Evaluation of hardness, tribological behaviour and impact load of carbon-based hard composite coatings exposed to the influence of humidity

• Published in: Diamond and related materials 2011-04, Vol.20 (4), p.596-599
• Main Authors: Sobota, Jaroslav, Grossman, Jan, Bursikova, Vilma, Dupak, Libor, Vyskocil, Jiri
• Format: Article
• Language: English
• Subjects: Coatings; Composite coatings; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deposition; Deposition by sputtering; Diamond-like carbon; Drying; Exact sciences and technology; Fullerenes and related materials; diamonds, graphite; Hardness; Hardness tests; Humidity; Materials science; Mechanical and acoustical properties; Mechanical properties; Methods of deposition of films and coatings; film growth and epitaxy; Physical properties of thin films, nonelectronic; Physics; Specific materials; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Tribology
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2011.01.011

Diamond-like composite coatings were deposited by PACVD with an interface magnetron sputtered metallic layer prepared by d.c. unbalanced magnetron sputtering onto HSS substrates. The focus of the present work was on the study of the humidity effect on the tribological properties, hardness and impact resistance of the deposited coatings. The coatings were tested under both dry and humid conditions using several testing methods, like the pin-on-disc test equipped with linear reciprocating movement, impact test and depth sensing indentation test. It was found that the humidity may substantially influence not only the results of tribological tests, but surprisingly, also the results of the dynamic wear and hardness tests. By increasing the relative humidity, the value of dynamic impact resistance increased at an equivalent stress of 1.6 GPa more than three times. On the other hand, the wear rate of the coated part increased by more than four orders of magnitude. The results of the indentation test were influenced by humidity mainly at nanometre scales. The hardness measured at dry conditions was higher by 25% than the values obtained by the measurements under humid conditions. ► Humidity can significantly influence the impact resistance of carbon based coatings. ► By increasing the RH, the dynamic impact resistance increases more than three times. ► The wear rate of the coated part increases by more than four orders of magnitude. ► Humid environment may significantly influence the indentation results.