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A deterministic theory describing the melting of an ultrathin lubricant filmbetween two atomically smooth solid surfaces has been developed. The lubricantstate is described by introducing a parameter of excess volume that arisesowing to the solid structure chaotization at its melting. The thermodynamic andshear kinds of melting are described consistently. The dependences of thestationary friction force on the lubricant temperature and the shear velocityof rubbing surfaces that move with respect to each other with a constantvelocity have been analyzed. In the framework of a simple tribological model,the stick-slip mode of friction, when the lubricant periodically melts andsolidifies, has been described. The influence of velocity, temperature, andload on the stick-slip friction has been analyzed. A qualitative comparisonbetween the results obtained and experimental data has been carried out.

Phenomenological Theory of Boundary Friction in the Stick-Slip Mode