Sintered Nd-Fe-B magnets have been widely used due to their excellent magnetic properties, especially for driving motors of hybrid and electric vehicles. The microstructure of Nd-Fe-B magnets strongly affects their magnetic properties, in particular the coercivity. Therefore, a post-sintering process like heat-treatment is required for improving the magnetic properties of Nd-Fe-B sintered magnets. In this study, cyclic heat treatment was performed at temperatures between 350 o C and 450 o C up to 16 cycles in order to control microstructures such as size and shape of the Nd-rich phase without grain growth of the Nd 2 Fe 14 B phase. The 2 cycles specimen at this temperature range showed more homogeneous microstructure which leads to higher coercivity of 35 kOe than as-sintered one.
The magnetic property of Nd 23 Dy 10 Fe 64 TM 2 B 1 alloy was investigated by the convergent heat treatment at 350 to 450°C with the heating/cooling rate of 10°C
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