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Oxidation Resistance and Magnetic Properties of SmCo7−x Si x Permanent Magnetic Alloys

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Abstract

The crystal structure, oxidation resistance, and magnetic properties of SmCo7−x Si x (x=0, 0.4, 0.6, and 0.9) permanent magnetic alloys were investigated systematically. It is found that the addition of silicon in the as-cast SmCo7 ingot plays an important role in stabilizing TbCu7 phase and improving inherent oxidation resistance. For the bulk nanocrystalline SmCo7−x Si x magnets, the oxidation resistance remarkably enhances but the corresponding Curie temperature T c and maximum energy product (BH)max exhibit a decreasing trend with the increase in Si content x. For the typical SmCo6.4Si0.6 nanocrystalline magnet, its final mass gain was about 1.71 mg/cm2 after oxidation at 500 °C for 100 h, indicating the enhanced inherent oxidation resistance. Its T c and (BH)max were about 708 °C and 35.4 kJ/m3, respectively.

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  1. Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, Beijing, 100191, People’s Republic of China

    Lili Liu & Chengbao Jiang

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  1. Lili Liu
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  2. Chengbao Jiang
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Correspondence to Chengbao Jiang.

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Liu, L., Jiang, C. Oxidation Resistance and Magnetic Properties of SmCo7−x Si x Permanent Magnetic Alloys. J Supercond Nov Magn 25, 131–135 (2012). https://doi.org/10.1007/s10948-011-1276-4

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  • DOI: https://doi.org/10.1007/s10948-011-1276-4

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