粉体粒度对Fe73.5Cu1Nb3Si13.5B9纳米晶磁粉芯性能的影响

采用熔体快淬后脆化粉碎的方法制备Fe73.5Cu1Nb3Si13.5B9纳米晶磁粉,经模压成型制备出磁粉芯,研究粉体粒度对磁导率和品质因数Q的影响。结果表明:制备的磁粉芯具有良好的频率特性,粉体粒度对磁粉芯性能呈现规律性的影响,粉体粒度加大,磁粉芯的有效磁导率μe增加,Q值的峰值减小;理论模型的推导结果也证实粉体粒度与磁粉芯磁导率之间的关系;采用调整粉体粒度的方法,是制备不同使用性能要求磁粉芯的一种有效途径。

Influence of particle size on the performance of nanocrystalline magnetic powder core

The Fe73.5Cu1Nb3Si13.5B9 nanocrystalline powder was prepared by flux quenching and embrittlement crushing.The magnetic cores were prepared by compression moulding of the prepared powder.The effect of particle size on permeability and quality factor Q of Fe73.5Cu1Nb3Si13.5B9 nanocrystalline powder cores was researched.The results show that the prepared powder cores possess good frequency characteristics.The permeability μe increases while the quality coefficient Q value decreases with the increase of particle size of magnetic core.The theoretical model also confirms the relationship between particle size and magnetic properties.It shows that the Fe73.5Cu1Nb3Si13.5B9 nanocrystalline powder cores with different properties could be obtained by adjusting the particle size of magnetic core.