高磁导率MnZn铁氧体TL13材料的研制

Study of High μ i TL13 MnZn Ferrite Materials

介绍了利用氧化物法制备高磁导率（μｉ＝１３５００）ＭｎＺｎ铁氧体ＴＬ１３材料的研制情况。通过对烧结制度如温度、气氛曲线实行精确控制，使铁氧体中保持适当的Ｆｅ２＋含量，同时尽量减少铁氧体中Ｚｎ的挥发，这是获得高磁导率ＭｎＺｎ铁氧体的重要保证。Ｚｎ挥发对铁氧体的显微结构特别是磁芯表层显微结构有较大影响，Ｚｎ的挥发会促进晶粒生长，同时使磁芯表面呈多孔状结构。由于Ｚｎ挥发会随着烧结温度的升高而急剧增大，选择合适的烧结温度非常重要。由于采用了较好的制造工艺方法，ＴＬ１３铁氧体材料具有很好的频率特性，当ｆ＞１００ｋＨｚ时，μｉ才开始下降。

The research and development of TL13 MnZn ferrite material with high initial permeability( μ i =13500)by oxide synthetic method were reported in this paper.It shows that the ferrite core must contain proper Fe 2+ content by accurately controlling the sintering conditions such as sintering temperature and atmosphere,and reducing the Zn evaporation from the ferrite cores.The Zn evaporation has great influence on the microstructure especially in the region near the surface of the ferrite cores and it promotes the grain growth.For the Zn evaporation increases rapidly with increasing sintering temperature,the sintering temperature should be chosen properly.The TL13 MnZn ferrite material has excellent frequence response,because the initial permeability μ i begins to decrease only when the frequency f ≥100kHz.