STUDY ON THE TRIBOLOGICAL PROPERTIES OF ULTRADISPERSED DIAMOND CONTAINING SOOT AS AN OIL ADDITIVE

The ultradispersed diamond (UDD) powders synthesized by the detonation of explosives with negative oxygen balance are new nanomaterials with practical value. In this paper, the detonation soot and UDD powders w ere used as an additive in paraffin oil. This kind of two-phase lubric ant possesses excellent load-carrying capacity, antiwear and friction reduction properties. Under boundary lubricating condition, the detona tion soot and UDD powders can easily penetrate into the rubbing surfac es owing to their nanoscale to reduce the wear and friction. The deton ation soot is less effective than UDD powders. In addition to sliding; it is hypothesized that a nanoscale ball bearing effect is occurring in the UDD powders which reduces the wear and friction.