| 摘要 |
PURPOSE:To improve the corrosion resistance of a permanent magnet by sintering a powder molding which contains alloy powder obtained by R2T14B phase crystalline alloy powder (R is rare earth elements including Y, T is transition metal) obtained by R-Fe-M or R-Fe-M-B (M is one or more types of Co, Ni, Cu, Pb and Sn) liquid- quenched alloy powder or strip (amorphous and fine crystal) in R2T14B phase crystalline alloy powder (R is rare earth elements including Y, T is transition metal). CONSTITUTION:When R2T14B alloy magnet (R is Rare earth elements, T is transition metal) which contains as main ingredients R, Fe and B is manufactured by a powder metallurgical method, a powder molding which contains 5-30vol.% of alloy powder obtained by R-Fe-M or R-Fe-M-B (M is one or more types of Co, Ni, Cu, Pb and Sn) liquid-quenched alloy powder or strip (amorphous and fine crystal) in R2T14B phase crystalline alloy powder is sintered. Thus, since the R-Fe-M or R-Fe-M-B powder improved in its corrosion resistance is used for the powder which becomes nuclei of the liquid phase at the time of sintering and main ingredient of liquid phase, R-Fe solid solution in the sinter texture obtained after sintering becomes R-(Fe-M) solid solution to improve its corrosion resistance. |
