Mechanical and Dry Sliding Wear Behavior of Particulate Fillers CaCO<SUB>3</SUB> and CaSO<SUB>4</SUB> Filled Vinyl ester Composites

Abstract

The imp roved performance of poly mers and their co mposites in industries and many other applications by the addition of part iculate fillers has shown great advantages and so has lately been the subject of considerable interest. In this paper, mechanical and tribological behavior of particu late fillers CaCO 3 and CaSO 4 filled v inyl ester co mposites have been presented. Wear tests were carried out in dry sliding conditions on a pin-on-disc friction and wear test rig. (DUCOM) at roo m temperature under slid ing velocity (1.57, 2.62 and 3.67 m/sec.), normal load (20, 40 and 60 N), filler content (0, 10 and 20 wt.%) and sliding d istance (1000, 3000 and 5000 m). The plans of experiments is based on the Taguchi technique, was performed to acquire data in a controlled way. An orthogonal array and analysis of variance (A NOVA ) were applied to investigate the influence of process parameters on the coefficient of friction and sliding wear behaviour of these composites. The coefficient of frict ion and specific wear rate were significantly influenced with increase in both the filler content. The results show that for pure vinyl ester the coefficient of frict ion and specific wear rate increases with the increase of normal load, sliding velocity and sliding d istance. The coefficient of friction and specific wear rate for CaCO 3 filler decreases with the increase of filler content. But, for filler CaSO 4 the coefficient of frict ion and specific wear rate decreases at 10 wt.% and then increases at 20 wt.%. It is believed that a thin film formed on stainless steel counterface was seems to be effective in improving the tribolog ical characteristics. The worn surfaces examined through SEM to elucidate the mechanis m of friction and wear behaviour.

Tribological behavior prediction of composite MoS2-TiO2 coating using Taguchi coupled artificial neural network approach

“…Based on the delta statistics, the ranks obtained for the process parameters correlate the relative magnitude of effects. 31…”

“…This results in a great reduction in cost and time. 31 The conventional practice involves consideration of one-factor-at-a- time, which involves change in one variable at a time and others are kept constant. The major limitation in the implementation of such approach is that it may omit any possible interactions between the defined set of parameters.…”

“…Based on the delta statistics, the ranks obtained for the process parameters correlate the relative magnitude of effects. 31 Confirmation tests. The confirmation of experiments is the last step involved in the DOE methodology.…”

Response surface methodology based on polyamide incorporated with biolubricant for optimisation of operating parameters in heavy vehicles

“…An additional obstacle is the corrosion caused by the ultraviolet radiation. PA6 is suitable for sliding surfaces like bearing and plate, gears, and seals, where temperature, speed and load should be minimised or adequate (Hutchings, 1992;Kumar and Chauhan, 2012). Polymer performance without lubrication of pure polyamide on both low and high load, sliding speed and sliding distance influences the tribological properties (Ani et al, 2005).…”

Sliding Wear Performance Evaluation of Red Mud (RM), RM + Fly Ash (FA) and RM + FA + Al Coatings on Mild Steel

“…But ceramic coatings exhibit failure mechanisms like plastic deformation, brittle fracture and polish effect [6], which in turn demands reinforcement of additives which could reduce the friction and wear of plasma sprayed ceramic coatings. The importance of mechanical and tribological properties has convinced many researchers to study the friction and wear behaviour and to improve the wear resistance of composite coatings [7]. Composite coatings can be considered to be one of the competitive materials for tribological applications because of their low friction values against steel counterparts, good damping properties, and self-lubricating abilities [8].…”