快凝Nd-Fe-B厚带的制备与组织结构  

Fabrication and Structure of Rapid Solidified Nd-Fe-B Thick Ribbons

作　　者：惠希东[1] 王建国[1] 韩凌[1] 寇宏超[1] 

机构地区：[1]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《北京科技大学学报》2004年第1期69-72,共4页Journal of University of Science and Technology Beijing

基　　金：国家"973"基金资助项目(G200067201-3)

摘　　要：采用单辊快凝法取代传统的铸锭法制备出了厚度为0.1～0.4mm的NdFeB厚带.通过对制备快凝厚带过程中不同的工艺参数的探索,获得了工艺参数、带片厚度及显微组织间的关系.结果表明:制备0.25～0.35mm厚带的最佳工艺参数为:辊轮转速在10m/s左右,喷射压力0.08～0.10MPa,辊嘴间距(2±0.5)mm.当带片厚度为0.3mm时,带片中以Nd2Fe14B相为主,沿着(410)方向Nd2Fe14B含量比例较大;其显微结构主要是Nd2Fe14B片状晶,富Nd薄层相之间的间距约为5 μm.带片厚度为0.4mm时,厚带试样中α-Fe含量明显大于Nd2Fe14B含量,并且择优取向变成了(008).厚度0.1mm的厚带的显微结构中是细小的急冷等轴晶,厚度0.4mm的厚带中有较大区域的等轴晶.The Nd-Fe-B Ribbons of 0.1-0.4 mm thick were fabricated by using single roll melt spinning in replace of the traditional casting method. The relationship among the technological parameters, the thickness of ribbons and the microstructure is obtained. In order to fabricate the Nd-Fe-B ribbons of 0.25-0.35 mm thick, the optimum technological parameters should be controlled in the following range. The rolling velocity is about 10m/s, the jet pressure is 0.08-0.10 MPa, and the gap between the roll and the nozzle is (2±0.5) mm. The microstructure of the ribbon of 0.3 mm thick is mainly composed of lamellar Nd2Fe14B phase, which grows in the preferred orientation of <410>, and the spacing between the Nd-rich phases is 5 nm. For the ribbon of 0.4mm thick, the amount of α-Fe is obviously higher than that of Nd2Fe14B, and the preferred orientation is <008>. The microstructure of the ribbon of 0.1 mm thick is composed of fine equiaxed grains, but that of the ribbon of 0.4mm thick, of thick equiaxed grains.

关 键 词：单辊快凝法 Nd-Fe-B厚带 制备工艺 组织结构 Nd2Fe14B相 稀土永磁体 

分 类 号：TG132.27[一般工业技术—材料科学与工程]