纳米晶复合Pr_2Fe_(14)B/α-Fe永磁材料磁性的研究  

Study of magnetic properties of Pr_2Fe_(14)B/α-Fenanocomposite magnets

作　　者：庞利佳[1] 孙光飞[1] 陈菊芳[1] 强文江[1] 张锦标 黎文安 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]广东省新会市宇宏科技有限责任公司,广东529100

出　　处：《物理学报》2006年第6期3049-3053,共5页Acta Physica Sinica

基　　金：国家高技术研究发展计划(863)(批准号:2002AA302602);北京市自然科学基金(批准号:2032011)资助的课题~~

摘　　要：采用熔体快淬的方法制备Pr2Fe14B/α-Fe纳米晶复合永磁材料.使用振动样品磁强计(VSM)测量样品的室温磁性能.实验合金成分为(PrxFe94·3-xB5·7)0·99Zr1(其中x=8·2,8·6,9·0,9·4,9·8,10·2,10·6,11·0,11·4(原子分数,%)).系统地研究了辊速及合金成分对快淬带磁性能的影响,当Pr原子分数由8·2%—11·4%变化时,矫顽力Hci升高,但剩余磁极化强度Jr却降低了,这是导致最大磁能积(BH)max下降的原因.当x=8·2(%)时,尽管样品的Hci较低,但高的Jr使(BH)max的值达到很高,在辊速为25m/s时得到最佳磁性能为:Jr=1·37T,Hci=501·19kA/m,(BH)max=227·93kJ/m3·同时发现垂直带面方向的Jr和(BH)max远高于平行带面方向.Pr2Fe14B/α-Fe nanocomposite magnets were prepared by the melt-spinning technique. The magnetic properties of the magnets were measured by means of a vibrating sample magnetometer（VSM）. Alloy compositions were （PrxFe94.3-xB5.7 ）0.99Zr1 with x =8.2, 8.6, 9.0, 9.4, 9.8, 10.2, 10.6, 11.0 and 11.4（atomic fraction,%）. The effects of the wheel speed and alloy composition on the magnetic properties of melt-spun ribbons were investigated systematically. A decrease of remanence Jr with the increase of atomic fraction of Pr is observed causing an increase in coercivity Hci when changing Pr fraction from 8.2% to 11.4 % which is believed to be the cause of the decrease in maximum energy product （ BH）max. Despite the low value of Hci obtained for the 8.2 % Pr alloy, （BH）max is substantially raised by the high Jr which reflects the high volume fraction of α-Fe phase. The Jr, Hci and （BH）max of the best sample quenched at a wheel speed of 25 m/s are 1.37T, 501.19kA/m and 227.93kJ/m^3 , respectively. The magnetic properties in the direction perpendicular to the ribbon surface are much higher than that in the direction parallel with the ribbon surface.

关 键 词：纳米复合永磁材料 熔体快淬 PR2FE14B/Α-FE 磁性 

分 类 号：O482.52[理学—固体物理]