Title :
Study on radiation aging of polymeric insulating material by positron annihilation
Author :
Fujita, S. ; Baba, M. ; Noto, F. ; Suzuki, T. ; Kitahara, H.
Author_Institution :
Dept. of Electr. Eng., Hachinohe Inst. of Technol., Hachinohe-shi, Japan
Abstract :
Structure changes of fluoropolymer, a heat-resistant insulating material, after γ-ray irradiation, were investigated using positron annihilation. The correlation between structure changes and dielectric breakdown strength was studied. The dielectric breakdown strength is found to decrease with increasing dose. Positron lifetime data showed that crystallinity increased with irradiation. As the crystalline region is increased by irradiation, it is easy to accelerate electrons when impulse voltage is applied. It is then that dielectric breakdown occurs
Keywords :
ageing; electric breakdown; gamma-ray effects; insulation testing; life testing; polymer insulators; polymer structure; polymers; positron annihilation; γ-ray irradiation; dielectric breakdown strength; fluoropolymer; heat-resistant insulating material; polymeric insulating material; positron annihilation; radiation aging; structure changes; Acceleration; Aging; Crystalline materials; Crystallization; Dielectric breakdown; Dielectric materials; Dielectrics and electrical insulation; Plastic insulation; Polymers; Positrons;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1993. Annual Report., Conference on
Conference_Location :
Pocono Manor, PA
Print_ISBN :
0-7803-0966-9
DOI :
10.1109/CEIDP.1993.378914
