Fe/Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9纳米晶磁粉芯研究

采用Fe粉复合FeCuNbSiB纳米晶粉体制备了磁粉芯,并讨论了退火温度、Fe粉复合量、纳米晶粉体粒度以及绝缘剂等对磁粉芯磁性能的影响.结果表明,在200～350℃和350～400℃内退火,随着温度的升高,μ_e均呈先增大后减小,375℃时达到最佳;当复合Fe粉后,发现其软磁性能得到了明显改善, Fe粉量为40%时,μ_e达到最大,且在100kHz～1MHz内,频率稳定性良好,其中心频率在500kHz附近,并随Fe粉量的增加而向低频发生偏移.纳米晶粉体的粒度越大,磁粉芯的磁性能越好;粉体粒度为100～200目时,其μ_e达到最大.当375℃退火,由有机绝缘剂、40%(质量分数)Fe粉、100～200目纳米晶粉制备的磁粉芯,其μ_e达52.72、损耗Pu为0.01317J/m~3、Bs为3.92×10~(-3)T、Br=6.48×10~(-5)T、H_c为1.28A/m.

Study on dust core of Fe/Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 nanocrystalline composite powder

The effects of annealing temperatures, the amount of iron powder, the grain size of the nanocrystalline powder, insulating compound on the magnetic property of dust cores which were successfully prepared by mixing iron powder to FeCuNbSiB nanocrystalline powder were discussed. The results show that the permeability of magnetic powder core first increases and then decreases with the increasing of annealing temperature, and to the best at 375℃, for the temperature of 200-350 and 350-400℃. It is interesting to note that the significant improvement of its soft magnetic property after compositing iron powder, especially, the amount of iron powder is 40wt%, the value of its permeability is to maximum. And in the range of 100-1000kHz, it reveals optimal stability of frequency and the offsetting of its center frequency from 500kHz to low frequency with the increasing of the addition of iron powder. The bigger of grain size of nanocrystalline powder, the better of magnetic property of dust core; and the permeability can be up to the most in the particle size of 100-200 mesh. Under the annealing temperature of 375℃, the magnetic powder core was prepared by compositing of the organic insulating compound, the amount of iron powder of 40wt%, the nanocrystalline powder of 100-200 mesh, and its effective permeability raises up to 52.72, the loss power of 0.01317J/m~3, the saturation induction density of 3.92×10~(-3)T, the residual magnetic flux density of 6.48×10~(-5)T, the coercive force of 1.28A/m.