| 摘要 |
PURPOSE:To provide the subject powder having long-term stability and temperature stability by dispersing dielectric material fine particles comprising carbonaceous powder in an electrically insulating oily medium, the carbonaceous powder being prepared by allowing carbon to grow on inorganic fine particles as generation nuclei. CONSTITUTION:Dielectric material fine particles comprising carbonaceous powder preferably having a particle diameter of 0.5-5mu and prepared by allowing carbon to grow on generation nuclei comprising the inorganic fine particles of silica, alumina, rutile, aluminum silicate, etc., having an average particle diameter of preferably 0.01-1mu are dispersed in an oily medium such as a spindle oil, a transformer oil, a chlorinated paraffin, a silicone, oil, etc., having a high electrically insulating property to provide the objective carbonaceous powder. |
