Abstract
In this paper, a single phase ε-Fe(Si)3N powder was successfully synthesized through the salt bath nitriding reaction method. The flaky FeSi alloy powder was used as the iron source, and non-toxic CO(NH2)2 was used as the nitrogen source. The nitridation mechanism, the preparation technology, the soft magnetic properties, and the magnetization temperature dependence of the powder were studied. The research result showed that ε-Fe(Si)3N alloy powders were synthesized in a high temperature nitrification system after the surface of flaky FeSi alloy powders were activated by a high-energy ball mill. The optimum nitriding process was nitridation for 1 h at 550 °C. The ε-Fe(Si)3N powder had good thermal stability at less than 478.8 °C. It was shown that ε-Fe(Si)3N powder has good soft magnetic properties, and the saturation magnetization of the powder was up to 139 emu/g. The saturation magnetization of ε-Fe(Si)3N powder remains basically constant in the temperature range of 300–400 K. In the temperature range of 400–600 K, the saturation magnetization decreases slightly with the increase of temperature, indicating that the magnetic ε-Fe(Si)3N powder has good magnetization temperature dependence.
Highlights
On, nitrogen was introduced into iron-based materials
The master alloy was milled by high-energy vibration ball milling and the flaky FeSi alloy powder, with a sheet width of 75–150 μm and 45–75 μm, was obtained by sieving
When the temperature rises to 317 K, the saturation magnetization increases to 140.18 emu/g
Summary
Nitrogen was introduced into iron-based materials. Its main purpose was to improve corrosion resistance and the mechanical properties of materials, such as surface hardness, wear resistance, fatigue strength, etc. [1,2,3]. Lian et al and Ren et al used pure Fe powder as an iron source and got ε-Fe3 N [13,14] using the solid-gas nitriding method They held it for 3–7 h under certain temperature conditions and cooled it with liquid nitrogen or natural cooling. It is evident that the existing Fe3 N powder preparation technology has problems, such as a long nitriding time, a complicated process, high equipment requirements, and low efficiency. The ε-Fe(Si) N powder, with excellent magneto-caloric effects and soft magnetic properties, was successfully synthesized using a rapid and efficient nitriding method with a controlled treatment process. Fe(Si) N powders with excellent soft magnetic properties and temperature dependence were successfully prepared by controlling the nitriding process to achieve a fast and efficient nitriding method. The Si element increases the entropy values of the powder and reduces the difficulty of the nitriding reaction
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