In the micro-machine or precision machine, particles are often presented at contact interfaces. And these particles will affect the variation of plastic deformation of asperities and the contact temperature between the contact surfaces. In this paper, we used three-body microcontact model and contact temperature theory to evaluate elastic contact area, plastic contact area, elastic-plastically deformed contact area and contact temperature under the different particle sizes, velocities and applied loads conditions. The friction force is one of the main heat resources of contact temperature. Because friction coefficient is variable parameter in this work, the contact temperature rise between the contact surfaces is larger than that of assuming the constant friction coefficient conditions of CrMo steel for the different loads. The contact temperatures of particles and asperity increase when the velocity and applied load increase. The increases of particle size will give rise to the increase of particle temperature and decrease of asperity temperature on rough surface. The plastic deformed contact area increases when the particle size and particle density increase
