TiO_(2)掺杂对MnZn功率铁氧体性能的影响

Effect of TiO_(2)doping on properties of MnZn power ferrite

采用传统氧化物陶瓷法制备低功耗的MnZn功率铁氧体,研究了TiO_(2)掺杂对功率铁氧体微观结构、饱和磁感应强度、起始磁导率和功率损耗的影响。结果表明:适量添加TiO_(2)能够改善晶粒均匀性,提高饱和磁感应强度、起始磁导率,降低损耗尤其是低温损耗,但是加入过多的TiO_(2)会导致晶粒异常长大,饱和磁感应强度降低,高温损耗恶化。当TiO_(2)含量为0.25%时,铁氧体烧结样品的晶粒尺寸大小均匀,饱和磁感应强度达到最大值,损耗较低。

Low power MnZn power ferrites were prepared using traditional oxide ceramic methods.The effects of TiO 2 doping on the microstructure,saturation magnetic induction,initial magnetic permeability,and power loss of power ferrites were studied.The results show that adding an appropriate amount of TiO_(2)can improve grain unifor-mity,increase saturation magnetic induction strength,initial magnetic permeability,and reduce losses,especially at low temperatures.However,adding too much TiO_(2)can cause abnormal grain growth,decrease saturation magnetic induction strength,and worsen high temperature losses.When the TiO_(2)content is 0.25%,the ferrite sintered sam-ples have uniform grain size,maximum saturation magnetic induction strength,and low loss.