熔淬铜辊转速与浇铸温度对MM-Fe-B铸片组织和性能的影响  

Effect of melt-spinning copper roller speed and casting temperature on the microstructure and magnetic properties of MM-Fe-B strip cast

作　　者：王鑫 刘艳丽[1] 周建军 马强[1,2] WANG Xin;LIU Yan-li;ZHOU Jian-jun;MA Qiang(School of Science,Inner Mongolia University of Science and Technology,Baotou 014010,China;Inner Mongolia Key Laboratory for Utilization of Bayan Obo Multi Metallic Resources:Elected State Key Laboratory,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学理学院,内蒙古包头014010 [2]内蒙古科技大学内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010

出　　处：《磁性材料及器件》2021年第3期25-29,共5页Journal of Magnetic Materials and Devices

摘　　要：采用粉末冶金工艺制备烧结MM-Fe-B混合稀土磁体。针对真空感应片铸工艺制备铸片出现的大量"岛状"凸起现象,对浇铸温度和铜辊转速进行优化。采用扫描电子显微镜(SEM)评价MM-Fe-B铸片截面的微观结构。当浇铸温度为1380℃、铜辊转速为42 r/min时获得表面平整度高、富稀土相均匀包围2:14:1主相的柱状晶结构的铸片,解决了MM-Fe-B铸片不易形成柱状晶结构且表面出现大量"岛状"形貌的问题。制备的MM-Fe-B烧结磁体的磁性能为:B_(r)=11.53 kG,H_(cj)=1.405 kOe,(BH)_(max)=12.03 MGOe。Misch-metal iron boron(MM-Fe-B)sintered magnet was prepared using powder metallurgy technology.On account of a large number of"island"protrusion phenomena appeared in MM-Fe-B strip by vacuum induction strip casting process,the casting temperature and copper wheel speed were optimized for the strip casting process.Scanning electron microscope(SEM)was used to evaluate the microstructure of MM-Fe-B strip cross-section.For casting temperature of 1380℃and copper roller rotating speed of 42 r/min,the columnar crystal structure with high surface flatness and uniform RE-rich phase surrounded by 2:14:1 main phase was obtained.The problem that the columnar crystal structure is not easy to form and a large number of"island"morphs appears on the surface of MM-Fe-B strip has been solved.MM-Fe-B sintered magnets with B_(r)=11.53 kG,H_(cj)=1.405 kOe,(BH)_(max)=12.03 MGOe were prepared.

关 键 词：混合稀土烧结磁体(MM-Fe-B) 熔淬 铸片 微观结构 磁性能 

分 类 号：TM273[一般工业技术—材料科学与工程]