2001 Volume 48 Issue 8 Pages 753-757
The oxidation stability and structure of acicular fine Fe-Co particles have been investigated. The oxidation stability in the high temperature range is improved with the increase of Co content in the metal particles. It is observed that the shape of the cross section of Fe metal particles without Cc is distorted and the surface oxide layer shows diffuse diffraction spots. On the contrary the shape of the cross section of Fe-Co particles is approximately circular and the surface oxide grows to be coherent with the core α-Fe suggesting that the amount of the defects of the surface oxide layer reduces. Based on these results, it is found that the improvement of the oxidation stability by addition of Co is attributed to the morphology of the particles and the structure of the surface oxide layer around the core α-Fe. The oxidation stability also depends on the size of metal particles.
