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    EFFECTS OF SLIDING SPEED IN A CuZn10 BRASS MATERIAL ON WEAR
    (SCIBULCOM LTD, 2009) Bagci, M.; Imrek, H.
    In, this experimental study, effects of sliding speed, load, coefficient of friction and, surface roughness on sliding wear were investigated. Many properties observed in metal sliding wear processes can be explained based on studying brass. For this reason, CuZn10 brass material was selected as the experimental specimen and tests were conducted under dry sliding wear conditions. The tests were conducted on a PLINT-TE53SLIM Multi-Purpose Friction and Wear Tester as block-on-ring, one of asymmetric configuration applications (ASTM G77). The contact between test specimen and counterface is a line. And a non-suitable contact geometry was used on opposite surface. The counterface was rotated at 10 different sliding speeds (0.25, 0.5, 0.75, 1, 1.25, 1.5, 4.75, 2, 2.25 and 2.5 m/s) and three different loads (5, 10 and 15 N) were applied on the test specimen, and every test specimen was subjected to 700 in tests. Graphs showing variations of weight loss against the applied loads and sliding speeds on the test specimen were plotted. Apart from this, graphs showing relation between coefficient of friction and sliding distance and that between surface roughness and sliding distance were plotted. Due to static coefficient of friction and high surface debrises at lower sliding speeds (0.25-0.75 m/s), wear values were high, whereas in higher sliding speeds (1.0-2.5 m/s), the wear values were low as a result of formation of oxide layers on contact surfaces. As sliding distances increased during low sliding speeds, firstly the coefficient of friction increased, then as the static friction was overwhelmed the coefficient of friction decreased. At higher sliding speed, depending on the increased heat, the coefficient of friction seemed to increase generally, this being caused by the oxide layer formed. With the increase in sliding distances some increase in surface debris values was observed. In addition, the increase in the load caused the increasing weight loss and hence higher Wears values.
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    Investigation of Automotive Primer and Basecoat Paint Surface's Adhesion by Solid Particle Erosion
    (AMER INST PHYSICS, 2018) Demirci, M.; Bagci, M.
    Millions of cars are sold around the world and tons of paint are used for these cars. Since the car paint industry is alive in this way, new developments in the paint sector have been taking place every day. It is important to determine how these developments affect paint erosion. Solid particle erosion wear is a subject that keeps its update for car paints and it always needs to be investigated in detail. The target of this experimental study is to investigate solid particle erosion behavior of a commercial acrylic/melamine primer surface and basecoat of automotive paint. As a erodent, silica particles having a weight of 1 to 5 kg were used. Tests were performed at 30 degrees and 90 degrees impact angle and particle velocity 23 m s(-1). With this work, an idea about the adhesion of the car paint coatings to the material surface was obtained.