Abstract
The interfacial tribo-chemistry significantly affects the tribological behaviors of polycrystalline diamond (PCD)/Si3N4, especially introducing acid solution. The results indicate that the friction coefficient rises with increased PH while Si3N4 wears severer and then slighter. Besides, when the hydrogen ions were introducing in the testing environment, the hydrolysis reaction of Si3N4 and oxidation reaction of PCD were promoted on the surfaces with the formation of Si-OH and C-OH. The tribo-pair surfaces absorded hydrogen ions by protonation reaction to form the double electron layer in this process, during which significantly affect the tribological behavior of Si3N4. This work elucidates that the protonation effect of hydrogen ions and bridge effect of hydroxyls, leading to the friction and wear mechanism of PCD/Si3N4.
Published Version
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