MnBi/Sm_(2)Co_(17)复合磁粉制备、磁性能及微结构研究  

Preparation, Magnetic Properties and Microstructure of MnBi/Sm_(2)Co_(17) Composite Magnetic Powder

作　　者：单杰锋 俞能君 张素银[2] 金向阳 吴琼[2] 张朋越[2] 葛洪良[2] Shan Jiefeng;Yu Nengjun;Zhang Suyin;Jin Xiangyang;Wu Qiong;Zhang Pengyue;Ge Hongliang(China Jiliang University,Hangzhou 310018,China;Zhejiang Zhongyuan Magnetic Industry Co.,Ltd,Jinhua 322100,China)

机构地区：[1]中国计量大学材料与化学学院,浙江杭州310018 [2]中国计量大学,浙江杭州310018 [3]浙江中元磁业股份有限公司,浙江金华322100

出　　处：《稀有金属材料与工程》2021年第4期1448-1454,共7页Rare Metal Materials and Engineering

基　　金：国家青年基金(51801196);国家重点研发计划(2019YFF0217203);国家自然科学基金(51871205)。

摘　　要：采用化学辅助高能球磨工艺制备了MnBi/Sm_(2)Co_(17)纳米晶复合磁粉,研究了MnBi合金添加量对复合磁体磁性能和微结构的影响。随着MnBi合金添加量的增加,复合磁粉的内禀矫顽力先稍上升,后基本保持不变,但均低于纯MnBi磁粉的864kA/m;磁粉的饱和磁化强度和剩余磁化强度均逐渐下降。复合磁粉中没有发现明显的元素互扩散现象。采用Henkel曲线分析了复合磁体的交换耦合作用,复合磁粉的δM在添加量为15%(质量分数)时达到极大值,说明该复合磁体具有较强的交换耦合作用,结合磁粉形貌分析了随着MnBi合金添加量的增加复合磁粉剩磁比的演变规律。The MnBi/Sm_(2)Co_(17) magnetic composite powder was prepared by chemically assisted high-energy ball milling process, and the effect of the content of MnBi alloy on the magnetic properties and microstructure of the composite powder was studied. As the content of MnBi alloy increases, the coercivity of the composite powder first increases slightly, and then keeps stable at about 640 kA/m, while the coercivity of all the composite powder is lower than 864 kA/m of pure MnBi milled powder;the saturation magnetization and remanent magnetization of the composite powder gradually decrease. No obvious elements interdiffusion is found in the composite magnetic powder. The exchange coupling effect of the composite powder was analyzed by the Henkel curve. The δM of the composite magnetic powder reaches the maximum value when the MnBi addition amount is 15 wt%, indicating that the composite powder has a strong exchange coupling effect. The evolution of the remanence ratio of the composite magnetic powder with the increase of MnBi alloy content has been analyzed depending on the morphology and the exchange coupling effect of the composite magnetic powder.

关 键 词：MnBi/Sm_(2)Co_(17)复合材料 磁性能 微结构 交换耦合作用 

分 类 号：TM272[一般工业技术—材料科学与工程]