Exploring the Sliding Wear Behavior of PA66/PA6 Blend Nano Composites: Influence of Load and Velocity

1Department of Mechanical Engineering, Bangalore Institute of Technology, Bangalore -560004 2Department of Mechanical Engineering, Government Engineering College, K R Pet -571426 Karnataka State, India 3Department of Industrial Engineering and Management, Bangalore Institute of Technology, Bangalore -560004 Bangalore – 6560004, India --------------------------------------------------------------------***----------------------------------------------------------------------Abstract—The effect of nano graphene on the dry slide wear behaviour of Polytetrafluroethyele (PTFE) and Molybdenum disulphide (MoS2) filled PA66/PA6 blend composites is investigated. Blend (PA66/PA6) (80/20 wt.%), Blend (PA66/PA6)/10 wt. % PTFE/5 wt. % MoS2 and Blend (PA66/PA6)/ 10 wt. % PTFE/5 wt. % MoS2/2.5 wt. % TiO2 /2.5 wt. % Nano Graphene are the materials subjected to investigation. These composites were developed using extrusion melt mix method and followed by injection molding. ASTM G99 method procedural steps have been adopted for the wear test. The sliding wear behavior was studied by varying sliding load (25, 50, 75 and 100 N) and sliding velocity (0.5, 1, 1.5 and 2 m/s). It is observed that the synergistic effect of PTFE and MoS2 was not promising for the wear resistance of PTFE and MoS2 filled PA66/PA6 blend composites. But the blend showed the better wear resistance than micro composites. Inclusion of TiO2 and nano Graphene significantly enhanced the wear resistance of Nano composites. This is because of synergism of PTFE, MoS2 and Nano Graphene. PTFE and MoS2 would form the uniform polymer film on the steel disc. Further, Nano Graphene has strengthened the polymer film further improving the sliding wear resistance. The thermal effects on the frictional surface was controlled by the micro filler TiO2. The impact of velocity is severe compared to sliding load. The SEM images were used for examining the worn surfaces and the reasons for the tribological failure were evaluated.