Tribological properties of NiCr–Al2O3 cermet-based composites with addition of multiple-lubricants at elevated temperatures |
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| Affiliation: | 1. Institute for NanoEngineering Research, Department of Chemical, Materials and Metallurgical Engineering, Tshwane University of Technology, Pretoria, South Africa;2. Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure PMB 704, Nigeria;3. Department of Materials Engineering, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana;1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, PR China;2. Guangdong Provincial Key Laboratory of Advanced Welding Technology, China-Ukraine Institute of Welding, Guangdong Academy of Sciences, Guangzhou 510650, PR China;3. Kunming University of Science and Technology, Kunming 650031, PR China |
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| Abstract: | The tribological properties of NiCr-40 wt% Al2O3 (NC40A) cermet-based composites containing SrSO4 and other lubricant (graphite, MoS2 and Ag) against alumina ball were evaluated to identify their self-lubrication mechanisms from room temperature to 800 °C. The composites demonstrated distinct improvements in effectively reducing friction and wear, as compared to NC40A cermet. The best results were observed for NC40A–10SrSO4–10Ag composite, which exhibited satisfactory reproducibility of friction coefficient over a wide temperature range (200–800 °C) through high temperature cyclic friction tests due to the formation of synergistic lubricating films SrAl4O7, NiCr2O4 and Ag on the contact surface. |
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| Keywords: | Self-lubricating composites Synergistic lubrication Wide temperature range Tribological properties |
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