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The effect of Ni and Si additions on the oxidation behaviour of Co-17Re-18Cr alloys

机译:镍和硅的添加对Co-17Re-18Cr合金氧化行为的影响

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摘要

The present study deals with the oxidation behaviour of three Co-17Re-18Cr-XNi (X = 8, 15, 25 at.%) alloys and one Co-17Re-18Cr-15Ni-2Si alloy in the temperature range 800 degrees C-1100 degrees C. The experimental results reveal improved oxidation resistance with increasing Ni concentration. It seems that Ni enhances the diffusion of Cr. However, higher Ni concentrations accelerate the formation of the Cr-rich sigma phase detracting significant amounts of Cr from the matrix and deteriorating the corrosion resistance. Results of the oxidation tests reveal a positive effect of Si on the oxidation behaviour at 900 degrees C-1100 degrees C. It was found that Si enhances the Cr activity, though, facilitating the formation of the sigma phase.
机译:本研究研究了三种Co-17Re-18Cr-XNi(X = 8、15、25 at。%)合金和一种Co-17Re-18Cr-15Ni-2Si合金在800摄氏度温度范围内的氧化行为。 1100摄氏度。实验结果表明,随着Ni浓度的增加,抗氧化性得到改善。 Ni似乎增强了Cr的扩散。但是,较高的Ni浓度会加速富含Cr的σ相的形成,从而从基体中转移出大量的Cr,并使耐腐蚀性下降。氧化试验的结果表明Si对900℃至1100℃下的氧化行为具有积极作用。发现Si增强了Cr活性,尽管这促进了σ相的形成。

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