制备了高频MnZn功率铁氧体,研究了添加CaO和V2O5对高频MnZn铁氧体性能的影响.结果表明: 对于工作频率高于500 kHz的MnZn功率铁氧体, 增加CaO的添加量,可提高晶界电阻率, 最大程度地降低涡流损耗;适当添加V2O5会形成液相烧结并使晶粒细化, 增加晶界,减少晶粒和晶界内的气孔率, 提高晶界电阻率, 降低材料的损耗.添加0.3%CaO和0.1%V2O5(质量分数, 下同),可以制备出致密、气孔率低和晶粒均匀(粒径3-5um)的高频功率铁氧体材料, 其起始磁导率约为1500, 磁芯损耗约为130 mW/cm3(500 kHz, 50 mT, 25℃).
The high frequency MnZn power ferrite was prepared by the conventional oxide ceramic process. The more quantity of CaO is needed to increase the grain boundary resistivity and suppress the eddy current loss of the high frequency MnZn power ferrite applied at frequencies higher than 500 kHz. An optimum concentration of V$_{2}$O$_{5}$ acting indirectly via liquid phase formation and influencing the microstructural development during sintering makes the crystalline grain be refined, the amount of grain boundary and grain boundary resistivity increase, the porosity decrease, and the power losses be suppressed. Adopting the complex additives containing 0.3, 0.15 and 0.1\% by weight of CaO, TiO$_{2}$ and V$_{2}$O$_{5}$, respectively, the MnZn power ferrite cores with initial permeability of about 1500, low power loss of about 130 mW$\cdot$cm$^{-3}$ (500 kHz, 50 mT, 25℃), grain diameter of 3$\sim$5 $\mu$m and low porosity can be prepared.
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