Iron based rare earth permanent magnet and its manufacturing method

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PROBLEM TO BE SOLVED : To increase corrosion resistance of an iron-base rare earth permanent magnet. SOLUTION : The iron-based rare earth permanent magnet is formed of nanocrystal whose mean particle diameter is 300 nm or smaller in its hard magnetic phase. Its composition formula is expressed as (Fe1-nCon)100-x-y-z-k-l-mNikQxRyCrzTilMm(Q is an element which is selected from a group composed of B and C; R is at least one type of rare-earth element; M is at least one type of element which is selected from a group composed of Zr, Mo, Cu, Zn, Sn, Pb, In, Nb, Hf, Ta and W). The composition ratios x, y, z, k, l, m and n satisfy relations of : 4≤x≤14 atomic%, 5≤y≤9 atomic%, 4≤z≤10 atomic%, 0.5≤k≤5 atomic%, 3.5≤l≤8 atomic%, 0≤m≤5 atomic% and 0≤n≤1. COPYRIGHT : (C)2008, JPO&INPIT