THE TRIBOLOGICAL PROPERTIES OF THE COATED SINTERED MATERIAL

Abstract

The basic tribological properties were investigated – friction wear resistance and contact fatigue resistance of sintered steel materials. These samples were produced on the basis of commercial powder (Höganäs) type Astaloy CrL and Astaloy CrM containing 0.3% C. The samples were coated by PVD method with use the DLC type of coating with a thickness of about 1μm. In qualitative point of view, the coating is beneficial, for increase of resilience to wear, as well as for resistance to contact fatigue. The article described phenomena that cause a discrepancy between the friction and wear. The measurement of surface roughness and metallographic-microscopic analysis were used. It was noted that the DLC coating thickness of 1 m for sintered steels with standard porosity is insufficient.