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Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings

Chen, H.; McCartney, D.G.; Voisey, K.T.

Authors

H. Chen

D.G. McCartney



Abstract

This study deals with the isothermal oxidation behaviour of high velocity oxy-fuel sprayed MCrAlY coatings. Both free-standing coatings and coatings attached to IN738 and CMSX4 substrates undergo isothermal oxidation at 1100°C for up to 100h. The effect of surface conditions (as-sprayed and polished) has been investigated. Scanning electron microscopy and energy dispersive X-ray analysis were used to characterise the details of oxidation behaviour. The results have shown that both surface conditions and substrate type have a pronounced effect on oxidation behaviour. Extensive internal oxidation and nitridation is observed for polished coatings on Inconel 738 and is attributed to the combined effects of titanium diffusion from the substrate and enhanced surface diffusion due to polishing.

Journal Article Type Article
Journal Materials at High Temperatures
Print ISSN 0960-3409
Electronic ISSN 1878-6413
Publisher Taylor & Francis Open
Peer Reviewed Peer Reviewed
Volume 32
Issue 1-2
APA6 Citation Chen, H., McCartney, D., & Voisey, K. (in press). Effect of surface conditions on internal oxidation and nitridation of HVOF MCrAlY coatings. Materials at High Temperatures, 32(1-2), https://doi.org/10.1179/0960340914Z.000000000103
DOI https://doi.org/10.1179/0960340914Z.000000000103
Keywords HVOF; surface conditions; titanium diffusion; internal oxidation
Publisher URL http://www.sciencereviews2000.co.uk/view/journal/materials-at-high-temperatures
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Materials at High Temperatures on 19 January 2015, available online: http://www.tandfonline....60340914Z.000000000103.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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