Microstructure and magnetic properties of two-phase nanocomposite ND_9Fe_(85.5)Nb_(1.0)B_(4.5-y)C_y(y chemical bounds 0.5-4.5) magnets

摘要

Nd_2Fe_(14)C is hopefully develoed into a new rare-earth permanent magnet as it possesses a high room temperature magnetorcrystalline anisotropy ( #mu# _0H_a chemical bounds 9.5 T), high saturation magnetization (M_s chemical bounds 1.50 T) and high ideal energy product (BH)_(max) chemical bounds 56.2 MGOe [1]. In past years, many investigations were foucsed on the microstructure and mangetic properties of Nd_2Fe_(14)C ingot formed by arc-melting method and post a long time heat treatment [2-3]. Recently, the studie on ball milling Nd_2Fe_(14)C were reportd [4]. However, relatively littel is known about producing Nd_2Fe_(14)C and Nd_2Fe_(14)C/ #alpha# -Fe nanocomposite magnets by melt-spun method. Moreover, two phase nanocomposite magnets have received considerable attention for they have a very high theoretical energy (BH)_(max) approx 120 MGOe and a low expense of rare earth, which mnay make a low cost for industrial manufacture [5]. It is very useful to study Nd_2Fe_(14)C/ #alpha# -Fe nanocomposite materials based on both scientific research and practical application. The aim of the present work is producing two-phase nanocomposite exchange-coupled magnets with a high energy product.