymers; solvation; surface conductivity; Al2O3; alumina; ceramics; charge injection; corona charged materials; corona-deposited surface charges; decay behavior; electronic conduction model; gamma-irradiated materials; hydrated polyethylene; hydration effects; insulating polymers; polyetherether ketone; surface conductivity; Aluminum oxide; Ceramics; Charge measurement; Conductivity; Corona; Current measurement; Plastic insulation; Polyethylene; Polymers; Surface charging;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1991., Proceedings of the 3rd International Conference on
Conference_Location :
Tokyo
Print_ISBN :
0-87942-568-7
DOI :
10.1109/ICPADM.1991.172130
