Microstructure studies of air-plasma-spray-deposited CoNiCrAlY coatings before and after thermal cyclic loading for high-temperature application

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• 作者：Dipak Kumar ; K. N. Pandey ; Dipak Kumar Das
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：23
• 期：8
• 页码：934-942
• 全文大小：3,821 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X
• 卷排序：23

文摘

In the present study, bond-coats for thermal barrier coatings were deposited via air plasma spraying (APS) techniques onto Inconel 800 and Hastelloy C-276 alloy substrates. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and atomic force microscopy (AFM) were used to investigate the phases and microstructure of the as-sprayed, APS-deposited CoNiCrAlY bond-coatings. The aim of this work was to study the suitability of the bond-coat materials for high temperature applications. Confirmation of nanoscale grains of the γ/γ′-phase was obtained by TEM, high-resolution TEM, and AFM. We concluded that these changes result from the plastic deformation of the bond-coat during the deposition, resulting in CoNiCrAlY bond-coatings with excellent thermal cyclic resistance suitable for use in high-temperature applications. Cyclic oxidative stability was observed to also depend on the underlying metallic alloy substrate.Keywordsthermal barrier coatingscoating structureplasma sprayingthermal cyclehigh-temperature applicationsmicrostructure studies