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Effect of Ion Plating TiN on the Oxidation of Sputtered NiCrAlY-Coated Ti3Al-Nb in Air at 850-950°C

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Abstract

A single sputtered NiCrAlY coating and a complexcoating of inner ion-plated TiN and outer sputteredNiCrAlY were prepared on the intermetallic compoundTi3Al-Nb. Their oxidation behavior wasexamined at 850, 900, and 950°C in air by thermalgravimetry combined with XRD, SEM, and EDAX. The resultsshowed that Ti3Al-Nb followed approximatelyparabolic oxi dation, forming an outer thinAl2O3-rich scale and an inner TiO2-rich layer doped withNb at the three temperatures. The TiO2-richlayer doped with Nb dominated the oxidation reaction.The single NiCrAlY coating did not follow parabolicoxidation exactly at 850 and 950°C, but oxidizedapproximately in a parabolic manner, because theinstantaneous parabolic constants changed slightly withtime. Besides the Al2O3 scale,TiO2 formed from the coating surface at the coating-substrate interface. Thedeterioration of the coating accelerated with increasingtemperature. The NiCrAlY-TiN coating showed two-stageparabolic oxidation at 850 and 900°C, and anapproximate parabolic oxidation at 950°C. The TiN layerwas effective as a barrier to inhibit coating-alloyinterdiffusion.

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Authors
  1. F. C. Rizzo
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  2. Chaoliu Zeng
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  3. Weitao Wu
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Rizzo, F.C., Zeng, C. & Wu, W. Effect of Ion Plating TiN on the Oxidation of Sputtered NiCrAlY-Coated Ti3Al-Nb in Air at 850-950°C. Oxidation of Metals 50, 71–88 (1998). https://doi.org/10.1023/A:1018823901649

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