| 摘要 |
PURPOSE:To enhance coersive force of residual magnetic flux density, make large the maximum energy product and ensure good temperature coefficient of residual magnetic flux density by forming a permanent magnet using a material mainly composed of particular rare earth elements and ion. CONSTITUTION:As a material of permanent magnet, the composition expressed by R1-alpha-beta-gammaFealphaMbetaXgammais used. Here, R is one or two or more kinds of rare earth element and M is one or two or more kinds of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W. X is one or two or more kinds of B, C, N, Si, P and the values of alpha, beta, gamma satisfy the relation, 0.60<=alpha<=0.85, 0.01<=beta<=0.10, gamma<=0.15. For example, an alloy having the composition of Nd0.17-betaFe0.75TibetaB0.08 is fused under the Ar ambient within a button dissolution furnace and is smashed into fine powder with a jet mill until the average grain size becomes 5mum. Next, this powder is press-molded under the magnetic field of 15kOe and is then sintered for an hour under the Ar ambient at a temperature of 1,000 deg.C. |
