COMPARISON OF TRIBOLOGICAL PROPERTIES OF A DLC JOINTLY WITH STEEL / CERAMICS UNDER DRY FRICTION AND BOUNDARY LUBRICATION

. Studies conducted in the last decade having proven experience of many years of practical use in friction units of various mechanisms and machines used in the national economy, have shown that the effective way to ensure their longevity, reliability and energy conservation is to apply DLC coatings on the friction surfaces of contacting parts in these friction nodes. It has now been established that the effectiveness of the use of these coatings is determined to a large extent by the conditions of their operation and the materials of the contacting parts. In the presented article, friction pairs are compared in terms of anti-friction properties, in which the studied steel samples with an amorphous DLC coating applied to steel through an intermediate layer of titanium aluminitride wear out under conditions of dry friction and film lubrication. Standard balls made of bearing chromium alloyed steel and ceramics based on silicon nitride are used as a wearing coupled element. Tribological experiments are carried out on the well-known laboratory installation KT-2 with an upgraded friction unit, which allows for the contact of a wearing ball with three horizontally positioned rollers, on the cylindrical surfaces of which the coating under study is applied. The article provides an analysis of the results of these experiments. In addition to DLC coating tests, data on tests of uncoated and coated samples with only a layer of titanium aluminitride are provided for comparison. A harder coupled element material can significantly affect the tribological properties, destroying coatings, thereby reducing the positive effects of the antifriction properties of coatings, and even lead to increased wear due to the formed abrasive particles in the friction zone.

DLC coating, amorphous carbon, slip coefficient, wear, ceramic wear sample, polyalphaoleic oil, intermediate coating