Title :
High-humidity deterioration and internal structure change of epoxy resin for electrical insulation
Author :
Kumazawa, T. ; Oishi, M. ; Todoki, M.
Author_Institution :
Electr. Power R&D Center, Chubu Electric Power Co. Inc., Nagoya, Japan
fDate :
2/1/1994 12:00:00 AM
Abstract :
Mechanical and electrical properties of filled epoxy were evaluated by accelerated aging under high humidity and high temperature. Significant changes in these properties arose from the slight water absorption. The presence of internal and irreversible flaws such as microscopic damage probably associated with the elastic inhomogeneities were predicted by scanning laser acoustic microscope attenuation, and surface structure changes were found by mercury porosimetry during the accelerated aging. It is considered that such internal and/or surface flaws play an important role of the changes in various properties due to water absorption
Keywords :
ageing; electric strength; environmental degradation; filled polymers; humidity; mechanical strength; moisture; organic insulating materials; surface structure; Hg porosimetry; accelerated aging; elastic inhomogeneities; electrical insulation; electrical properties; epoxy resin; filled epoxy; high temperature; high-humidity deterioration; internal flaws; internal structure change; mechanical properties; microscopic damage; scanning laser acoustic microscope attenuation; surface flaws; surface structure changes; water absorption; Absorption; Accelerated aging; Humidity; Laser transitions; Mechanical factors; Microscopy; Optical attenuators; Temperature; Underwater acoustics; Water;
Journal_Title :
Dielectrics and Electrical Insulation, IEEE Transactions on
