Microstructure and Magnetic Property of Sm_2Fe_(17) Nanopowder Synthesized by Modified Reduction-Diffusion Process

摘要

A modified reduction-diffusion (MRD) process at low temperature was performed on the microstructure and magnetic property of a base alloy nanopowder of Sm_2Fe_(17) for high performance Sm_2Fe_(17)N_3 magnetic materials. The Sm_2Fe_(17) nanopowder with a particle size distribution of 100-500 nm was synthesized by MRD process at 700°C. The measurement of magnetic property revealed that the Sm_2Fe_(17) nanopowders had a saturation magnetization (M_s) of 128 A-m2/kg and a high coerciviry (H_c) of 91.8 kA/m. It is expected that the magnetic property of Sm_2Fe_(17) nanopowder provides a superior base alloy material for fabricating high performance Sm_2Fe_(17)N_3 magnetic materials by subsequent nitriding treatment.