The correlation between tribological properties of nanostructure TiN coatings and deposition process parameters in PACVD system

Titanium base coatings are being used extensively for improving wear characteristics at the surface ofdifferent parts. Titanium nitride was deposited by Plasma Assisted Chemical Vapor Deposition (PACVD)techniques with purpose improve interface with substrate, as this can increase wearing of the entire part inspite of desirable wear behavior of TiN. Samples from H13 steel were prepared and they experienced plasmanitriding (PN) prior to TiN deposition. TiN coatings were deposited in different conditions of temperature(475, 500 and 525°C) and duty cycle (33, 40 and 50%). Topographic studies were preceded by Atomic ForceMicroscope (AFM). Surface hardness was evaluated using Vickers\u27s micro-hardness test. In order to studythe wear behavior, pin-on-disc test was chosen which included examining the sample\u27s resistance againstpins from steel and tungsten carbide-cobalt. Based on the results obtained it can be observed that increasingthe deposition temperature from 475 to 525°C will lead to higher values of hardness, thus the obtainedweight loss from samples decreased from 2.1 to 0 mg. In addition to that, with increasing the duty cycle ofsystem from 33 to 50%, weight loss of the TiN coating has increased from 0 to 2mg due to an increase in thevalue of surface roughness