54. Sliding Abrasive and Adhesive Wear Behavior of TIG-Cladded NiTi–W Coating Deposited on Ti–6Al–4V Alloy

The wear characteristic of NiTi–W composite layer developed on Ti–6Al–4V alloy by using TIG cladding route was evaluated. The NiTi–W composite coating fabricated with preplaced Ni–Ti–W powder with 9:9:2 weight ratio and at 60 A current and 2.3 mm/s scan speed has been tested against an abrasive disk and hardened steel (HRC 58) under different normal load and sliding velocity conditions to analyze its sliding abrasive wear and adhesive wear behaviors. The effect of test conditions on the wear characteristic of the NiTi–W clad layer was analyzed in-depth and compared with the wear characteristic of the uncoated Ti–6Al–4V alloy. It was found that the NiTi–W composite coating shows up to eleven times better wear resistance than the uncoated Ti–6Al–4V alloy under abrasive wear test conditions and more than seven times under sliding adhesive test condition.