| 摘要 |
<p>Disclosed is a method for producing a raw material alloy for R-T-Q rare earth magnets. In this method, there is firstly prepared a melt of an R-T-Q rare earth alloy (with R representing a rare earth element, T representing a transition metal element and Q representing at least one element selected from the group consisting of B, C, N, Al, Si and P) which contains, as the rare earth element (R), at least one element (RL) selected from the group consisting of Nd, Pr, Y, La, Ce, Pr, Sm, Eu, Gd, Er, Tm, Yb and Lu and at least one element (RH) selected from the group consisting of Dy, Tb and Ho. Then, there are performed a first cooling step wherein a solidified alloy is formed by rapidly cooling the alloy melt to a temperature not less than 700˚C and not more than 1000˚C, a temperature maintaining step wherein the solidified alloy is kept at a temperature within the range between 700˚C and 900˚C for not less than 15 seconds and not more than 600 seconds, and a second cooling step wherein the solidified alloy is cooled to a temperature not more than 400˚C.</p> |
