熔淬法制备Mn_xBi_(100-x)永磁合金的成相过程和磁性能  

Phase formation behavior and magnetic properties of Mn_xBi_(100-x) permanent magnetic alloys prepared by melt-spinning

作　　者：蒋欢畅[1] 张朋越[1] 葛洪良[1] 张素银[1] 

机构地区：[1]中国计量学院材料科学与工程学院,浙江杭州310018

出　　处：《磁性材料及器件》2014年第2期6-8,共3页Journal of Magnetic Materials and Devices

基　　金：国家自然科学基金资助项目(51001092;51271172);国家质检公益性行业科研专项(201210107);江苏省科技计划项目(BE2011114);浙江省创新团队计划项目(2010R50016)

摘　　要：采用熔体快淬及热处理制备了MnxBi100-x(x=46、52、56、60、62)永磁材料。利用差热分析、X射线衍射和振动样品磁强计对该系列合金的结构和磁性能进行了表征。研究了合金中Mn含量对合金低温相形成的影响。结果表明,熔体快淬方法能有效地避免Mn的偏析,再经过真空热处理能够制备高纯度的低温相MnBi合金。随着Mn含量的增加,矫顽力和最大磁能积均呈先增后减。当Mn含量为56at%时,矫顽力和最大磁能积均达到最大值,分别为0.19T和5.97kJ/m3。Permanent magnetic MnxBi100-x（x=46, 52, 56, 60, 62） alloys were prepared by melt-spinning, followed by heat treatment. The samples were characterized by means of differential thermal analysis, X-ray diffractometer and vibrating sample magnetometer. The influence of Mn content on the formation of low temperature phase was systematically studied. Results shows that segregation of Mn during peritectic reaction can be eliminated by rapid solidification, and low temperature phase （LTP） can be formed by annealing the as-spun ribbons. Both coercivity and magnetic energy product are found to increase first and then decrease with increasing Mn content, with maximum Br of 0.19T and （BH）max of 5.97kJ/m3 for Mn content of 56at%.

关 键 词：MnBi合金 熔淬 热处理 成相 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]