Transactions of Nonferrous Metals Society of China
JOURNAL OF RAILWAY SCIENCE AND ENGINEERING
|Vol. 12 No. 4 August 2002|
（Institute of Materials Science and Engineering, Shanghai University,
Shanghai 200072, China）
Abstract:Nd8.5Fe75Co5Cu1Zr3Nb1B6.5 bonded magnet was prepared by melt-spinning (vs=18m/s) and subsequent heat treatment (670℃, 4min). Excellent magnetic properties of the bonded magnet were achieved: Br=0.68T, iHc=620.3kA/m, (BH)max=74kJ/m3. The addition of Cu and Zr elements shows to be advantageous in improving an intrinsic coercivity and squareness of hysteresis loop, as well as energy product. It has a remarkable remanence enhancement and the isotropic saturation remanence ratio Mr/Ms is 0.83.
Key words: Nd-Fe-B；permanent magnet；nanocrystalline；grain size