High temperature lubrication and mechanism of sodium carbonate by interface tailoring
RIS ID
144499
Abstract
© 2020 This paper reports the potential application of sodium carbonate as an environmentally friendly and inexpensive high-temperature lubricant for hot rolling of steel. This process has been simulated by ball-on-disc sliding tests at temperatures of 645 to 920 °C. Compared with unlubricated conditions, reductions in friction and wear of 68% and 98% respectively were achieved during sliding at 730 °C with a contact pressure of 0.84 GPa. The significant improvement of the tribological properties was attributed to the tribo-induced melting of sodium carbonate at the sliding interface, which acted as a liquid lubrication layer and formed a shear-induced nano-gradient tribofilm structure. The sodium carbonate melt was readily sheared and produced low friction and negligible wear. The nano-gradient tribofilm structure which formed under sliding inhibits cracking and spalling, resulted in a low wear due to strain delocalization. These findings highlight the potential application of a low cost, low hazard sodium carbonate as a high temperature lubricant for hot metal forming. It also provides insights into the tribological mechanisms of high temperature lubrication.
Publication Details
Wang, L., Tieu, A., Wang, P., Hai, G., Mitchell, D. & Zhu, H. (2020). High temperature lubrication and mechanism of sodium carbonate by interface tailoring. Applied Surface Science, 530