Influence of Pt on Oxidation Behavior of CoNiCrAlY Alloy

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• 作者：Lan Hao ; ^{lanhao1982@126.com} ; Yang Zhigang ; Zhang Yuduo ; Zhang Chi
• 关键词：platinum ; CoNiCrAlY alloy ; oxidation behavior
• 刊名：Rare Metal Materials and Engineering
• 出版年：2012
• 期刊代码：P57_18755372
• 类别：et
• 出版时间：February, 2012
• 卷：41
• 期：2
• 页码：194-198
• 文件大小：433 K

摘要

The microstructure, hardness and isothermal oxidation behavior of CoNiCrAlY alloy modified by addition of 3 wt%and 5 wt%Pt were investigated using scanning electron microscopy, Vickers hardness tester, X-ray diffraction and energy dispersive spectroscopy analysis. The results reveal that Pt has a significant influence on the microstructure of the experimental alloy by formation of 尾-(Ni,Pt)Al phase. Addition of Pt can slightly increase the hardness of the experimental alloys. Pt will accelerate the phase transformation of alumina from metastable 胃-Al₂O₃ to stable 伪Al2O3, which is the main reason for the lowering oxidation rate and the formation of a protective oxide scale on the Pt-containing alloys. Furthermore, adding of Pt can improve the Al transport, which suppresses the consumption of 尾phase and eliminates the internal oxidation.