M50 Matrix Sintered with Nanoscale Solid Lubricants Shows Enhanced Self-lubricating Properties Under Dry Sliding at Different Temperatures
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Self-lubricating materials have attracted enormous interest from manufacturers and researchers around the world recently to enhance the durability and lifespan of mechanical components. Hence, the high-level objective of this study is to provide insight into how TiO2 and graphene (G) nanomaterials (NMs) could contribute toward enhancing replenishment of the self-lubricating layer on the worn surface of M50 matrix to maintain a supply of solid lubricant. Frictional samples were fabricated by spark plasma sintering (SPS), then their tribological properties against Si3N4 balls were evaluated using a pin-on-disk tribometer at various temperatures. The wear mechanisms of the rubbing surfaces were also elucidated using electron probe microanalysis (EPMA), field-emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), three-dimensional (3D) surface profilometry, and X-ray photoelectron spectrometry (XPS). The results of the tribotests indicated that M50 manufactured with TiO2 and TiO2/G hybrid NMs presented excellent antifriction/wear properties at temperatures of 25–450 °C, in comparison with the reference material (M50 steel). This is mainly because of the nanoscale solid lubricant added into the M50 microstructure. The results highlight a novel self-lubricating technology for M50 steel sintered with NMs for use in manufacturing of mechanical components for aerospace and automobile engines.
KeywordsMetal-matrix composites Nanomaterials Antifriction/wear Self-lubricating layer
The authors would like to express their deep appreciation to the National Natural Science Foundation of China (NSFC) for support via project no. 51875423. The authors would also like to acknowledge support from the Hubei Key Laboratory of Advanced Technology for Automotive Components (Wuhan University of Technology). M.K.A. Ali acknowledges financial support from Minia University during the postdoctoral study. The authors also wish to thank the reviewers and editors for their helpful and valuable comments and contributions.
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