抄録
Preparation of oriented aluminum nitride bulk ceramics was achieved by slip casting in a high magnetic field of 10T followed by sintering. The interaction between anisotropic susceptibility and a magnetic field generate a magnetic torque and the torque rotate particles in a suspension. However, the magnetic susceptibility of aluminum nitride is too small, consequently it was difficult to develop a textured microstructure using a magnetic field. The dispersion of powders in a suspension was important when effectively applying a magnetic field to the powders in this processing technique. Colloidal processing using repulsive surface forces was used in this study to prevent heterogeneous agglomerates in a suspension. The c-axis of AlN was perpendicular to the direction of a magnetic field. The thermal conductivity on the direction parallel to a magnetic field in the oriented AlN was lager than that perpendicular to a magnetic field.
