ИСТИНА

In this report the results of pulsed carbon plasma condensation ( = 10-13 cm –3, ionization rate 35%,pulse duration  = 400 sec, pulse frequency 1-3Hz). In the regime according AES spectroscopy the carbon coating-orientants with diamond short range order were obtained. The electric conductivity was 10-8 – 10-14Ohm-1cm-1 at the deposition temperature 50oC. The maximum hardness was as high as 9800 HV when the energy of C+ ions was equal 60 eV. The DLC coating-orientants possess an excellent adhesion and could be deposited on any substrates such as the metals, dielectrics, ceramics etc. A new type of diamond like carbon coatings (DLC) namely nanostructural coatings-orientants is considered having at present time no analogues in triboengineering (Levchenko et al.; 2008, 2013). Efficiency of these nanocoatings results from the established by the authors’ influence of the surface of these coatings on the level of structural ordering in the lube boundary layers adsorbed by the surface. It was found that the most perspective are mono- or polycrystalline coatings (M-carbon and P-carbon)j with the structure of two-dimensional linear-chained carbon. The level of orientating effect and coating characteristics depend on the parameters of coating synthesis, so it is possible to regulate them in the process of coating deposition. Authors have made a number of theoretical and experimental studies directed to optimal synthesis parameters finding, coatings structure and tribological characteristics analyzing and establish-ing correlation between the mentioned factors (the triad “synthesis parameters- structure-performances”. It was shown the coatings under studies increasing the level of molecular ordering in boundary layers provide an evident reducing in fric-tion coefficient and a widening of the temperature range of lube oils operation (Levchenko et al.;2013). On the contrary traditional DLC with amorphous structure have not such effect. Analysis of apparent activation energy of the process of boundary layer disrupture for steel specimens with polycrystalline nanocoatings - orientant had shown that this value exceeded essentially those obtained for the same specimens with amorphous carbon coating and without coating. A possibility of carbon coatings-orientants is considered for some practical triboengineering applications, namely for cutting fluids extrusion tread instrument. The M-carbon coating (thickness of 2 μk) was deposited by im-pulse condensation of carbon plasma on the work-top of shipless taps (burnishers) M8 х 1,25 made of high-speed steel. The test assembly was mounted on a vertical drill. The forces arising in the process of tread forming were registries by strain gauge transducer connected with computerized dynamometering system. Two commercial metal working fluids mineral oil - based (F1) and water-based (F2) were used.