Al2O3/Mo composite and its tribological behavior against AISI201 stainless steel at elevated temperatures |
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| Affiliation: | 1. School of Materials Science and Engineering, Xi''an University of Technology, Xi''an 710048, China;2. School of Materials Science and Engineering, Xi''an University of Science and Technology, Xi''an 710054, China;3. Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China;4. State Key Laboratory for Mechanical Behavior of Materials, Xi''an Jiaotong University, Xi''an 710049, China;1. Department of Materials Engineering, Faculty of Engineering, Malayer University, Malayer 65719-95863, Iran;2. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran 16846-13114, Iran;1. Materials Physics Research Institute, School of Physics, University of the Witwatersrand, Wits, Johannesburg 2050, South Africa;2. DST/NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Wits, Johannesburg 2050, South Africa;3. Institute for Chemical Technologies and Analytics, Vienna University of Technology, Vienna, Austria;1. TU Bergakademie Freiberg, Institute of Materials Engineering, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;2. TU Bergakademie Freiberg, Institute of Materials Science, Gustav-Zeuner-Str. 5, 09599 Freiberg, Germany;1. School of Manufacturing Science and Engineering, Sichuan University, Chengdu 610065, PR China;2. The Analysis and Testing Centre, Sichuan University, Chengdu 610065, PR China |
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| Abstract: | Al2O3-reinforced molybdenum (Mo) composites were successfully prepared by powder metallurgy to improve the wear resistance of Mo components at high temperature. The reinforced Al2O3 particles are uniformly distributed in the Mo matrix; thus, the Al2O3/Mo composite is harder than monolithic Mo. The friction coefficients of both monolithic Mo and the Al2O3/Mo composite decrease by 37% and 42%, respectively, at 700 °C compared with those at room temperature (self-lubricating phenomenon). This phenomenon is attributed to the formation of very soft MoO3 and FeMoO4 metal oxides on the friction surface at high temperature. The Al2O3/Mo composite has better wear resistance than monolithic Mo at both room temperature and at 700 °C. The notable resistance of the composite particularly at 700 °C can be attributed to its increased hardness and the soft tribofilm forming on the worn surface. |
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