Patent ID: 7585378

Claim:
A method of making a material alloy for an R-T-Q based rare-earth magnet, the method comprising the steps of: (a) preparing a melt of an R-T-Q based rare-earth alloy, where R is rare-earth elements, T is a transition metal element, Q is at least one element selected from the group consisting of B, C, N, Al, Si and P, and the rare-earth elements R include at least one element R L 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 R H selected from the group consisting of Dy, Tb and Ho; (b) cooling the melt of the alloy to a temperature of 700° C. to 1,000° C. as first cooling process, thereby making a solidified alloy; (c) maintaining the solidified alloy at a temperature within the range of 700° C. to 900° C. for 15 seconds to 600 seconds; and (d) cooling the solidified alloy of step (c) to a temperature of 400° C. or less as a second cooling process.