The effect of hydrogen atmosphere sintering in manufacturing (Sm,Zr)(Со,Cu,Fe)Z-based permanent magnets on their properties has been studied. It is shown that sintering in hydrogen, in comparison with sintering in argon, allows obtaining a higher density of billets, while reducing the optimal sintering temperature range by 20 °C. To achieve the same levels of intrinsic coercivity, hydrogen sintered samples require 1.5 times less time of isothermal aging, at the same temperature of heat treatment. In the end, (Sm,Zr)(Со,Cu,Fe)Z-based permanent magnets of standard chemical composition sintered in a hydrogen atmosphere, in comparison with sintered in argon, are characterized by higher hysteresis performances: remanence, induction coercivity, intrinsic coercivity and static energy product.Keywords: Rare earth permanent magnets, hydrogen sintering, heat treatment, coercive force
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