Investigation of mechanical and tribological properties of multi-wall carbon nanotube, molibden disulfide and silicone filled carbon fiber/polyamide 66 composites

In this study, 10% carbon fiber filled PA66 (PA66/10CF), 20% carbon fiber filled PA66 (PA66/20CF), 30% carbon fiber filled PA66 (PA66/30CF), 0,5% multi-walled carbon nanotube filled PA66/30CF (PA66/30CF/0,5MWCNT), 0,5% multi-walled carbon nanotube+3% molybdenum disulfide filled PA66/30CF (PA66/30CF/0,5MWCNT/3MoS2) and 0,5% multi walled carbon nanotube+3% silicone filled PA66/30CF (PA66/30CF/0,5MWCNT/3Silicon) composites are produced by extrusion and injection molding methods. In this thesis, dry sliding wear characteristics of polyamide 66 and its composites were investigated using a pin-on-disc wear test machine. Wear tests were carried out at the sliding speeds of 0,4m/s; 0,8m/s and 1,2m/s applied loads of 20N, 30N and 40N and under atmospheric conditions of temperature and humidity. At the end of the experiments, effects of load, speed and fillers on the friction and wear behaviour of pure polyamide 66 and its composites were analyzed. As a result of the studies, carbon fiber, multi-walled carbon nanotube and silicone added to the PA66 polymer increased the tensile and flexural strength, elasticity and flexural modulus while decreased the elongation at breaks. For all materials, it was observed that, the coefficient of friction and wear rate increases linearly with the increase in applied load and sliding speed values. MoS2 filler has been identified as the most effective filler to the reduction of friction coefficient and wear rate. Keywords: Carbon Fiber, Mechanical Properties, Molybdenum Disulphide, Multi Walled Carbon Nanotube, Polyamide 66, Silicone, Tribological Properties.