ANÁLISE COMPORTAMENTAL DOS COEFICIENTES DE ATRITO E DESGASTE DE SISTEMAS REVESTIDOS SUBMETIDOS A DESGASTE MICRO-ABRASIVO

Abstract

This work aims to study the influence of titanium nitride (TiN) and titanium carbide (TiC) coatings hardness on the friction coefficient and wear coefficient in ball-cratering micro-abrasive wear tests. A ball of AISI 52100 steel and two specimens of AISI D2 tool steel, one coated with TiN and another coated with TiC, were used in the experiments. The abrasive slurry was prepared with black silicon carbide (SiC) particles and distilled water. Two normal forces and six sliding distances were defined, and both normal (N) and tangential (T) forces were monitored constantly. The movement of the specimen in the direction parallel to the applied force was also constantly monitored with the help of a Linear Ruler. This procedure allows the calculation of the wear coefficient for the different sliding distances without the need to stop the test. The friction coefficient is determined by the ratio between the tangential and the normal forces, and for both TiN and TiC coatings, the values remained, approximately, in the same range (from μ = 0.4 to μ = 0.9). On the other hand, the wear coefficient decreases with the increase in coating hardness.