Preliminary Study of Oxidation Behavior of Cold Sprayed Nanostructured NiCrAlY Bond Coatings
Nanostructured NiCrAlY coating was deposited by cold spray, using a milled powder for applications as a bond coat to thermal barrier coating. A shot-peening treatment was then applied to the as-sprayed coating to modify the coating surface morphology. The oxidation behavior of the coating with the shot-peened surface was investigated under isothermal oxidation at 900oC and 1,000oC for different times. The oxidation behavior of the coating was characterized through surface morphology and cross-sectional microstructure by scanning electron microscopy and X-ray diffraction analysis. It was found that a uniform oxide layer was formed on the surface of the shot-peened nanostructured NiCrAlY coating during oxidation at temperatures of 900oC and 1,000oC. The nanostructure of the initial coating possibly promoted rapid formation of α-Al2O3 oxide. It was clearly revealed that the surface morphology of the coating significantly impacted the morphology of the oxide. The surface geometry of the coldsprayed MCrAlY coating must be modified to promote formation of a protective oxide film during oxidation, through application of a post-treatment process such as shot-peening.
Q. Zhang C.-J. Li C.-X. Li G.-J. Yang X.-R. Wang H.-T. Wang S.-C. Lui
State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineerin Advanced Materials and Processes, Honeywell Aerospace, Columbia Road, Morristown, USA
国际会议
北京
英文
2007-05-14（万方平台首次上网日期，不代表论文的发表时间）