Tribological behaviour of composite coatings for sliding wear resistance

Abstract

The present work is based on the development of hybrid composite coating for sliding wear resistance, where coating was developed using the HVOF (High Velocity Oxy-fuel) technique. The carbon has grown using an eco-friendly agricultural waste product that consists of excellent tribological properties and improved mechanical properties. The developed coating was tested for sliding wear resistance applications at elevated temperatures. The obtained result showed significant improvement in test results at evaluated temperatures where the value of hardness and residual stress coating has increased as temperature increases. The micro-hardness and residual stress was about 540HV and −12 MPa respectively. These changes were found due to the development of oxides and carbides in the developed coatings. The experimental test results showed that developed composite coating is temperature dependent. The experimental results shows that at 450 °C, composite coating shows lowest coefficient of friction (0.06), 95 µm value of wear. The presence of micron size hard particles along with Cr3C2 (chromium carbide), MoO2 (Molybdenum dioxide), and Mo2C (Molybdenum carbide) hard phase particles, which cause a barrier and is responsible for the wear reduction.