Optimizing the Heat Treatment of Rare Earth-Transition Metal Sintered Magnets
Rare earth transition metals magnets, as for example SmCo5, NdFeB and Sm(CoCuFeZr)z magnets are, very often, submitted to a post-sintering heat treatment where the coercivity increases. In many cases, a slow cooling between the sintering and the annealing temperatures is applied. To optimize the time and cooling rate of heat treatment, it was developed a model using the finite volume method. This model takes into account the diffusivities of the different atom species and also the boundaries of phase diagrams.
Lucio Salgado and Francisco Ambrozio Filho
M. F. de Campos and J. A. de Castro, "Optimizing the Heat Treatment of Rare Earth-Transition Metal Sintered Magnets", Materials Science Forum, Vols. 660-661, pp. 290-295, 2010