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The tribological tests were carried out under different sliding speeds from 0.21 to 1.75 m\/s and loads from 30 to 250 N using a reciprocating tribometer to simulate the ring\/liner interface in the engine according to ASTM G181. The tribological results using hybrid nanolubricants suggested that the friction coefficient and wear rate of the ring decreased in the ranges 39\u201353% and 25\u201333%, respectively, compared to nanoparticles-free lube oil. The combined evidence of the worn surfaces analysis confirmed that the key mechanisms in antifriction and antiwear are a combination of the nanoparticles rolling mechanism and the replenishment mechanism of tribofilms on the sliding contact interfaces. In addition, a tribofilm formed on the rubbing surfaces is not only from the nanoparticles but also from Fe which is formed as a result of iron debris particles and oil additive package such as P and S originating from zinc dialkyldithiophosphate.<\/jats:p>","DOI":"10.1115\/1.4039720","type":"journal-article","created":{"date-parts":[[2018,3,23]],"date-time":"2018-03-23T15:33:41Z","timestamp":1521819221000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":34,"title":["Friction and Wear Reduction Mechanisms of the Reciprocating Contact Interfaces Using Nanolubricant Under Different Loads and Speeds"],"prefix":"10.1115","volume":"140","author":[{"given":"Mohamed Kamal","family":"Ahmed Ali","sequence":"first","affiliation":[{"name":"Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Automotive and Tractors Engineering Department, Faculty of Engineering, Minia University, El-Minia 61111, Egypt; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China e-mail:"}]},{"given":"Hou","family":"Xianjun","sequence":"additional","affiliation":[{"name":"Hubei Key Laboratory of Advanced Technology for Automotive Components, Wuhan University of Technology, Wuhan 430070, China; Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan 430070, China e-mail:"}]},{"given":"F. 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