Abstract
The high temperature oxidation behaviour of plasma carburisation on Ni based third generation single crystal superalloy with NiCoCrAlYHf high temperature oxidation protective coating (HY5) is investigated in this paper. The Ni based third generation single crystal superalloy with single HY5 high temperature oxidation protective coating is compared to the plasma carburised samples. HY5 high temperature oxidation protective coating is deposited onto the single crystal superalloy by arc ion plating. The performance of diffusion during thermal cycling at 1100°C was studied. The microstructure and phase composition were examined by scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS). The results show that by means of plasma carburisation into the HY5 high temperature oxidation protective coating, its microstructure can be made finer and more uniform, and its microhardness and adhesion to the substructure can be improved markedly. There were smaller quantities of topologically close packed phases (TCPs) and secondary reaction zones (SRZs) precipitated under coating in the single crystal superalloy.
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