| 摘要 |
PURPOSE:To reduce the irreversible demagnetization of an Nd-Fe-B magnet and, at the same time, to minimize the deterioration of the maximum energy product of the magnet. CONSTITUTION:This magnet is manufactured in such a way that a first component powder composed mainly of an Nd2Fe14B (where, the Nd and B contents are respectively controlled to 11.8-20.0at.% and 5.9-20.0at.%) intermetallic compound is mixed with a second compound powder composed mainly of one or two kinds of R(Cu1-XTX) and R(Cu1-XTX)2 (where, R, T, and x respectively represent rare-earth elements containing Dy and Tb by >=30%, one kind or a mixture of two or more kinds of transition metals or metalloid (such as Fe, Co, Ni, Al, Ga, Ti, Mo, V, Sn, B, P, Si, etc., and 0.3-0.7) and the mixture is molded in a magnetic field, and then, the molded product is subjected to liquid-phase sintering. Therefore, part of the Nd near the surface of the main phase, namely, the Nd2Fe14B intermetallic compound is replaced with Dy and Tb and the occurrence of an inverse magnetic domain in the vicinity of the surface can be suppressed. |
