High anisotropy in Pr-Fe-Co-B-ZrHDDR powders

The magnetic behaviour of HDDR powders prepared from a Pr13.7Fe63.5Co16.7B6 Zr0.1 alloy has been investigated. It has been shown that it is possible to produce highly anisotropic HDDR material from this alloy in the homogenise d state (1373 K for 20 h). Remanent magnetisation in the easy direction of the aligned powder was 126+/-2 J/Tkg whereas, in the hard direction, it was 30+/-0.6 J/Tkg. HDDR powder based on the corresponding Nd-based alloy (sub jected to the same heat treatments) and commercially available, HDDR powder , have both been used as a comparison. The degree of alignment for the HDDR powder based on the Pr alloy was higher (76%) than that of the commercial HDDR powder (69%). (C) 1999 Elsevier Science S.A. All rights reserved.