Tape casting of cobalt ferrite from nonaqueous slurry

This paper describes the fabrication of CoFe 2 O 4 thick films using the tape casting method from nonaqueous slurry. CoFe 2 O 4 particles with average size of ∼800   nm were prepared by the solid-state reaction method. Sediment volumes and viscosity were tested to study the effects of dispersant in reducing aggregations in slurry. Slurry with 0.25   wt% dispersant amounts and 41.3   wt% solid content showed the optimal stability and rheological properties. A tape velocity of 8   cm/s was used in this study considering the non-Newtonian flow behavior at low shear rate. CoFe 2 O 4 ceramic films sintered at 1150   °C for 2   h have dense structure (relative density of 94%) and exhibited ferromagnetic properties with in-plane saturation magnetization of ∼324   emu/cm 3 .