| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rare-earth-iron-based magnet powder for a bond magnet, which is superior in the moldability of a composition prepared from the powder for the bond magnet, and in mechanical strength of the bond magnet, and to provide a production method therefor. <P>SOLUTION: The rare-earth-iron-based magnet powder has a film containing Fe, P, O and RE (RE is a rare earth element) with a film thickness of 100 nm or less on its surface. The amount of Fe which exists in the film in a metallic state is 2.0% or less when the amount is determined by measuring Fe2p<SB>3/2</SB>spectrum on the surface of the magnet powder with an X-ray photoelectron spectroscopy apparatus and then calculating the amount based on the area of the obtained spectrum profile. The film is formed by bringing the magnet powder into contact with a treatment liquid containing phosphoric acid, and then heating and drying the wet film at a particular temperature. The amount of Fe in the metallic state is reduced by the operation of repeating the treatment of contacting phosphoric acid and the heating and drying treatment. <P>COPYRIGHT: (C)2011,JPO&INPIT |
