| 摘要 |
PURPOSE:To obtain a permanent magnet alloy having high reliability by limiting a composition consisting of a rare earth element, B, Cr, Co and Fe so as to change the magnetic hardening mechanism and to improve the temp. characteristics. CONSTITUTION:This permanent magnet alloy consists of, by atom, 9-30% R (R is at least one kind of rare earth element including Y), 5-25% B, 9-20% Cr, 10-30% Co and the balance Fe with inevitable impurities. The permanent magnet alloy has high reliability because it is obtd. by simultaneously adding Co and Cr to a rare earth element-iron type permanent magnet alloy so as to change the magnetic hardening mechanism and to improve the temp. characteristics. An alloy obtd. by melting said prescribed elements is pulverized, the resulting alloy powder is oriented in a magnetic field, compacted and sintered, and the sintered body is subjected to soln. heat treatment at a high temp. of about 950-1,100 deg.C and aging at a low temp. of about 550-800 deg.C to form a fine precipitated phase. Thus, the permanent magnet alloy having high reliability is manufactured. |
