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 200�šC, 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 200�šC both in\nvalve and seat insert specimens. The principal wear mechanisms observed in\nvalve specimen were oxidation and abrasion.
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