烧结对低功耗掺杂MnZn铁氧体性能的影响

Effect of Sintering on the Properties of Low Power Loss Doped MnZn Ferrites

烧结是功率铁氧体研制过程中极为重要的一个环节。文中详细分析了不同烧结温度对样品微结构的影响,以及烧结温度对不同掺杂的低功耗MnZn铁氧体材料磁性能以及功耗的影响。结果表明,样品烧结温度过低,样品中晶粒大小悬殊,气孔分散于晶粒和晶界内部,导致其磁导率降低,矫顽力增大,功耗上升;同时,过高的温度将使晶粒异常长大,导致某些杂质局部熔融而使晶界变形,从而降低了铁氧体的性能。

Sintering is an important process on the preparation of power loss MnZn ferrites. In this paper, the influence of different sintering temperatures on the microstructure of samples is analyzed, and the effects of the sintering temperatures on the magnetic properties and loss power of MnZn ferrites with different dopants are described. The results indicate that the lower sintering temperature will lead to lower permeability and the increasing of the power loss and the coercive force. At lower sintering temperature, the grain sizes are nonuniform, and the pores disperse the inner of crystal grain and grain boundary in MnZn ferrites. Meanwhile, this paper presents that, at higher sintering temperature, a normal can be observed, and then the performance of MnZn ferrites is reduced.