纳米级NiZnCu铁氧体粉的晶粒尺寸对瓷体性能影响

The effect of particle size of nano NiZnCu ferrite powders on sintering behavior, microstructure and electromagnetic properties

用柠檬酸盐溶胶-凝胶法制备的(Ni0.2Zn0.6Cu0.2)Fe2O4铁氧体粉体,通过不同的预烧温度控制粉体的粒径,制得不同晶粒大小的纳米粉体,采用两种烧结工艺实现NiZnCu铁氧体的低温烧结。利用XRD、SEM、TEM,频谱仪等分析了不同初始晶粒尺寸对烧结性能和铁氧体陶瓷电磁性能的影响,总结了烧结后晶粒尺寸对瓷体性能的影响规律,研制出细晶、高磁导率、高电阻率的低温烧结NiZnCu铁氧体陶瓷材料,其初始磁导率≥1000,电阻率比固相法提高了两个数量级。

Nanostructured spinel （Ni0.2 Zn0.6Cu0.2 Fe2O4） powders were fabricated by a citrate precursor sol-gel method. The original particle size was dominated by different calcining temperature. The nanocrystal powders can be sintered by different sintering methods under a low temperature（≤950℃）. The sintering behavior,microstructures and electromagnetic properties of ferrite ceramics were investigated by X-ray diffractometer（XRD）, transmission electron microscope （TEM）, scanning electron microscope （SEM） and measurements of permeability and resistivity. The effect of particle size on sintering, microstructure and electromagnetic properties were obtained,and we achieved high performance NiCuZn ferrite with ultrafine microstructure and high initial permeability of up to 1000 and DC resistivity above 10^10Ω·cm.