Preparation of Rapidly Quenching ( Nd, Pr)12 ( Fecozr)82 B6 Alloy and Magnetic Properties of Bonded Magnetsξ
http://www.paper.edu.cn J OURNAL O F RAR E EARTHS Vol . 22 , No. 4 , Aug. 2004 , p. 497 Preparation of Rapidly Quenching ( Nd , Pr) 12 ( FeCoZr) 82 B6 Alloy and X Magnetic Properties of Bonded Magnets Zha Wusheng (查五生) 1 ,2 , Liu Ying (刘 颖) 1 3 , Gao Shengji (高升吉) 1 , Tu Mingjing (涂铭旌) 1 ( 1. College of Material Science & Engineering , Sichuan University , Chengdu 610065 , China ; 2. College of Material Science & Engineering , Xihua University , Chengdu 610039 , China) Abstract : The optimum quenching rates and annealing conditions to prepare near stoichiometrical (Nd ,Pr) 12 (FeCoZr) 82B6 bonded magnets were investigated by using sub2overquenching and post annealing method. The quenching rates , annealing temperatures , and annealing time directly influence the microstructure and magnetic properties of alloy ribbons. The opti2 mum magnetic properties of bonded magnets are achieved by melt spinning at 24 m·s - 1 wheel surface speed , annealing at 655 ℃for 10 min , and bonding with 3. 25 % (mass fraction) epoxy. The best magnetic properties of remanence B r , in2 - 1 - 3 trinsic coercivity Hci and maximum energy product ( B H) max are 0. 669 T , 811 kA·m , and 75 kJ ·m , respectively. Key words : metal materials ; permanent magnet ; Pr2based bonded magnets ; melt spinning ; magnetic properties ; rare earths CLC number : TM273 Document code : A Article ID : 1002 - 0721( 2004) 04 - 0497 - 04 The anisotropy field HA of Pr2Fe14B is about 30 % with excellent properties were prepared. higher than that of Nd2Fe14B which results in high in2 trinsic coercivity for nanocrystalline exchange coupled 1 Experimental composite permanent magnets. So the Pr2based The ingot of (Nd , Pr) 12 ( FeCoZr) 82B6 alloy was isotropic bonded magnets have currently attracted prepared by induction melting the commercial grade much attentions[1~4 ].
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