(1- x )CaTiO 3 - x Ni 0.5 Zn 0.5 Fe 2 O 4 (0 ≤ x ≤ 1.0) composite ceramics were synthesized by a conventional solid state reaction method. The phase formation, microstructure, and dielectric and magnetic properties were investigated by X-ray diffraction, scanning electron microscopy, precision impedance analysis, and vibrating sample magnetometry, respectively. The results indicate that the composite ceramics are composed of both perovskite phase CaTiO 3 and spinel phase Ni 0.5 Zn 0.5 Fe 2 O 4 . The maximal relative density for 0.5CaTiO 3 -0.5Ni 0.5 Zn 0.5 Fe 2 O 4 composite ceramics reaches 97.8%, as it has been sintered at the temperature of 1260 °C for 3 h. Dielectric constant and loss tangent of (1- x )CaTiO 3 - x Ni 0.5 Zn 0.5 Fe 2 O 4 composite ceramics show dispersion in the low frequency range. Their phase transition temperature of the dielectric constant shifts to lower temperatures with the increase of Ni 0.5 Zn 0.5 Fe 2 O 4 content. This phenomenon is attributed to that the phase transition temperature of CaTiO 3 is higher than that of Ni 0.5 Zn 0.5 Fe 2 O 4 . The saturation magnetization of (1- x )CaTiO 3 - x Ni 0.5 Zn 0.5 Fe 2 O 4 composite ceramics increases with the Ni 0.5 Zn 0.5 Fe 2 O 4 ferrite content.
It is the rheology behavior of suspension that is the key of the gel-casting. Concentrated zirconia suspension and low viscosity are needed to prepare zirconia suspension. The effects of p H value,dispersant,solid loading,the mass fraction of AM and the ratio of MBAM to AM on the rheology behavior of suspension were discussed in detail. The results show,when p H value is about 10 and the mass fraction of dispersant is 0. 3wt%,the mass fraction of AM is 1. 0wt%,the ratio of MBAM to AM is 20∶1,the dispersive effect is the best and the viscosity is 2. 12 Pa·s.
采用固相反应法合成了（1-x）CaTiO3/xNi0.5Zn0.5Fe2O4（0≤x≤1.0）复合材料,并研究了复合材料的物相、微观结构、介电性能和磁性能。结果表明:样品中仅含有钙钛矿型CaTiO3和尖晶石型Ni0.5Zn0.5Fe2O4。1260℃保温3h,样品相对密度达到98.91%,颗粒尺寸约为2μm。样品介电常数随Ni0.5Zn0.5Fe2O4含量（x）增加而增大。当x=0.7、测试频率为103 Hz时,样品介电常数（εr）和介电损耗（tanδ）分别为2629.18和1.74。（1-x）CaTiO3/xNi0.5Zn0.5Fe2O4复合材料显示磁性。其中x=0.7时,样品饱和磁化强度（Ms）达到49.07A·m2/kg;这归因于Ni0.5Zn0.5Fe2O4具有优异的磁性能。
