| 摘要 |
PURPOSE:To decrease the reduction rate of the maximum energy product at a high temperature by making the density of specific metals high in the peripheral part of the crystal particle constituting a magnet and low in the central part. CONSTITUTION:An alloy powder I composed of Nd, R, Fe, M and B and an alloy powder II composed of a composition formula Nd2Fe14B and having a sintering temperature higher than the alloy powder I are prepared, and when a mixture of the alloy powder I and the alloy powder II is formed in a magnetic field and sintered, a crystal will grow with Nd2Fe14B being a kernel, and the density of R and M becomes low in the central part of the crystal and high in the peripheral part. With this, a magnet is easily obtained which has a large maximum energy product and causes no substantial reduction of the maximum energy product at a high temperature. Incidentally, R is at least one rare earth element of La, Ce, Pr, Dy, Ho and Tb, and M is at least one metal element of Al, Ti, V, Cr, Mn, Co, Ni, Zr, Nb, Mo, Ta and W. |
