Effect of Adding Tungsten Disulfide to a Copper Matrix on the Formation of Tribo-Film and on the Tribological Behavior of Copper/Tungsten Disulfide Composites
- 68 Downloads
The tribological behavior and formation of tribo-film of copper/tungsten disulfide (WS2) composites featuring 0–30% WS2 volume fractions, prepared using spark plasma sintering were investigated. Results indicated that WS2 as addition into the copper matrix could effectively reduce the coefficient of friction (COF) of Cu/WS2 composites. The lowest COF obtained was 0.16, while the wear rate was approximately 5 × 10−5 mm3·N− 1·m−1 for the Cu/WS2 composite which contained 25vol% of WS2 (here defined as Cu-25WS2). X-ray photoelectron spectroscopy and transmission electron microscopy analyses indicated that an oxygen-rich tribo-film with a thickness of approximately 10 nm was formed on the wear track, while a thick layer which was rich in WS2 and Cu2S and with a thickness of approximately 50 nm was observed below the oxygen-rich tribo-film. The superior tribological properties could ascribed to the formation of these tribo-films.
KeywordsCopper matrix composites Tribological properties Tungsten disulfide Tribo-film Wear mechanism
This work was supported by the National Nature Science Foundation of China. [Grant Number 51475476]. Thanks to Dr. Yang Li, Dr. Xiaoqin Ou and Dr. Hui Deng from Central South University, China for their kind contributions.
- 19.Huiquan, C., Zhiyuan, Q., Lei, Z.: Tribological behavior of Cu matrix composites containing graphite and tungsten disulfide. Tribol. Trans. 6, 1037–1043 (2014)Google Scholar
- 21.Juszczyk, B., Kulasa, J., Malara, S., Czepelak, M., Malec, W., Cwolek, B., Wierzbicki, Ł: Tribological properties of copper-based composites with lubricating phase particles. Arch. Metall. Mater. 59 (2014)Google Scholar
- 23.BARIN: Thermochemical Data of Pure Substances, Nai-liang, C.H.E.N.G., et al. transl. Beijing: Science Press. (2003)Google Scholar
- 24.Liang, Y., Che, Y., Liu, X.: Thermodynamic data manual of inorganic. Northeast University Press, Boston (1993)Google Scholar
- 31.Ejima, T., Saitoh, K., Shinke, N., Taruma, M., Hirai, Y.: Atomic-level analysis of copper sulfide (Cu2S): crystal structure and sliding characteristics. Technology Reports of Kansai University. 54, 23–33(2012)Google Scholar
- 33.Bowden, F.P., Tabor, D.: The friction and lubrication of solids I: Oxford: Clarendon Press (1950)Google Scholar