Abstract
The characteristics of the magnetic properties nanocomposite Nd 2(Fe,Co,M) 14B/α-Fe magnets obtained by high energy ball milling and powder metallurgy routes have been improved by appropriate Al–Cr, Cr, Zr additions. Using a single phase close to the stoichiometric composition, nanocomposite Nd 12.6(Fe,Co,M) 81.4B 6/α-Fe magnets with better temperature stability are produced, due to the disappearance of the Nd-rich grain boundary phase in Nd 2(Fe,Co) 14B/α-Fe materials. If the content of the soft magnetic α-Fe phase in Nd 2(Fe,Co,M) 14B/α-Fe composities increases, the thermal stability of the coercivity increases, too. For a Nd 12.6Fe 69.3Co 11.6Zr 0.5B 6/α-Fe magnet, containing 37.5 vol% α-Fe, the temperature coefficients (from 293 to 413 K) of remanence α( J r) and coercivity β( J H c) are: −0.07 and −0.35% K −1, respectively. Nanocomposite magnets appears to be more corrosion resistant than sintered Nd–Fe–B magnets.
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