R-T-N BASED MAGNETIC POWDER AND ITS MANUFACTURING METHOD

文件类型：PDF文档
文件大小：96K
PROBLEM TO BE SOLVED : To provide high-performance R-T-N based magnetic powder which has high thermal stability and excellent weather resistance and can be oriented to a higher degree than heretofore and also to provide its manufacturing method. SOLUTION : The method for manufacturing the R-T-N based magnetic powder comprises the following steps : a step of mixing R-T-N based coarse powder (wherein, R is one or more kinds among rare earth elements including Y and necessarily contains Sm; and T is Fe or Fe and Co and contains inevitable impurities) into an organic solvent; a step of pulverizing the R-T-N based coarse powder; and a step of drying the resultant pulverized powder. The pulverization of the R-T-N based coarse powder is carried out by adding a surfactant to the organic solvent, and, in this pulverizing step, phosphoric acid is added in a stage midway through the progress of the pulverization of the R-T-N based coarse powder. COPYRIGHT : (C)2006, JPO&NCIPI