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High-temperature wear mechanisms of tinbwn films:Role of nanocrystalline oxides formation

Friction 2023年第3期11卷 460-472页

作者： Leilei CHEN Zhenyu ZHANG Ming LOU Kai XU Lu WANG Fanning MENG Denis MUSIC Keke CHANG Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of TechnologyDalian 116024China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Department of Materials Science and Applied Mathematics Malmo UniversityMalmö20506Sweden

Réfractory high/medium entropy nitrides(HENs/MENs)exhibit comprehensive application prospects as protective films on mechanical parts,particularly those subjected to sliding contacts at elevated *** this study,a new MEN system tinbwn,forming a single fc solution,is designed and its wear performance at temperatures ranging from 25 to 750℃is *** wear mechanisms can be rationalized by examining the subsurface microstructural evolutions using the transmission electron microscopy as well as calculating the phase diagrams and interfacial adhesion behavior employing calculation of phase diagram(CALPHAD)and density functional theory(DFT).To be specific,increased wear losses occur in a temperature range of 25-600℃,being predominantly caused by the thermally-induced hardness degradation;whereas at the ultimate temperature(750℃),the wear loss is refrained due to the formation of nanocrystalline oxides(WnO_(3n-2r)TiO_(2),and TiOx),as synergistically revealed by microscopy and CALPHAD,which not only enhance the mechanical properties of the pristine nitride film,but also act as solid lubricants,reducing the interfacial ***,our work delineates the role of the in situ formed nanocrystalline oxides in the wear mechanism transition of tinbwn thin films,which could shed light on the high-temperature wear behavior of refractory HEN/MENfilms.

关键词： high/medium entropy nitrides(HENs/MENs) tinbwn thin films wear mechanisms nanocrystalline oxides

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