ScholarWorks@숙명여자대학교

초록

Ce-Fe-B magnets with a medium performance between that of Nd-Fe-B magnets and ferrite magnets were prepared using a hot deformation process. To improve the grain orientation and magnetic properties of Ce-Fe-B hot-deformed magnets, a doping process with an Nd-Cu eutectic alloy was employed. As a result, the coercivity was enhanced from 0.37 to 1.86 kOe by 10 wt.% Nd-Cu doping due to the formation of a distinct grain boundary phases. Despite doping with nonmagnetic Nd-Cu, the remanence increased significantly from 4.45 to 9.31 kG by 10 wt.% Nd-Cu doping because of the improved grain alignment and increasing the saturation magnetization caused by changes in the composition of matrix phases. Microstructural observations revealed that the formation of Ce(Fe,Co)2 granules several tens to hundreds of nanometers in size inside the ribbon flakes was suppressed by Nd-Cu doping, and instead, rare-earth (RE)-rich phases were formed at the grain boundaries and ribbon flake interfaces.

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