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The effect of expanded graphite with sodium metasilicate as lubricant at high temperature

Journal Article


Abstract


  • © 2019 Elsevier Ltd Lubrication is vital in enabling the key machinery contact components to operate durably and reliably at extremely high temperatures for space aviation and metal forming. In this work, the expanded graphite in sodium metasilicate solution as high temperature lubricant was evaluated using a ball-on-disc tribometer. The results suggest that the use of this mixture can remarkably reduce the friction and wear of steel counterparts by up to 85% and 60% at 850 °C, respectively, compared with unlubricated condition. These improvements result from the formed tribo-layer containing amorphous carbon and sodium carbonate melt, as well as the two different ordered crystal layers on the rubbing interface induced by high temperature, pressure and shear. The expanded graphite in sodium metasilicate solution studied here for the first time will extend its application for high temperature lubrication due to its excellent performance.

Publication Date


  • 2020

Published In


Citation


  • Wang, L., Tieu, A., Zhu, H., Deng, G., Hai, G., Wang, J. & Yang, J. (2020). The effect of expanded graphite with sodium metasilicate as lubricant at high temperature. Carbon, 159 345-356.

Scopus Eid


  • 2-s2.0-85076944627

Number Of Pages


  • 11

Start Page


  • 345

End Page


  • 356

Volume


  • 159

Place Of Publication


  • United Kingdom

Abstract


  • © 2019 Elsevier Ltd Lubrication is vital in enabling the key machinery contact components to operate durably and reliably at extremely high temperatures for space aviation and metal forming. In this work, the expanded graphite in sodium metasilicate solution as high temperature lubricant was evaluated using a ball-on-disc tribometer. The results suggest that the use of this mixture can remarkably reduce the friction and wear of steel counterparts by up to 85% and 60% at 850 °C, respectively, compared with unlubricated condition. These improvements result from the formed tribo-layer containing amorphous carbon and sodium carbonate melt, as well as the two different ordered crystal layers on the rubbing interface induced by high temperature, pressure and shear. The expanded graphite in sodium metasilicate solution studied here for the first time will extend its application for high temperature lubrication due to its excellent performance.

Publication Date


  • 2020

Published In


Citation


  • Wang, L., Tieu, A., Zhu, H., Deng, G., Hai, G., Wang, J. & Yang, J. (2020). The effect of expanded graphite with sodium metasilicate as lubricant at high temperature. Carbon, 159 345-356.

Scopus Eid


  • 2-s2.0-85076944627

Number Of Pages


  • 11

Start Page


  • 345

End Page


  • 356

Volume


  • 159

Place Of Publication


  • United Kingdom