Loading patent…
AssigneeYantai Zhenghai Magnetic Material Co., Ltd.
InventorsBuzhuang PENG, Dongdong LI, Junjia XIANG, Guodong SU, Meng XUE
Estimating the term…
A large sintered R—Fe—B magnet, a preparation method and use thereof are provided. The sintered R—Fe—B magnet has a thickness not less than 10 mm in an orientation direction. Any cross section along the orientation direction is marked as a diffusion cross-section area, and a side of the diffusion cross-section area close to the outer surface of the sintered R—Fe—B magnet is marked as the surface of the diffusion cross-section area. The difference between the coercivity of the surface of the diffusion cross-section area and the coercivity at 5 mm away from the surface of the diffusion cross-section area is ΔH, and ΔH is ≤50 kA/m.
A sintered R—Fe—B magnet, wherein the sintered R—Fe—B magnet has a thickness not less than 10 mm in an orientation direction, any cross section along the orientation direction is marked as a diffusion cross-section area and one side of the diffusion cross-section area close to the outer surface of the sintered R—Fe—B magnet is marked as the surface of the diffusion cross-section area, and the difference between the coercivity of the surface of the diffusion cross-section area and the coercivity at 5 mm away from the surface of the diffusion cross-section area is ΔH, wherein ΔH is ≤50 kA/m.
Dependencies are inferred from the claim text.