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Study examined the effect of heat treatment on friction and wear in polyurethane coatings, indicating improved coatings performance.
ABSTRACTThe friction coefficient and wear resistance of polyurethane coatings were investigated in the present work. Scratch test was carried out to determine the friction coefficient and wear scar width of the tested coatings. Heat treatment processes such as annealing, tempering and quenching were carried out to study their effect on the tribological properties of the tested coatings. It was found that, at temperature of heat treatment of 50 °C, friction coefficient significantly increased with increasing normal load. Annealed polyurethane of single layer coating displayed the lowest wear. When the coating thickness increased up to 0.5 mm (double layer) significant friction decrease was observed. Annealed coatings displayed the lowest friction values, while as received ones showed the highest values. Friction coefficient displayed by triple layers polyurethane coating recorded higher friction for quenched test specimens followed by tempered and annealed ones.For temperature of heat treatment of 75 °C significant increase in friction coefficient was predicted. Polyurethane coating of double layers showed the lowest friction coefficient values compared to single and triple layers. Friction coefficient displayed by the scratch of triple layers polyurethane showed slight friction increase. Quenched coatings represented the highest values, while annealed ones showed the lowest ones. Wear displayed by the scratch of single layer annealed polyurethane that heat treated at 50 °C showed the lowest wear. Quenched coatings displayed relatively higher wear than tempered and annealed coatings. Wear displayed by double layer polyurethane showed relatively lower values than that observed for 0.2 mm coatings. Quenched coatings displayed the highest wear values followed by the tempered coatings. Wear of triple layer polyurethane showed slight increase compared to double layers coatings. When the temperature of heat treatment increased to 75 °C, slight increase in wear for single layer polyurethane coatings was observed. Annealed coatings showed the lowest wear. Wear displayed by triple layers (0.8 mm) polyurethane represented the lowest values compared to single and double layers coatings. Annealed coatings showed the lowest wear values.
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Samy et al. (2014) studied this question.
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