Abstract
TiAlN and Al 2O 3 thin films (2.5 – 3 μm) were deposited on the Inconel 617 by physical vapor deposition methods. The effect of coatings on the thermal stability and wear properties of the Inconel alloy after heat-treatment (annealing) in an air and a helium atmosphere at 1000 °C, 48 h has been studied. The uncoated Inconel 617, annealed in both air and helium, showed a poor wear resistance and an inferior thermal stability due to both the formation of inhomogeneous corrosion scales composed of Cr 2O 3 on the Inconel surface and internal oxides in sub-surface area. Although both the TiAlN and Al 2O 3 coatings showed an enhanced thermal corrosion resistance and an increased wear resistance for samples annealed in both air and helium, Al 2O 3 showed much better performance than TiAlN as a protecting layer for the Inconel 617.
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