Abstract
Boron carbide (B4C), silicon carbide (SiC) and silicon nitride (Si3N4) can achieve low coefficient of friction (Cof) under high relative humidity condition. Therefore, B4C/SiC and B4C/Si3N4 tribo-pairs may exhibit outstanding tribological behaviors, while the tribological investigation is poor. In present investigation, we performed the friction tests of the B4C/SiC and B4C/Si3N4 tribo-pairs under various relative humidity conditions, and revealed that the B4C/SiC tribo-pair is a promising candidate for high relative humidity engineering applications. Surprisingly, the B4C/SiC tribo-pair exhibited much better tribological behaviors than the B4C/Si3N4 tribo-pair with the same test condition and tribochemical products. This is mainly attributed to less wear debris on the SiC ball and the formation of a stable tribochemical film containing boric acid and silica gel.
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