RARE EARTH, IRON, BORON ALLOY POWDER FOR PERMANENT MAGNET

摘要

PURPOSE:To obtain homogeneous and single phase alloy for magnet by consisting main constituents of 8-30atom% R (at least one of rare earth elements including Y), 2-28atom% B and 65-82atom% Fe. CONSTITUTION:Main constituents consist of 8-30atom% R, 2-28atom% B and 65-82atom% Fe (including part of Fe substituted by at least one of Co which is 50% or less of Fe and Ni which is 8.0% or less of Fe). The main phase is tetragon, diameter of the mean crystal grain is 30mum or more, the mean grain size is 0.3-80mum and actually consists of single crystal. For this reason, extremely homogeneous and single phase alloy which is excellent in oxidization proof and corrosion proof for magnet can be obtained and the yield is improved.