Abstract
Ti2AlC based MAX phase coatings were successfully deposited on Inconel 625 substrate by a cold spraying technique. A dense coating of 70μm thickness was deposited. Ball-on-disk wear behavior of Ti2AlC coating at room temperature (25°C), and high temperature (600°C) were studied. The coefficient of friction (COF) and wear volume loss at 600°C reduced by ~21% and ~40% respectively, due to the lubricious nature of oxide layer formed at a higher temperature. Mechanical properties of the Ti2AlC coating were also studied by carrying out nanoindentation and nano-scratch tests at room temperature and 300°C and varying loads. For a low load of 7000μN at room temperature, Ti2AlC coating exhibited a higher elastic modulus of 273GPa compared to the elastic modulus of 191GPa at high temperature (300°C). The room temperature nano-scratch at 7000μN displayed brittle behavior with fracture, chipping and wear debris formation along the scratch path. However, high temperature (300°C) scratch path exhibited ductile nature with plowing, cutting and no wear debris formation. The wear volume loss was several orders of magnitude higher at 8N load scratch. The overall wear behavior in MAX phase Ti2AlC coating at multiple load scales is elucidated in terms of the interaction volume varying from a single to several splats in the cold sprayed structure.
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