“…The materials in the form of e.g., Si 3 N 4 or SiC are currently used as, e.g., antiwear coatings for single and multilayer cutting blades. Apart from that they are the subjects of research in the field of material and surface engineering in order to find new applications for materials used in machine construction [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ]. Other examples are the use of additives in the form of graphite particles or nanocomposites to increase the lubricity and durability of oils [ 27 , 28 ].…”