Multi-scale tribological and nanomechanical behavior of cold sprayed Ti2AlC MAX phase coating

作者：Loganathan Archana; Sahu Ashutosh; Rudolf Chris; Zhang Cheng; Rengifo Sara; Laha Tapas; Boesl Benjamin; Agarwal Arvind

来源：Surface and Coatings Technology, 2018, 334: 384-393.

DOI：10.1016/j.surfcoat.2017.11.067

• MAX phase coating
• Cold spray
• Nano-scratch
• Wear
• Coefficient of friction

Ti2AlC based MAX phase coatings were successfully deposited on Inconel 625 substrate by a cold spraying technique. A dense coating of 70 mu m thickness was deposited. Ball-on-disk wear behavior of Ti2AlC coating at room temperature (25 degrees C), and high temperature (600 degrees C) were studied. The coefficient of friction (COF) and wear volume loss at 600 degrees C reduced by similar to 21% and similar to 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 degrees C and varying loads. For a low load of 7000 mu N at room temperature, Ti2AlC coating exhibited a higher elastic modulus of 273 GPa compared to the elastic modulus of 191 GPa at high temperature (300 degrees C). The room temperature nano-scratch at 7000 mu N displayed brittle behavior with fracture, chipping and wear debris formation along the scratch path. However, high temperature (300 degrees 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 8 N 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.

• 出版日期2018-1-25