Abstract
High coercivity magnets were prepared by further grain boundary diffusion of the hot-deformed magnets after diffusion of the dual-alloy, and their structure and magnetic properties were studied. When addition of Pr-Ga of the dual-alloy diffusion is 11 wt%, the coercivity of the subsequent magnet diffusing through the grain boundary is 29.81 kOe. The results show that the grain boundary widening caused by dual-alloy diffusion is beneficial to the subsequent grain boundary diffusion process. In addition, the microstructure shows that Ga content can inhibit the increase of oxygen content in the grain boundary to a certain extent, which provides a new idea for solving the problem of oxidation when preparing fine crystal magnets in the future.
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