Abstract
The high-temperature oxidation resistance and magnetic properties of Si-doped Sm2Co17-type magnets at 500°C were systematically investigated. The Sm(Co0.76, Fe0.1, Cu0.1, Zr0.04)7Six (x=0–0.6) magnets were prepared by the conventional powder metallurgical technique. It is found that the addition of silicon in the Sm2Co17-type magnet can remarkably improve its oxidation resistance. Moreover, a small amount of silicon addition can also increase its high-temperature intrinsic coercivity. A maximum intrinsic coercivity of 6.7kOe at 500°C was obtained for the Sm2Co17-type magnet with Si content x=0.4, whose high-temperature maximum energy product loss was about 2.5 times smaller than pure Sm2Co17-type magnet after oxidation at 500°C for 100h, indicating the enhanced oxidation resistance. Its corresponding Curie temperature and saturation magnetization are about 723.9°C and 7.4kG, respectively.
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