| 摘要 |
PURPOSE:To obtain carbon fine powder for electroviscous fluid having high resistance and fine particle appearance and capable of providing excellent viscosity responsiveness to applied voltage and long-term stability by lowering initial viscosity in dispersing to a dispersing phase and to provide effective method for producing the fine powder. CONSTITUTION:This carbon fine powder for electroviscous fluid consists of amorphous shoot-like carbon fine powder containing carbon cluster and has 10-10<8>OMEGAcm electric specific resistance and 1-5wt.% of oxygen content. In the carbon fine powder, specific surface area of nitrogen absorption is preferably >=50m<2>/g. This method for producing the carbon fine powder comprises heating and vaporizing a carbon material in a system retained under 20-500Torr pressure by an inert atmosphere containing 1-20vol% oxygen and rapidly cooling and re-solidifying the vaporized carbon vapor. |
