中文摘要：

采用模压成型成功制备了Fe-Ni基纳米晶磁粉芯。并研究了热处理温度和时间、纳米晶粉体的粒度、成型压力等对其磁性能的影响和其温度稳定性和频率稳定性。结果表明,当100～900℃内退火,随着温度升高,μe和Q值都呈先增后减,600℃时μe达到最大值31.5,其最佳退火时间为2h。成型压力和纳米晶粉体粒度越大,μe越大,Q值越小。在100～1000kHz内,磁粉芯具有较好的频率稳定性。在25～100℃内,随着温度的升高,μe逐渐下降,其中25～40℃内,μe变化敏感,温度系数αμ为-1.95×10-3℃-1,而高于40℃时,其温度系数αμ仅为-2.48×10-4℃-1。

英文摘要：

The dust core of Fe-Ni based crystalline have been successfully fabricated by compression molding method.The effects of annealing temperature and time,the grain size and the forming pressure on the magnetic property of dust cores and its temperature stability and frequency stability were investigated.The results show that the permeability and quality factor of dust core first increase and then decrease with the increase of annealing temperature,the μe to the maximum of 31.5 at 600℃,and its best annealing time is 2h.The bigger of grain size and molding pressure,the better of magnetic property of dust core.When the test frequency changes from 100 to 1000kHz,the core shows the optimal stability of frequency.The μe gradually decrease as soon as increasing environmental temperature in the range of 25 to 100℃.Especially in the range of 25 to 40℃,its μe changes greatly,and its temperature coefficient is-1.95×10^-3℃-1,however,when the environmental temperature over 40℃ it is only-2.48×10^-4℃^-1.