Preparation and magnetic properties of melt-spinning Nd2Fe14B alpha-Fe nanocomposite magnets

作者：Wang W; Ni JS^*; Xu H; Zhou BX; Li Q; Wang ZY

来源：Journal of Rare Earths, 2004, 22(4): 505-508.

• nanocomposite magnets
• melt spinning
• exchange coupling
• rare earths

Nd11Fe71Co8V1.5Cr1B7.5 magnet was prepared by melt-spinning and subsequently annealed. The effects of the wheel speed on the magnetic properties and microstructure were studied. The results reveal that fine nanocomposite microstructure consisting of Nd2Fe14B and alpha-Fe phases can be developed at an optimum wheel speed of about 21 m(.)s(-1). After optimal annealing (640 degreesC x 4 min), magnetic properties of B-r=0.64 T, H-j(c) = 903.5 kA(.)m(-1) and (BH)(max) = 71 kJ(.)m(-3) were obtained for the bonded magnets. The addition of Cr element significantly reduces grain size, increasing the intrinsic coercivity and maximum magnetic energy product.

• 出版日期2004-8
• 单位上海大学