| 简介 |
[Problem]We will provide a method for producing R-T-B-based sintered magnets that do not require paving powder in the process of diffusing heavy rare earth elements from diffusion sources to sintered bodies. [Solution Method]The method for producing the R-T-B sintered magnet disclosed herein includes a process of preparing an R-T-B-based sintered magnet material, preparing a diffusion source powder formed from a powder of an alloy containing the heavy rare earth element RH, a process of contacting the diffusion source powder on at least the upper and lower surfaces of the R-T-B sintered magnet material, and a process of placing the R-T-B sintered magnet material in a state in which the diffusion source powder is in contact on the support plate; Heat treatment is performed on the R-T-B sintered magnet material placed on the support plate, and includes a diffusion step for diffusing the heavy rare earth element RH contained in the diffusion source powder, and the support plate is at least one first layer selected from the group mgO, Al 2 O 3, MgAl 2 O 4, CaAlO 3 and NdAlO 3 in order from the top surface, at least on the upper surface, A second layer comprising a 1st stone crystallized at 700 ° C. or higher is provided. [Selection Figure]Figure 5 |
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