Effect of Slurry Temperature on Particle Orientation in Magnetic Field Assisted Forming Method

Abstract

The rate of particle orientation for a colloidal processing in magnetic field was examined experimentally by the temperature dependence of viscosity of slurry. Slurry consisting （Sr, Ca）₂NaNb₅O₁₅ particles and photopolimarization resin was used and consolidated by UV irradiation reaction after various duration times in the strong magnetic field. The degree of orientation of a sample increased with the duration time. Viscosity of the slurry decreased remarkably with an increasing in temperature from 20℃ to 50℃. The reduction of the viscosity of slurry contributed to make the hydrodynamic torque small, and the duration time in the magnetic field become short. In a magnetic field at 6 T, the time for sufficient orientation was achieved within 10 seconds in spite of using condensed slurry with 45 vol％. The result will contribute to spread this fabrication process.