| 摘要 |
PURPOSE:To obtain a product contg. remaining Ca and C in a smaller amt. and having an excellent magnetic characteristic and stability with a direct reduction diffusion method for the permanent magnet alloy powder consisting of a Cu substd. type multi-element rare earth intermetallic compd. by using an acid for cleaning the resultant product of reduction diffusion reaction. CONSTITUTION:The permanent magnet alloy powder of the compsn. expressed by the formula (R is >=1 kind among rare earth metals including mainly Sm, Ce and Pr, M is >=1 kind among Si, Ti, Zr, Mn, V, Nb, Cr, Mo, Hf, 0.01<=x<=0.40, 0.02<=y<=0.25, 0.001<=z<=0.15, 5.0<=A<=8.0) is produced by a reduction diffusion method with rare earth oxide as a raw material. The resultant product of the reduction diffusion reaction is cleaned in an acidic aq. soln. having 2-5pH and is then neutralized by washing and dried. The dried product is subjected to wet pulverizing to form the powder which has 2-5mu average grain size and of which the contents of Ca and C as impurities during pulverization are maintained respectively at <=0.2wt%. |
