纳米复合永磁材料晶粒择优取向的研究  

Preferential Crystalline Orientation in Nanocomposite Permanent Magnet Materials

作　　者：庞利佳[1] 乔祎[1] 陈菊芳[1] 孙光飞[1] 祁毓俊[1] 胡权霞[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《中国稀土学报》2004年第6期773-777,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家863纳米专项(2002AA302602);北京市自然科学基金资助项目(2032011)

摘　　要：利用熔体快淬技术制备了(Nd11.4Fe82.9B5.7)0.99M1(其中M=Zr,Nb,Ga,Zr+Ga,Nb+Ga)快淬带。发现Ga元素的添加对Nd2Fe14B相晶粒的c轴垂直于带面取向是有利的。复合添加Zr+Ga或Nb+Ga可获得较好的磁性能,并且进一步提高了快淬带晶粒的择优取向。取向度随厚度改变发生明显的变化,当带厚约为120μm时取向度最高。热处理可使淬带织构度增加,但导致晶粒粗化。利用深冷技术对纳米晶复合快淬带进行超低温处理。发现深冷处理有利于快淬带织构度的增强,且晶粒尺寸几乎不变。Melt-spun (Nd_(11.4)Fe_(82.9)B_(5.7))_(0.99)M_1 ribbons (M=Zr, Nb, Ga, Zr+Ga, Nb+Ga) were prepared by the melt-spinning technique. Ga addition is found to be effective for the orientation of c axis of Nd_2Fe_(14)B grains perpendicular to the ribbon plane. Better magnetic properties can be achieved by adding both the two kinds elements Zr+Ga, Nb+Ga, and it is found that the preferential orientation is further improved. The alignment degree changes with the ribbon thickness and is highest when ribbon thickness is 120 μm. The heat-treatment can improve the texture degree, but lead to coarse grains. The effects on magnetic properties and texture degrees of nanocomposite magnets after cryogenic treatment were studied. The result shows that the cryogenic treatment is benefitcial to the texture degree enhancement of melt-spun ribbon while the grain size changes only a little.

关 键 词：纳米复合永磁材料 择优取向 织构 取向度 稀土 

分 类 号：TM273[一般工业技术—材料科学与工程]