Dmitrii V. Sidelev

Antifriction coatings based on a-C for biomedicine applications

This article reports on the investigation of mechanical properties of carbon films deposited by dual magnetron sputtering system with closed and mirror magnetic field. There is shown that a-C films with predominantly sp2-phase have relatively high hardness (up to 20 GPa) and low friction index (~0.01). The influence of magnetic field on friction index is determined. The analysis of experimental data shows the obtained a-C samples can be used for biomedicine applications.

Aluminum films deposition by magnetron sputtering systems: Influence of target state and pulsing unit

This article reports on technological possibilities of magnetron sputtering systems with solid-state and liquid-phase targets to deposition of aluminum films and its structure. The comparison of deposition rates of magnetron sputtering systems with direct current (DC), midfrequency (MF) and high power pulsed (HiPIMS) supplies is shown. The optical emission spectroscopy indicates a high component of target material ions in discharge gap only to HiPIMS technique. Al films are a (111)-line oriented in DC and MF power supply cases, for high power pulsed unit - aluminum films also have intense (220)-line. The dependence of grain sizes and sputtering technique parameters is obtained.

MAGNETRON SPUTTERING WITH HOT SOLID TARGET: THERMAL PROCESSES AND EROSION

This work focuses on erosion and thermal processes taking place on the surface of the titanium target in magnetron sputtering. The study was carried out using magnetron sputtering systems (MSS) with different thermal insulation target types from the magnetron body. It was found that the presence of an evaporation component allows the rate of removal of atoms from the surface of a solid target to be increased with limited thermal conduction. A mathematical simulation was used to evaluate the contribution of evaporation to the increase in the coating deposition rate for complete and partial thermal insulation. It was found that non-uniformity of the direct-axis component of the magnetic induction vector helps to localize the heating. also increases the evaporation rate on the surface of the target. It was proved that local evaporation including sublimations on the surface of a hot target is a significant factor in increasing the coating deposition rate. Due to this mechanism, the coating deposition rate can be increased 5 times for Ti in comparison with fully cooled targets. This result can be applied for direct current magnetrons and also for pulsed systems. It was also found that evaporation increased the energy efficiency of the target erosion. The most suitable metals were selected for obtaining high-intensity emission of atoms from a solid target.