The structural changes of MO & nanoparticle LB film during rubbing process

A dialkyldithiophosphate modified MO & nanoparticle LB film was prepared on copper substrate. The tribological behaviors of the film against steel were evaluated using a one-way reciprocating frictiontester. The structural changes of the film during the rubbing process were investigated with a Fourier transform infrared microscope and by X-ray photoelectron spectroscopy. It was found that the nanoparticle LB films decreased the friction coefficient and increased the vvear resistance of the copper substrate significantly. Analyses indicate that formation of a transferred film on the steel counterface. and the occurrence of the tribochemical changes during friction process. mainly involved disordering and partial decomposition of the surface-modified agent. The nucleus of the MO & nanoparticle plays a role in load carrying and antiwear. especially after partial decomposition of the surface-modified agent with increased friction times. A shearing effect was mainly responsible for exciting the tribochemical change. 0 1999 Elsevier Science S.A. All rights reserved