2013 Volume 133 Issue 3 Pages 111-115
This paper presents an attempt to derive the dc dielectric breakdown characteristic of epoxy composite containing alumina particles with mesoporous structure (Mesoporous-alumina/epoxy composite). By compounding epoxy resin and mesoporous-alumina particles which had the micrometric particle-diameter and the nanometric pore-size, mesoporous-alumina/epoxy composite was fabricated. The measurement of the specific gravity of mesoporous-alumina/epoxy composites revealed that the porosity of mesoporous-alumina particle even in the epoxy matrix was higher than that of nonporous-alumina particle. Furthermore, the measurement of the dielectric permittivity of the mesoporous-alumina/epoxy composites verified the existence of pore inside the mesoporous-alumina particle from the view point of electrical characteristics. From the breakdown test with using Mckeown electrode system, DC breakdown strength of mesoporous-alumina/epoxy composites was obtained, which was compared with that of the nonporous-alumina/epoxy composites. These results suggested that the nanometric pore with wormhole structure inside mesoporous particle could not be the critical defect for DC dielectric breakdown characteristic.
The transactions of the Institute of Electrical Engineers of Japan.A
The Journal of the Institute of Electrical Engineers of Japan