The preparation, oxidation resistance and magnetic properties of Co2FeAl@C core-shell nanoparticles

Co₂FeAl@C nanoparticles were prepared by co-precipitation and annealed in a gas mixture. Firstly, the effects of annealing temperature on the structure and magnetic properties of Co₂FeAl@C nanoparticles were studied. Subsequently, the oxidation resistance of Co₂FeAl@C nanoparticles was explored. When the annealing temperature was 400 °C, carbon-coated pure Co₂FeAl alloy nanoparticles were prepared. With the increasing of annealing temperature, crystallization degree, grain size and saturation magnetization of Co₂FeAl@C nanoparticles increased gradually. When the annealing temperature was 800 °C, the saturation magnetization of Co₂FeAl@C nanoparticles reached a maximum value (149.6 emu/g). These Co₂FeAl@C nanoparticles with good oxidation resistance have great potential in some industrial fields.