Alumina Growth and Interface Strengthening Mechanisms of Pt on the Surface of Bond Coats in EB-PVD TBC System Based on First-Principles

Oxygen adsorption, aluminium segregation and interface adhesion on the surface of NiPtAl and MCrAlY bond coats (BC) in EB-PVD TBC system were investigated using first-principles calculations within the density functional theory (DFT). Examination of oxygen adsorption and aluminium segregation indica...

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Bibliographic Details
Published inMaterials science forum Vol. 850; pp. 253 - 258
Main Authors Ji, Qiang, Lu, Jian Sheng, Song, Peng, Liao, Hong Xing, Wang, Yi Qun
Format Journal Article
LanguageEnglish
Published Pfaffikon Trans Tech Publications Ltd 01.03.2016
Subjects
Pt
TBC
Interface Adhesion
Oxygen Adsorption
Aluminium Segregation
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Summary:Oxygen adsorption, aluminium segregation and interface adhesion on the surface of NiPtAl and MCrAlY bond coats (BC) in EB-PVD TBC system were investigated using first-principles calculations within the density functional theory (DFT). Examination of oxygen adsorption and aluminium segregation indicated that the addition of Pt always obstructed the growth of alumina. In addition, NiPtAl, as bond coats in EB-PVD TBC System, had less lattice variation and stronger interface adhesion than MCrAlY when alumina was produced. It is found that Pt is an important factor that affects the Al2O3 growth in thermal barrier coating. It is proved that Pt improves the bonding performance of Al2O3 and lifetime of thermal barrier coating. This offsets the high cost of Pt in industry application.
Bibliography:Selected, peer reviewed papers from the Chinese Materials Conference 2015, July 10-14, 2015, Guiyang, China
ISSN:0255-5476
1662-9752
1662-9752
DOI:10.4028/www.scientific.net/MSF.850.253