Abstract
A multilayer coating with alternate NiCrAlYSiHfN/AlN nanocrystalline layers was prepared by dual-magnetron reactive-sputtering. The NiCrAlYSiHfN layers comprised γ-Ni, hcp-AlN, CrN and Cr2N while AlN layers comprised hcp-AlN and metallic Al. The kp of the alumina scale is equal to that of α-Al2O3 on β-NiAl alloy. The alumina scale comprised alternate coarse- and fine-grained alumina sublayers with a few dispersed Ni(Cr) particles. Degradation of the multilayer coating, including partial decomposition of the AlN layers and precipitation of large-grained AlN within the NiCrAlYSiHfN layers, was observed. Inter-diffusion with the triple-layer structure in the IDZ between the coating and the substrate occurred.
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