@article{oai:nagoya.repo.nii.ac.jp:00026441,
 author = {Kurimoto, Muneaki and Ozaki, Hiroya and Sawada, Tooru and Kato, Takeyoshi and Funabashi, Toshihisa and Suzuoki, Yasuo},
 issue = {3},
 journal = {IEEE Transactions on Dielectrics and Electrical Insulation},
 month = {Jul},
 note = {The feasibility of a permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a permittivity-graded epoxy insulator. The application of an appropriate gradient of the permittivity distribution to a permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.},
 pages = {1112--1120},
 title = {Filling ratio control of TiO2 and SiO2 in epoxy composites for permittivity-graded insulator with low coefficient of thermal expansion},
 volume = {25},
 year = {2018}
}