·116· 北京科技大学学报 1997年第1期 Magnetization and Demagnetization Behaviour for Nd Fe7.sBIss Nanocrystalline Alloy Liu Xupo Xiao Yaofu Dong Ming Material Science and Engineering School,UST Beijing,Beijing 100083,China ABSTRACT The magnetization feature under high magnetised fields and the effect of magnetised field on demagnetization behaviour for Nd,FeBs nanocrystalline alloy were investigated.The results indicate that the alloy is not saturated magnetised while magnetiza- tion-fieldm=7T.The material shows typical characteristics of permanent magnet as magnetization-field Hm is larger than a critical magnetization field Hme.The permanent magnet features of this alloy origine from exchange-coupling inteaction between crystalline grains. KEY WORDS nanocrystalline,magnetization,demagnetization 中中中中中中中中中中中中中中中中中中中中中中中中令中中中中中中中中争中中中中中中中中中中中中中中令中中中 (上接112页) 参考文献 1 Odarawa O,Ikeuchi J.J Jpn Inst Met,1981,45:316 2 Odarawa O.J Am Ceram Soc.1990,73(3):629 3 段辉平，股声，柳牧，赖和怡.94秋季中国材料研讨会论文集V.北京：化学工业出版社，1995 4《无机化学》编写组编《无机化学》（下）.北京：人民教育出版社，1978 Reactive Characteristics of Multi-component Thermit Duan Huiping Yin Sheng Lai Heyi Material Science and Engineering School,UST Beijing,Beijing 100083,China ABSTRACT The reactive characteristics of multi-component thermit,Fe,O,-CrO,- Nio-Al,were studied in detail by thermal analytical technique.The thermal properties of CrO,play an important role in the thermit reaction and effect on the composition of reaction products. KEY WORDS thermit,reactive characteristics,gasification. 1 1 6 . 北 京 科 技 大 学 学 报 19 9 7年 第 l期 M a g n e t i z a t i o n na d D em a g n e t i z a t i o n B e h va i o u r of r N d 4 F e 7 7 . SB l s . 5 N a n o e叮 s t a lli n e A ll o y Li u X咖 0 Xi a 口 Ya 咖 M a t e ri ai S e i e n e e na d E n g ni e e nri g S e h o o l , U S T D o n g 人五n g B e ij in g , B e ij in g 10 0 0 8 3 , C h ian A B S T R A C T T h e m a g n e ti z at i o n fe a tu re un d e r h i g h m ag n e ti s e d if e l d s an d ht e e fe e t o f m a g n e it s e d if e ld o n d e m a g n e t沈at i o n b e h a v i o ur of r N d ; F e 7 7 , S B ls , 5 n an o c 理s at llin e a ll o y w e er 访v e s it g at e d . T h e r e s u lt s in d i e at e ht at ht e a ll o y 1 5 . n o t s a ut r a t e d m a g n e it s e d w h il e m a gn e itZ a - t i o n 一 fi e l d 拜。 mH = 7 T . T h e m a t e ir a l s h 0 W s yt p i c a l c h ar c t e ir s t i c s o f p e mr an e n t m a g n e t a “ m ag n e t i z ait o n 一 fi e ld H击 1 5 l ar g e r ht an a e ir t i e a l m a g n e t沈a it o n fi e ld mH e . T h e Pe mr an e ln m ag n e t fe a t ir e s o f ht i s a ll o y o ir g in e for m e x e h an g e 一 e o uP lin g i n t e ac t i o n b e wt e e n e yr s at llin e gr a m s · K E Y W O R D S n an o e yr s at lli n e , m a g n e ti z a t i o n , d e m a gn e t i z at i o n (上接 1 12 页 ) 参 考 文 献 4 o d aJ 旧 w a o , kI e u e h i J . J PJ n nI s t M e t , 1 9 8 1 , 4 5 : 3 1 6 o d aj ar w a 0 . J A m C e amr S o e . 1 9 9 0 , 7 3(3 ) : 6 29 段辉平 , 殷声 , 柳牧 , 赖和怡 . 94 秋季 中国材料研讨 会论文集 I V . 北京 : 化学工业 出版社 , 1 9 95 《无机化学》编写组编 . 《无机化学》 (下 ) . 北京: 人 民教育 出版社 , 19 78 R e a e t i v e C h ar a e t e r i s t i e s o f M u l t i 一 c o m P o n e n t T h e mr it D u a n H 扮iP i n g iY n hS e n g L a i H 句 夕 i M a t e ir a l S e i e n e e an d E n g i n e e inr g S e h o l , U S T B e ij in g . B e IJ 11 9 10 0 0 8 3 , C h i n a A B S T R A C T T h e r e a e t i v e e h ar a e t e ir s t i e s o f m u lt i 一 e o m P o n e n t ht e rm it , N IO 一 A I , w e er s ut d i e d i n d e at il b y ht e mr a l an a l y t i e a l t e e hn iq u e . T h e o f C心 3 p l盯 an im p o artn t r o l e i n ht e ht e mr it r e a c t i o n an d e fe c t o n r e a e t i o n P r o du e t s . K E Y W O R D S ht e mr it , r e a e t i v e c h ar e t e ir s t i e s , g a s iif e a t i o n F e Z 0 3 一 C旧 3 ht e mr a l Por P e rt i e s ht e e o m P o s i t i o n o f