The aim of this work was to investigate the sliding wear coefficient k, using an\nexperimental sliding wear study on the valve-seat insert contact. Commercial\ninlet valve and seat inserts were used as test specimens. The tests were performed\nat room temperature and at 200Ã?Å¡C, using test duration of 72,000 cycles\nand 18,000 cycles, respectively, and both in dry sliding conditions. A load of 5\nN, an average speed of 22 mm/s and sliding distance of 2.2 mm were used for\nall tests. The sliding wear coefficients were calculated using experimental and\nanalytical methods. The wear volume was higher in the tests at 200Ã?Å¡C both in\nvalve and seat insert specimens. The principal wear mechanisms observed in\nvalve specimen were oxidation and abrasion.
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