1Department of Mechanical Engineering, Park College of Engineering and Technology, Coimbatore, Tamilnadu, India.
2Department of Metallurgical Engineering, PSG College of Technology, Coimbatore, Tamilnadu, India.
3Department of Production Engineering, National Institute of Technology, Tiruchirapalli, Tamilnadu, India.
4Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirapalli, Tamilnadu, India.
In this investigation, Mild steel (AISI 1020) has been selected as the base material in the form of pins. Powders of pure molybdenum and Ni/Cr (80/20) were selected as the coating system. High velocity oxy-fuel technique was selected as the coating technique. The objective of this work is to study the dry sliding wear behavior of Mo-Ni/Cr HVOF sprayed coatings. The 150μm thick Mo and Ni/Cr coating with various percentages (i) 0% Mo+100% Ni/Cr, (ii)15% Mo+85% Ni/Cr, (iii) 40%Mo+60%Ni/Cr and (iv)100%Mo were deposited on the base material. The wear behavior of Mo-Ni/Cr pin on Ti-6Al4V disc tribo pair was analyzed by conducting wear studies under constant load of 1 Kg, sliding speed of 1.0 m/sec, sliding distance of 1000 m at room temperature and also at high temperature(250°C) using a pin-on-disc wear tester. The friction and wear characteristics of the coatings were studied. Also, the micro hardness variations of the different Mo- Ni/Cr coatings were studied.
Sliding Wear, Micro hardness, HVOF spraying, Wear resistance, Mo-Ni/Cr Coatings
