Diamond-like-carbon coatings (DLC) have exceptional chemical, protective and tribological properties. They are increasingly used in industry. DLC coatings are characterized by high hardness, resistance to chemical agents and low coefficient of friction and it is a reason to check of its use in tribological pair cooperation in automotive means of transport.The main goal of the article is to determined tribological parameters of DLC layers and to check the possibility of its using for the regeneration of injector elements for the self-ignition engine, which is the injector needle in Common Rail system. This component is responsible for proper operation of the injector (opening and closing) and is made as a precision pair with a injector socket. The injector needle cooperates with the socket in a reciprocating manner, which leads to the wear of these elements and appearance of seizures. Fuel quality is also an important issue.Currently, DLC layers are used in industry, but their application in the processes of regeneration of precision parts in means of automotive transport is rather marginal. The article presents the results of tribological studies of DLC layers used as regeneration layers for self-ignition engines injectors in Common Rail system. On the basis of the obtained test results, it can be concluded that the use of DLC coating on the surface of selected parts of cooperating injectors in the Common Rail system will allow for longer life.Keywords: DLC layers, injector of self-ignition engine, wear, regeneration, tribological studies
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