定向凝固/热压R-Fe-B 永磁合金的研究  

DIRECTIONAL SOLIDIFIED/HOT PRESSED R-Fe-B PERMANENT MAGNET ALLOY

作　　者：陈钟敏[1] 谢发勤[1] 史正兴[2] 王乐仪[1] 傅恒志[1] 

机构地区：[1]西北工业大学 [2]西北工业大学403教研室,教授西安710072

出　　处：《材料科学进展》1991年第6期477-481,共5页

基　　金：国家自然科学基金;9589014-02;中国科学院物理研究所磁学开放实验室部分资助

摘　　要：研究了各向异性定向凝固/热压 R-Fe-B 永磁合金的制备过程、成分和性能。成分为Pr_(19)Fe_(74.5)B_5Cu_(1.5)的合金经快速定向凝固和充分热压变形后,具有细小、致密的晶粒组织和平行压缩变形方向的感生磁各向异性,磁性能 B_r=870mT,_iH_c=1003kA/m,(BH)_m=116kJ/m^3。Nd_(19)Fe_(74.5)B_5Cu_(1.5)和 Pr_(19)Fe_(76)B_5合金因晶粒粗大,只具有极低的矫顽力。Anisotropic directional solidified/hot pressed R-Fe-B permanent mag-net alloys are prepared and investigated.The typical composition of the alloys isPr_(19)Fe_(74.5)B_5Cu_(1.5).After directional solidification,a fine-grained columnar structure parallelto the solidification direction and plane anisotropy perpendicular to the solidificationdircetion are formed in the typical alloy.Magnetic properties B_r=660mT,_iH_c=438kA/m,and(BH)_m=55kJ/m^3 are obtained.After hot pressing,the columnargrains are“rushed”to finer and denser equiaxial grains and their easy-axes are alignedalong the compression direction.Magnetic properties are thus raised B_r=870mT,_iH_c=1003kA/m and(BH)_m=116kJ/m^3.While a much lower coercivity is obtained inNd_(19)Fe_(74).5B_5Cu_(1.5) and Pr_(19)Fe_(76)B_5 alloy due to their coarse-grained structure.

关 键 词：凝固 热压 永磁合金 工艺 磁性 

分 类 号：TG132.26[一般工业技术—材料科学与工程]