MANUFACTURING METHOD OF IRON-BASED ALLOY FINE POWDER CONTAINING RARE EARTH ELEMENT

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PROBLEM TO BE SOLVED : To provide a method for manufacturing an iron-based alloy fine powder containing a rare earth element, having reduced variation of coercivity or weather resistance and stably exhibiting high coercivity and excellent weather resistance.SOLUTION : The manufacturing method of an iron-based alloy fine powder containing a rare earth element has a first process for pulverizing an iron-based alloy powder containing the rare earth element in a solvent containing an organic solvent and adding a phosphoric acid compound during the pulverizing to obtain a fine powder of which a surface is coated by a phosphate coating film and a second process for conducting a heat treatment on the resulting fine powder at a predetermined temperature. In the second process, the heat treatment is conducted under a temperature condition of 100°C to 300°C in atmosphere containing hydrocarbon having an unsaturated bond in a molecule so that hydrogen content of the resulting iron-based alloy fine powder is 0.2 mass% or less.SELECTED DRAWING : NoneCOPYRIGHT : (C)2017, JPO&INPIT