АДГЕЗИОННЫЕ ХАРАКТЕРИСТИКИ ТОНКОПЛЕНОЧНОГО ПОКРЫТИЯ, ОСАЖДАЕМОГО ПРИ ФИНИШНОМ ПЛАЗМЕННОМ УПРОЧНЕНИИ

Abstract

The methodology for determining adhesion characteristics of thin-film coatings applied from the vapor phase and used to protect parts against wear and corrosion has been considered. The study of adhesion properties, along with deter-mination of thickness, composition of elements, structure, physical-mechanical, and tribological characteristics, as well as wear coefficient, al-lows evaluating and selecting the optimal coat-ing and best technology for its application for a specific industrial application. On the example of studying DLCPateks diamond-like coating of aC:H/a-SiOCN system deposited during final plasma hardening, adhesion characteristics were assessed according to ISO 20502:2005 by scratch testing and according to ISO 26443:2008 by indentation of Rockwell diamond indenter. The first tests were performed to determine the load at which the depth of penetration of the indenter into the coating - substrate composition stops growing smoothly, which characterizes the moment of destruction of the coating. The ratio of the load on the indenter, determined at the end of the passage of the coating thickness, to the load of occurrence of the first cracks or delamination, in these tests is conventionally called the adhesion coefficient. The influence of the coating thickness on the adhesion coefficient has been studied. The tests associated with the use of a Rockwell diamond indenter punch qualitatively evaluate the adhesion properties of the coating by comparing the obtained and normalized impressions. The results of the tests proved improved adhesion characteristics of DLCPateks coating.