High-temperature oxidation resistance and magnetic properties of Si-doped Sm2Co17-type magnets at 500 °C

► The addition of Si in the Sm2Co17-type magnet can improve its oxidation resistance. ► A small amount of Si addition can increase high-temperature intrinsic coercivity. ► A maximum intrinsic coercivity of 6.7 kOe at 500 °C was obtained. ► A low temperature coefficient of coercivity β about −0.05%/°C was obtained. ► Si0.4-doped magnet possesses good oxidation resistance and magnetic performance.