Abstract
An 8 wt% Y 2O 3-ZrO 2/NiCrCoAlY graded coating was fabricated on a TC4 (Ti-6Al-4V) surface by air plasma spraying. Microscopic analysis showed that the ZrO 2/NiCrCoAlY graded coating exhibits a stepwise distribution in composition from metallic bond layer to ceramic top layer, consisting of t′-ZrO 2 phase and supersaturated Ni-based solid solution phase, and displays tight coherence with the TC4 substrate. In addition to mechanical combination, chemicometallurgical reaction combination occurs at some locations and small amounts of NiTi 2 and TiAl 3 phases at the coating-substrate interface develop during spraying.
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