Affiliations: CTU, Faculty of Mechanical Engineering, Technicka 4, 166 07 Prague 6, Czech Republic | SVUM a.s., Department of Heat Treatment, Bechovice, 197 00 Prague 9, Czech Republic | Institute of Nuclear Physics, Czech Academy of Sciences, 250 67 Rez, Czech Republic
Note: [] Corresponding author: F. Cerny, Department of Physics, Faculty of Mechanical Engineering, Czech Technical University, Technicka 4, 16607 Prague, Czech Republic. Tel.: +420 2 24352437; Fax: +420 2 24310292; E‐mail: [email protected].
Abstract: Coatings of CN_{x} have been prepared on the substrates of material Ti6Al4V, of which the human joint replacements are made. The deposition of the CN_{x} coating was carried out by PACVD method in apparatus with standard arrangement. The methane and nitrogen have been used as precursors for CN_{x} compound. The infrared absorption spectroscopy and Rutherford backscattering spectroscopy were applied on diagnostics of prepared CN_{x} layer. Beside carbon and nitrogen the hydrogen and oxygen were found in the coatings. The sliding tests were carried out with the samples. The counter parts were the cylinders made of the polyethylene of the same type as for big joint prostheses is used. The tests were carried out in the medium of physiological solution. The CN_{x} coatings perform well under the lower load of 25 and 50 N. When the load is increased to 100 N, the friction coefficient slowly increases, but measured values of μ are typical for boundary lubrication.
