纳米晶Fe-5%Ni软磁复合材料的制备及磁性能研究  

Preparation and magnetic properties of nanocrystalline Fe-5 wt%Ni soft magnetic composites

作　　者：肖悦[1] 沈智[1] 何雪龙 XIAO Yue;SHEN Zhi;HE Xuelong(School of Mechanical Engineering, Nanchang Institute of Technology, Nanchang 330099, China)

机构地区：[1]南昌工程学院机械工程学院,南昌330099

出　　处：《功能材料》2021年第11期11144-11148,共5页Journal of Functional Materials

基　　金：江西省教育厅科技资助项目(GJJ201903,GJJ151106)。

摘　　要：采用机械合金化方法制备了Fe-5%Ni(质量分数)纳米晶粉末,通过压实、涂覆环氧树脂和在不同退火温度(550,600,650和700℃)下热处理得到了纳米晶Fe-5%Ni(质量分数)软磁复合材料,并对软磁复合材料的结构、微观形貌和磁性能进行了表征。结果表明,纳米晶Fe-5%Ni软磁复合材料主要以体心立方(bcc)和面心立方(fcc)的结构为主,在球磨40 h时,Fe-5%Ni纳米晶粉末的晶化程度最好;随着退火温度的升高,样品的尺寸逐渐增大,基本都分布在40~90μm之间,表面呈现出片层状结构,在650℃下退火的样品尺寸大小分布均匀,无团聚现象,形貌最佳;在4种不同退火温度下,样品的磁滞回线都较为狭窄细长,饱和磁化强度都比较高,矫顽力和剩余磁化强度都较小,所有样品均具有软磁材料的特点。随着退火温度的升高,样品的饱和磁化强度表现出先升高后降低的趋势,剩余磁化强度呈现出先降低后略微升高再降低的趋势,而矫顽力呈现出先降低后略微升高的趋势。在650℃下退火的样品磁化强度最大,为33.1 Am^(2)/kg;在600℃下退火的样品剩余磁化强度最低,为0.76 Am^(2)/kg;在650℃下退火的样品矫顽力最低,为25.58 Am^(2)/kg。综合来看,球磨时间40 h,在650℃下退火制备的纳米晶Fe-5%Ni软磁复合材料的性能最优。Fe-5 wt%Ni nanocrystalline powder is prepared by mechanical alloying.The nanocrystalline Fe-5 wt%Ni soft magnetic composites are obtained by compaction,coating epoxy resin and heat treatment at different annealing temperatures(550,600,650 and 700℃).The results show that the nanocrystalline Fe-5 wt%Ni soft magnetic composites are mainly body centered cubic(bcc)and face centered cubic(fcc)structures.The crystallization degree of Fe-5 wt%Ni nanocrystalline powder is the best when it is milled for 40 h.With the increase of annealing temperature,the size of the samples increases gradually,and they are basically distributed in 40~90μm.The surface presents a lamellar structure.The samples annealed at 650℃have uniform size distribution with no agglomeration and the best morphology.At four different annealing temperatures,the hysteresis loops of the samples are narrow and slender,the saturation magnetization is relatively high,and the coercivity and residual magnetization are small.All samples have the characteristics of soft magnetic materials.With the increase of annealing temperature,the saturation magnetization of the samples increases first and then decreases,the residual magnetization decreases first,then slightly increases and then decreases,and the coercivity decreases first and then slightly increases.The maximum magnetization of the samples annealed at 650℃is 33.1 Am^(2)/kg.The residual magnetization of the samples annealed at 600℃is the lowest,which is 0.76 Am^(2)/kg.The coercivity of the samples annealed at 650℃is the lowest,which is 25.58 Am^(2)/kg.In general,the nanocrystalline Fe-5 wt%Ni soft magnetic composites prepared by ball milling for 40 h and annealed at 650℃have the best properties.

关 键 词：机械合金化 Fe-5%Ni纳米晶粉末 软磁复合材料 热处理 磁性能 

分 类 号：TM271.2[一般工业技术—材料科学与工程]