| Title |
Research Paper - Environment - : Effect of Cr , Al and La on High Temperature Oxidation Kinetics in Melt Spun Fe - Cr - Al - La Alloy Ribbons |
| Authors |
신용창(Yong Chang Shin); 이기선(Kee Sun Lee); 오규환(Kyu Hwan Oh); 박원욱(Won Wook Park); 나형용(Hyung Yong Ra) |
| Abstract |
Fe-(20∼25)Cr-(5∼10)Al-xLa alloy ribbons were fabricated by PFC(Planar Flow Casting). Oxidation kinetics of the alloys were investigated. With increasing La content, activation energy for forming the protective Al₂O₃layer on the ribbon surface was increased and Al depletion rate in metal substrate was reduced. With increasing Al content, the oxidation duration time was increased. But activation energy remained constant. Increase in Cr content has no relation for the formation of Cr₂O₃ oxide, but increases the activation energy for forming a protective Al₂O₃layer. Cr₂O₃ oxide formed in Al₂O₃layer at the end of oxidation second stage broke the previous Al₂O₃layer. It is due to the elastic coherency strain energy induced by the volume difference of between Cr₂O₃ and Al₂O₃. The formation of Cr₂O₃ crystal gave rise to breakaway oxidation. The increase of Cr and Al content improves the oxidation resistance |