Carbon black (CB) and silica are the common reinforcing fillers that increase the usefulness of rubbers. In this work the effect of CB/silica hybrid fillers on the physico-mechanical properties of nitrile rubber was investigated. The total hybrid filler is kept constant at 50 phr (parts per hundred rubber) and silica content in the hybrid filler is varied as 0, 10, 20, 25, 30, 40 and 50 phr. Totally seven different combination of composite samples are prepared using two roll mill. Cure characteristics and physico-mechanical properties such as tensile strength, compressive strength, tear strength, elongation at break, 100%, 200% and 300% tensile modulus, abrasion resistance, hardness, compression set and rebound resilience are studied experimentally. Results showed that cure time t90, Scorch time ts2, minimumtorque (ML), and maximum torque (MH) of CB/Sil hybrid increased as silica content increased. The crosslink density of rubber hybrid composites has been determined from this stress strain curve using analytical method and ANSYS software. From the experimental results, it is found that all the properties studied except elongation at break, compression set, rebound resilience and abrasion resistance decreases with increase in silica content in hybrid filler as the silica content makes the composites less stiff.
Experimental study on dry sliding wear properties of aluminum alloy 6026 were performed utilizing pin-on-disk wear testing machine, considering the wear parameters like the applied load on the pin and the rotational and track diameter of disk. Wear of the pin, coefficient of friction and frictional force were observed during the test procedure for analysis. The experimental trials were designed by L16 Orthogonal Array based on Taguchi’s design of experiments and a hybrid approach of gray relational analysis combined with response surface methodology was applied for optimizing the output responses. The optimum conditions obtained for lower wear, coefficient of friction and frictional force were 35.21 N load, 376 r/min speed of disk and 111.53 mm disk track diameter, respectively. Scanning electron microscopy image of specimens taken after testing shows that abrasive wear mechanism is the predominant mechanism of wear. Experiment of confirmation with optimum conditions shows that the result was nearer to the predicted results.
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