Preparation and magnetic properties of anisotropic Nd₂Fe₁₄B/Sm₂Co₁₇ hybrid-bonded magnets

Xueguo Yin^1,2，Yue Sui³，Qiqi Yang²，Qian Shen¹，Yilong Ma²，Bin Shao²，Jianchun Sun²，Donglin Guo²

1. College of Material Science and Engineering, Chongqing University of Technology2. College of Metallurgy and Materials Engineering, Chongqing University of Science and Technology3. College of Chemistry and Chemical Engineering, Chongqing University of Science and Technology

摘 要：In the present work, anisotropic Nd₂ Fe₁₄ B/Sm₂ Co₁₇ hybrid-bonded magnets were prepared with different Nd-Fe-B contents. It is found that the particle distributions and ratios between the two magnetic phases have important roles in the magnetic properties, microstructures and thermal stability of the magnets. With increase of Nd-Fe-B content, the saturation magnetization of the anisotropic hybrid magnet increases significantly, however, coercivity decreases, and the demagnetization curves show magnetically single-phase behavior. The anisotropic Nd₂ Fe₁₄ B/Sm₂ Co₁₇ hybrid-bonded magnets exhibit a maximum energy product and remanence of 14.15 MGOe and 99.53 A·m²/kg, respectively, when the NdFe-B content is 70 wt% at room temperature. Furthermore, the hybrid magnets also have better thermal stability at elevated temperatures due to the interaction between the two magnetic particles.

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