低损耗ZrO_(2)@CIPs核壳型软磁复合粉体制备及磁感应性能研究

Synthesis and magnetic induction characteristic oflow-loss ZrO_(2)@CIPs soft magnetic composites with core-shell structure

利用正丁醇锆(TBOZ)溶液对羰基铁粉(CIPs)进行了表面改性处理。通过调整原料中TBOZ的添加量,合成了3组不同锆含量的二氧化锆包覆羰基铁粉(ZrO_(2)@CIPs)复合材料。分析了CIPs和ZrO_(2)@CIPs复合材料的静态磁性能以及绝缘性能,结果表明,使用温度提高至200℃时,ZrO_(2)的存在能有效抑制CIPs的氧化所导致的静态磁性恶化;且ZrO_(2)@CIPs复合材料的电阻率得到大幅度提升。比较包覆前后CIPs的磁损耗能力的变化,发现随着原料TBOZ添加量的增加,ZrO_(2)@CIPs复合材料降低磁损耗的能力增强,直流偏置特性提高。当TBOZ添加量为15.57 mL时,在频率为1 MHz时,ZrO_(2)@CIPs磁导率虚部仅为0.05,品质因数为116.7,饱和电流达到17.10 A。而且相较于CIPs的-0.91 V,ZrO_(2)@CIPs的腐蚀电位提高至-0.33 V,这无疑提高了传统CIPs的耐腐蚀性。总的来说,上述实验结果为电感领域内传统CIPs的改性处理提供了技术方案参考。

The surface modification of carbonyl iron powders(CIPs)was carried out by using zirconium butoxide(TBOZ)solution.Zirconium dioxide coated carbonyl iron powders(ZrO_(2)@CIPs)composites with different zirconium content were synthesized by adjusting the amount of TBOZ.The static magnetic properties and insulating properties of CIPs and ZrO_(2)@CIPs composites have been investigated,and it has been shown that ZrO_(2) can effectively suppress the deterioration of the static magnetic property of CIPs when the temperature is increased to 200℃.Meantime,the resistivity of ZrO_(2)@CIPs composites has been greatly improved.Comparing the magnetic loss capacity of CIPs and ZrO_(2)@CIPs composites,it can be found that the magnetic loss capacity and DC bias properties of ZrO_(2)@CIPs composites are improved with increasing the amount of TBOZ.When the amount of TBOZ is 15.57 mL,theμ″of ZrO_(2)@CIPs composites is only 0.05,quality factor is 116.7,and the rated current is 17.10 A.In addition,compared with CIPs(-0.91 V),the corrosion potential of ZrO_(2)@CIPs composites is increased to-0.33 V,demonstrating the enhanced corrosion resistance.In general,the results of this work can be served as a reference for the modification of conventional CIPs in the inductance domain.