Notice of Removal: Study on Oxidation Process of Sm(Co0.6Cu0.08Fe0.3Zr0.02)8.35 Magnetic Powders

In the atmosphere, R ₂ Co ₁₇ -type SmCo-based magnetic powders (Sm(Co _0.6 Cu _0.08 Fe _0.3 Zr _0.02 ) _8.35 ) a bit different in oxidation process as compared with bulk permanent magnet. This article describes investigation of the oxidation process of Sm(Co _0.6 Cu _0.08 Fe _0.3 Zr _0.02 ) _8.35 magnetic powders at up to 500 °C through thermogravimetric/differential thermal analysis (TG/DTA) and X-ray diffraction (XRD) technology. The result shows that oxides such as CuO, Co ₃ O ₄ , and CoFe ₂ O ₄ are firstly formed at 225 °C and then Sm ₂ O ₃ at 350 °C. At this point activation energy is 47 kJ/mol.