Abstract
Sm2Co17-type sintered magnets have attracted widespread attention for their excellent magnetic properties and thermal stability. The magnetic properties largely depend on the cellular structure and Cu, Fe distributions within these magnets. This paper systematically studies the effect of magnetic field heat treatment (MFHT) on the magnetic properties and microstructure of Sm2Co17-type sintered magnets. MFHT improves the room-temperature magnetic properties and remanence temperature stability of magnets but slightly deteriorates the temperature coefficient of intrinsic coercivity. A microstructure analysis shows that MFHT improves the cell boundary phase content and optimizes the cellular structure and Cu, Fe distributions of magnets. A high-density short lamellar phase, possibly induced by MFHT, provides easy diffusion paths for Cu and Fe, thereby improving the magnetic properties of magnets. Compared with conventional aging treatment, this paper proposes a promising method to improve the magnetic properties of Sm2Co17-type sintered magnets under the same heat treatment time and temperature.
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