Transient oxide formation on APS NiCrAlY after oxidation heat treatment

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Journal titleJournal of Thermal Spray Technology
Pages621629; # of pages: 9
SubjectAlumina layers; Continuous films; Continuous layers; Heat treatment temperature; High temperature; NiCrAlY; NiCrAlY coating; Oxidation heat; Oxide formation; Oxidizing environments; Surface oxide; surface oxide formation; Heat treatment; Oxidation; Alumina
AbstractIn 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. © 2010 ASM International.
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AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21271301
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Record identifierda3b5685-2047-4bcc-8931-e3c35e747771
Record created2014-03-24
Record modified2016-05-09
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