Abstract
Graphite like Carbon: Niobium (GLC:Nb) thin films with different Nb contents were applied on GTD-450 stainless steel substrates. The microstructure, mechanical properties, friction coefficient and anti-corrosion performance of the coatings were investigated. The outcomes from Raman spectroscopy confirmed the formation of GLC phase. The results from X-ray diffraction (XRD) analysis also endorsed the formation of face center cubic Nb-C phase and by increasing the Nb content, the grain size of this phase increased. The hardness of the coating increased with increasing the Nb content, reaching to the value of ~12 GPa for Nb content of ~50 at% (N-4). On the contrary, the friction coefficient of the coated substrates decreased by increasing the Nb content. Electrochemical impedance spectroscopy (EIS) measurements depicted a remarkable improvement in the corrosion resistance of the GTD-450 stainless steel substrate coated by GLC:Nb. Altogether, considering the outstanding mechanical and anti-corrosion properties of the coated steel, the GLC:Nb coating can be propounded as an auspicious candidate to be applicable as a heavy-duty protective coating for the metal substrate which is used in harsh environments such as turbine blades.
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