Abstract
Cyclic oxidation behavior of detonation-gun-sprayed Ni-5Al coating on Inconel-718 is discussed in the present study. Oxidation studies were carried out on both bare and coated superalloy substrates in air at 900 °C for 100 cycles. The thermogravimetric technique was used to establish kinetics of oxidation. X-ray diffraction, FESEM/EDAX, and x-ray mapping techniques were used to analyze the oxidation products of bare and coated samples. The weight gain of bare superalloy was higher than the Ni-5Al-coated superalloy. Both bare and Ni-5Al-coated superalloys followed nearly parabolic oxidation behavior. The Ni-5Al coating was able to reduce the overall weight gain by 26.2% in comparison with bare superalloy in the given environment. The better oxidation resistance of Ni-5Al coating may be due the formation of protective oxides phases such as NiO, Al2O3, and NiAl2O4 on the oxidized coating and Cr2O3 at the coating-substrate interface. The Ni-5Al coatings obtained from detonation-gun-spraying process showed very little porosity and low surface roughness values.
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Acknowledgments
The authors would like to thank Dr. Mukul Gupta of UGC-DAE Consortium for Scientific Research, Indore for performing XRD analysis. The authors also wish to thank Mr. Hiren Upadhyay of SIC, NIT Surat for performing SEM/EDAX analysis.
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Saladi, S., Menghani, J. & Prakash, S. A Study on the Cyclic Oxidation Behavior of Detonation-Gun-Sprayed Ni-5Al Coatings on Inconel-718 at 900 °C. J. of Materi Eng and Perform 23, 4394–4403 (2014). https://doi.org/10.1007/s11665-014-1240-0
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DOI: https://doi.org/10.1007/s11665-014-1240-0