| 摘要 |
PURPOSE:To make control of particle size easy and to prevent the welding of powder after treatment by using main components of R(T, M) (wherein, R is a rare earth element, T is Fe or a transition metal element represented mainly by FeCo and M is a semimetal element represented mainly by B.) CONSTITUTION:Two alloys, A, B wherein the compositions are given with A; R(T1-xMx)y and B; R(T1-xMx)z and x, y, z is defined as 0.01<=x<=0.2, 4<=y<=9, 1<=z<=3 respectively are used as raw materials. These two alloys are formed into an ingot by vacuum induced dissolution or Ar arc dissolution, the alloys A, B are mixed at the ratio of A 90-99.5wt% and B 0.5-10wt% respectively and are ground to 2-200mum particles. Then, the fine mixed powder is stirred and heated at 600-1,000 deg.C, the particles of the component B are welded and diffused on the surfaces of the particles of the alloy A preventing the mutual sintering of the particles of the main component alloy A, a destructed alloy A phase is reproduced, a surface layer is given a texture which has higher concentration of rare earth elements than the alloy A phase, then mixed with a resin, etc. and a permanent magnet material is obtained. |
