希土類元素を含む銅合金の高温酸化

概要

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A study has been made of the oxidation of copper alloys containing rare earth elements at temperatures ranging from 500℃ to 900℃. At temperatures below 800℃ except at 500℃, the oxidation resistance in air was improved by the addition of rare earth elements, but it was hardly improved at 900℃. The time at which the oxidation process of copper began to proceed according to a parabolic law was delayed by the addition of rare earth elements at every investigated temperature. The activation energy for the oxide scale formation of copper was 34.7 Kcal/mol. This value is approximately similar to the activation energy for the formation of cuprous oxide. The activation energies for the oxide scale formation of alloys containing rare earth elements were greater than that of copper. SEM photographs showed that there was a difference in appearance of surface oxide scale between copper and its alloys containing rare earth elements and that the mechanical pegging of oxide scales to matrix was noted in the alloys containing rare earth elements. Optical photographs of oxide scales also showed that the fine grained oxide scales which were formed on the matrix surface containing rare earth elements played an important role for the good adhesion of oxide scales to matrix.
社団法人日本材料学会の論文
1976-04-15