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The article deals with a reduction of friction coefficient of bearing steel 100Cr6. Reduction of friction was achieved by means of a CarbonX DLC coating. The coating exhibited excellent friction and mechanical properties. This coating was applied to samples made of 100Cr6 bearing steel. The friction results of the CarbonX coating were compared to the friction results of the 100Cr6 bearing steel. Reducing the friction of 100Cr6 bearing steel resulted in reduced wear and increase lifetime. The friction process of the samples will take place in an environment without lubrication. The aim of the article is to verify the behaviour of the DLC coating without the presence of lubricant in the friction node. The achieved results are to be interpreted in the conclusion of article.

. Pancielejko, A. Czyżniewski, V. Zavaleyev, A. Pander, K. Wojtalik: Optimization of the deposition parameters of DLC coatings with the MCVA method. Archives of Materials Science and Engineering 2012 , 52 (4), 60-67. 16. A. Erdemir, Ch. Donnet: Tribology of diamond-like carbon films: recent progress and future prospects. J. Phys. D: Appl. Phys. 2006 , 39, R311–R327. 17. H. Kim, S. Han, Q. Yan, T. Altan: Evaluation of tool materials, coatings and lubricants in forming galvanized advanced high strength steels (AHSS). CIRP Annals -Manufacturing Technology 57 2008 p. 299


The paper deals with a quality of the PVD coated HSS taps when cutting the stainless austenitic chromiumnickel non-stabilized steel DIN 1.4301 (X5CrNi 18-10). The main attention is focused on the analysis of loading (cutting moment, specific energy) of the HSS taps by means of pieso-electrical dynamometer Kistler 9272 and the relation between the quality of duplex and triplex PVD coatings and their effects on the quality of machined thread surfaces and tool life of the taps. The results showed a safe and stabilized cutting with acceptable quality of threads for HSSE with the TiN+TiCN+DLC coating.

References 1. Hauert, R., A review of modified DLC coatings for biological applications. Diamond and Related Materials 2003, 12 (3-7), 583-589. 2. Roy, R. K.; Lee, K.-R., Biomedical applications of diamondlike carbon coatings: a review. Journal of Biom edical Materials Research, Part B: Applied Biomaterials 2007, 83B (1), 72-84. 3. Narayan, R. J., Nanostructured diamond-like carbon th in films for medical applications. Materials Science and Engineering C: Biomimetic Materials, Sensors and Systems 2005, C25 (3), 405-416. 4. Kelly, S., et al., Patterned

2011. [24] ZHANG, T.-HUAN, Y. : Nanoindentation and Nanoscratch Behaviors of DLC Coatings on Different Steel Substrates, Com- posites Science and Technology 65 (2005), 1409-1413. [25] VERCAMMENA, K.-Van ACKERA, A.-VANHULSELA, A.-BARRIGAB, J.-ARNSEKC, A. : Tribological Behaviour of DLC Coatings in Combination with Biodegradable Lubri- cants, Tribology International 37 (2004), 983-989. [26] BLAU, J. : Lab Handbook of Scratch Testing. Chapter 7 - Scratch Adhesion Testing, Oak Ridge: Blue Rock Technical Pub- lications, 2002. [27] RANDALL, X.-FAVARO, G.-FRANKEL, C

-2), 213-222. 25. Nurk, G., et al., Electrochemical properties of diamond-like carbon electrodes prepared by the pulsed laser deposition method. J. Solid State Electrochem. 2003, 7 (7), 421-434. 26. Barriga, J., et al., Tribological performance of titanium doped and pure DLC coatings combined with a synthetic bio-lubricant. Wear 2006, 261 (1), 9-14. 27. Dearnaley, G.; Arps, J. H., Biomedical applications of diamond-like carbon (DLC) coatings: A review. Surface and Coatings Technology 2005, 200 (7), 2518-2524. 28. Dorner, A., et al., Diamond-like carbon-coated Ti6Al

References [1] Podgornik B., Vižintin J., Borovšak U., Megušar F., Tribological properties of DLC coatings in helium, Tribol. Lett. 47(2) (2012) 223-230. [2] Gunes I., Cicek A., Aslantas K., Effect of Deep Cryogenic Treatment on Wear Resistance of AISI 52100 Bearing Steel, Trans. Indian Inst. Met. 67(6) (2014) 909-917. [3] Podgornik B., Borovsak U, Megusar F., Kosir K., Performance of low-friction coatings in helium environments, Surface & Coatings Technology 206 (2012) 4651-4658. [4] Nilsson M., Olsson M., Tribological testing of some potential PVD and CVD

L., Szymahski W., Walkowiak B.: Blood platelets in contact with nanocrystalline diamond surfaces, Diamond&related materials 15, 10 (2006), 1535-1539. 20. Grill A.: Diamond-like carbon coatings as biocomplatible materials- an overview. Diamond&related materials, 12, 2 (2003), 166-170. 21. Hauert R: A review of modified DLC coatings for biological applications. Diamond&related materials 12, 3-7 (2003), 583-589. 22. Freitas R.A.: Foresight Update, 39 Foresight Inst. Palo-Alto, CA, USA, 1999. 23. Dearnley P.A.: A review of metalli, ceramic and surface treated metals