以共沉淀法预烧粉为原料,研究了烧结温度及烧结气氛对MnZn高导铁氧体磁性能的影响,采用SEM对其微观结构进行了表征。结果表明,随着烧结温度升高,MnZn高导铁氧体的μi增加;合适的烧结条件能促进晶粒生长,减少气孔产生,增大烧结密度,使晶界变细,提高初始磁导率和改善频率特性。当温度为1380℃,保温气氛为3.0%时,MnZn高导铁氧体的μi为13000,且有较好的频率特性,在150kHz时μi能维持在10000以上。
The influence of sintering conditions on the magnetic properties of MnZn high initial permeability ferrite from coprecipitation-preroasting powders were studied and phase composition and microstructure of samples were investigated by XRD and SEM.The results show that the initial permeability increase,with the increased sintering temperature,and an increase of its frequency characteristic with increasing oxygen partial pressure is observed.When the sintering temperature is 1380℃ and the oxygen partial pressure is 3.5%,all the magnetic properties come to the best.The initial permeability can reach more than 13000 and is mainly unchanged to 150kHz.The study indicates that appropriate sintering conditions can promote the growth of gains,reduce the amount of pores,increase the sintering density and coercive force,the grain boundary became thinner,consequently increase initial permeability and improve the frequency characteristics.
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