(Nd0.9DYo. l)16Co5Fe70Nb2B7 PERMANENTMAGNETIC ALLOY AND BEHAVIOUR OF Nb
(1.General Research Institute of Non-ferrous Metalr，Beijing 100088;
2.Beijing Tape Recorder Factory，Beijing 100080;
3.University of Science and Terhnology Beijing，Beijing 100083)
2.Beijing Tape Recorder Factory，Beijing 100080;
3.University of Science and Terhnology Beijing，Beijing 100083)
Abstract: The magnetic properties of (Nd0.9Dy0.1)16Co5Fe70Nb2B7 Permanent magnetic allay pre-pared by powder metallurgy are:Br=1. 08T, iHc=1 620kA/m，(BH)max=208k]/m3. The behaviour of Nb in this alloy was studied by joint methods of dynamic observation by high voltage electron micro-scope (HVEM) and Mossbauer effects. With Nb and Co substituting parts of Fe and adding a little Dy，practical magnetic alloy with excellent properties can he obtained. The thermal stability of it is 80℃ higher than that of ternary Nd-Fe-B magnet. The study shows that adding Nh into Vd-Fe-B can make the intrinsic coercivity appear peak value at about Nb = 2%(in mole fraction)Nb mainly enters intoNd-rich and B-rich phases，a little into Nd2Fe14B phase.
Key words: (Nd0.9Dy0.1)16Co5Fe70Nb2B7, permanent magnetic allay magnetic properties