R-T-B BASED SINTERED MAGNET

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PROBLEM TO BE SOLVED : To provide a low oxygen R-T-B based sintered magnet having an ideal texture structure, having coercive force satisfying heat resistance requested of an HEV magnet in tendency to increase hereafter and reducing use of heavy rare earth elements which are rare resources as much as possible. SOLUTION : The R-T-B based sintered magnet has a main phase consisting of compound having an R2T14B-type crystal structure, and a grain boundary phase. The R-T-B based sintered magnet consists of R : 27.3 mass% to 29 mass%, X (X is at least one kind among Cu, Ag and Au) : 0.06 mass% to 0.18 mass%, B : 0.92 mass% to 1 mass%, O : not more than 0.05 mass%, and a remaining part Fe or Fe, Co and inevitable impurity. COPYRIGHT : (C)2010, JPO&INPIT