| 摘要 |
PURPOSE:To provide the fluid capable of obtaining a remarkably large induction shear stress, large in the width in the change of viscosity, and not causing the change of the ordinary temperature performance even under high temperature environments by dispersing specific polarizable particles in an electrically insulating medium. CONSTITUTION:Polarizable fine particles (preferably silica, barium titanate) carrying the fine particles of a metal salt (e.g. nickel chloride, aluminum chloride) on their surfaces are dispersed in an electrically insulating medium (preferably a silicone oil) to provide the objective fluid. The fluid is obtained e.g. by adding dried gamma-alumina fine powder to a nickel chloride aqueous solution obtained by dissolving nickel chloride hexahydrate in distilled water, stirring the mixture, filtering the mixture, drying the obtained solid material, calcining the dried product, and dispersing the obtained powder in a dried silicone. |
