正交实验法优化降温速率制备高磁导率高饱和磁通密度MnZn铁氧体研究

采用正交实验研究了不同降温段的降温速率对MnZn铁氧体磁导率温度稳定性的影响,并在此基础上优化了降温曲线。结果表明,通过正交实验法优化降温曲线,可以制备更加均匀显微结构和较大晶粒尺寸的样品,从而成功地制备得到了高磁导率(μi)高饱和磁通密度(Bs)锰锌铁氧体材料。当降温段1350~1150℃、1150~1000℃和1000~700℃的降温速率分别为0.83℃/min、5.0℃/min和5.0℃/min时,烧结的MnZn铁氧体具有均匀的微观结构和优良的磁性能。此时,烧结体在0~190℃温度区间和应用频率f≤530k Hz时保持高磁导率(μi5000),同时在常温下具有高的饱和磁通密度Bs=530 m T。

Study on fabricating MnZn ferrite with both high permeability and high saturation magnetic flux density via orthogonal experiment to optimize cooling rate

In this paper, the influence of cooling rate in sintering process on the magnetic properties of MnZn ferrite was investigated through orthogonal experiments designed by using Taguchi method. Then the cooling curve was optimized based on results of orthogonal experiments. The samples with more uniform microstructure and larger size were synthesized and therefore the manganese zinc ferrites with both high magnetic permeability (μi) and high saturation magnetic flux density (Bs) were successfully achieved. For optimal cooling rates of 0.83℃/min, 5.0℃/min and 5.0℃/min in the temperature range of 1350 to 1150℃, 1150 to 1000℃ and 1000 to 700℃, respectively, the sintered MnZn ferrite possesses uniform microstructure and excellent magnetic performance such asμi>5000 atf≤530 kHz in the temperature range from 0 to190℃, andBs=530 mT at 25℃.