TITLE

Transient Oxide Formation on APS NiCrAlY After Oxidation Heat Treatment

AUTHOR(S)
Puetz, Philip; Xiao Huang; Yang, Q.; Tang, Z.
PUB. DATE
March 2011
SOURCE
Journal of Thermal Spray Technology;Mar2011, Vol. 20 Issue 3, p621
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this study, the transient surface oxide formation on APS NiCrAlY samples was examined after oxidation heat treatment at temperatures between 1000 and 1100 °C. The surface oxides observed on the NiCrAlY surface included a sporadic top layer of NiO and a continuous layer of alumina immediately adjacent to the NiCrAlY coating. Cr-rich oxide in smaller quantities than alumina was also found surrounding the NiO and dispersed within alumina. The alumina assumed whisker-shaped morphology when being observed from the surface but formed continuous film along the NiCrAlY surface. Although the formation of alumina has been observed on all the samples examined in this study, the NiCrAlY sample heat treated at 1050 °C for 5 h generated more continuous α-alumina layer and also contained less surface NiO and Cr-rich oxide. Based on the results, it is believed that NiO developed first upon exposure to an oxidizing environment at high temperature, and stable alumina began to form with the increase in heat treatment temperature and time.
ACCESSION #
58133115

 

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