STUDY ON LUBRICATING MECHANISMS OF LA(OH)3 NANOCLUSTER MODIFIED BY COMPOUND CONTAINING NITROGEN IN LIQUID PARAFFIN

In this paper, the tribological properties of La(OH)(3) nanocluster mo dified by compound containing nitrogen as additive in liquid paraffin were investigated using four-ball machine. The results show that La(OH )(3) nanocluster modified by compound containing nitrogen as additive in liquid paraffin has high load-carrying capacity, good antiwear and friction reduction properties. The lubricating mechanisms were studied by using EPM-810Q model electron probe microanalyzer (EPMA) and PHI-5 702 multi-technique surface X-ray photoelectron spectrometer (XPS). Th e results show that the boundary film on the worn surface is made of p hysically adsorbing film (N-containing organic compound) and tribochem ical reaction film (lanthanum oxide). The physically adsorbing film an d tribochemical reaction film formed during friction contributed to go od tribological properties of La(OH)(3) nanocluster modified by compou nd containing nitrogen as additive in liquid paraffin. (C) 1998 Elsevi er Science S.A. All rights reserved.