Abstract
A layer of platinum was fabricated through electroplating on the surface of NiCoCrAl model alloy. Diffusion characteristics and oxidation behaviour of Pt-coated NiCoCrAl compared to uncoated was investigated at 1050 °C. The platinum inter-diffusion layer within the alloy was obtained through the heat treatment. For microstructural characterization results of scanning electron microscopy were combined with X-ray diffraction data. Due to different covalent bonding calculated by first principle calculation, the platinum presented different diffusion abilities in β-NiAl and γ′-Ni3Al phases during the heat treatment. The calculated elastic constant and elastic moduli revealed that Pt-doped β-NiAl and γ′-Ni3Al possess better elastic and mechanical properties than β-NiAl and γ′-Ni3Al. The platinum addition restrained the spallation of Ni-rich oxide on Pt-coated NiCoCrAl alloy compared to uncoated, hence the adhesion between the oxide layer and NiCoCrAl alloy was improved.
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