Manufacture of permanent magnet

Abstract

Abstract PURPOSE:To increase coercive force and to improve characteristics for forming square hypteresis loop of an intermetallic compd. of rare earth metals given by a specified composition formula by first subjecting the intermetallic compd. of rare earth metals to solution heat-treatment in its alloy ingot state under a specified condition and then applying aging treatment to it. CONSTITUTION:An intermetallic compd. of rare earth metals, given by the formula R (CO1-u-v-wCuuFevMw)z where 0.01<=u<=0.2, 0.1<=v<=0.5, 0.001<=w<=0.15 and 6.5<=z<=9.0, is first subjected to solution heat-treatment in its alloy ingot state. It is then subjected to aging treatment for magnetic hardening. Here, R is one of rare earth metals Sm, Y, Ce and Pr or a combination of more than two kinds of them, while M is one of Ti, Ta, Hf, Zr, V, Nb, Cr and Mo or a combination of more than two kinds of these metals. The conditions of the solution heat-treatment are specified as follows: A heating temperature of 1,100-1,230 deg.C and a heating retention period of more than 10hr at the least.

Inventors

• 👤 Itaru Okonogi
• 👤 格 小此木
• 👤 Tatsuya Shimoda
• 👤 達也 下田
• 👤 Katsuhiro Teraishi
• 👤 寺石　克弘

Bibliographic Details