Abstract
In this study, the reducibility from silicate minerals is determined and its effect on their tribological properties as lubricant additive is introduced firstly with magnesium silicate hydroxide (MSH) and biocarbon-modified magnesium silicate hydroxide (MSH@C) as operating medium. The differentiated reduction effects induced by MSH and MSH@C are clarified through worn surface analysis, and related tribological tests are conducted on a four-ball machine under different conditions. Results show that biocarbon surface-coating on MSH will enhance the reducibility of MSH and results in better lubrication performance (wear reduced by 10.487 % and friction reduced by 11.321 % under boundary lubrication while wear reduced by 16.566 % and friction reduced by 33.871 % under mixed lubrication compared with MSH) by reducing Fe2O3 to Fe3O4 more effectively on worn surfaces. Besides, the reduction mechanisms of MSH and MSH@C on iron oxides are explained.
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