Dependence of Mechanical and Tribological Properties of Diamond-Like Carbon Coatings on Laser Deposition Conditions and Alloying by Metals

摘要

The paper deals with the study of the effect of the intensity of the pulse laser irradiation of a graphite target (the fluence) on the rate of deposition, density, and the mechanical and tribological properties of diamond-like carbon coatings formed on a steel substrate at room temperature. The dimimshing of the fluence from 50 to 5 MW/mm~2 yields a substantial (more than by an order of magnitude) increase in the coating deposition rate. However, these coatings have the lowered mechanical and tribological properties. The possibility of enhancing the coating characteristics by additional alloying with such metals as W and Ti in concentrations of up to ～10 at % is studied. The type of the metal and its distribution in the coating depth affect greatly the coating surfaces. The most stable combination of good antiwear and antifriction characteristics of the friction pair is reached after bulk alloying with tungsten.