Self-organized ionization zones and associated plasma flares were recorded with fast cameras inside-on view. Flare velocities were estimated to be about 20 000 m/s suggesting that the local tangential field E about 2000 V/m based on a concept where flare-causing electrons are initially ejected by EXB drift. At distances of 10 mm and greater from the target, where the electric fieldis very small, plasma flares are guided by the magnetic field B.
COBISS.SI-ID: 26294055
In this work mechanical and tribological properties of Cr/DLC coatings, deposited by anode layer source (ALS) were studied and compared to TiAlN/DLC coatings, deposited by magnetron sputtering. We made a complete characterization of the system and established optimal deposition parameters for various applications. The emphasis was given on evaluation of the influence of deposition parameters on the mechanical and tribological properties of the coatings. Pin-on-disk experiments showed that the DLC coatings prepared by ALS method possess better tribological propreties in comparison with those prepared by magnetron sputtering.
COBISS.SI-ID: 24806183
A target of multilayered TiAlN/TiN coating deposited on steel was irradiated by 200 fs pulses of a Ti:Sapphire laser, operating at 775 nm. Laser fluences of 1.16 J cm- 2 to 116 J cm- 2 produced a range of modifications, from well defined parallel surface structures on the coating, to deep craters in the substrate. Parameters for coating ablation were determined in terms of laser fluence and pulse count. A single-pulse damage threshold was found to be 0.66 J cm- 2 and the damage incubation factor 0.642. At lower laser fluences formation of laser induced parallel surface structures was evident, beginning from the first pulse, with a periodicity of about 580 nm. These structures remained and were pronounced at the rim of the damage spot even when the coating was completely ablated in the centre.
COBISS.SI-ID: 15272214
Growth defects are present in all PVD hard coatings. They have detrimental influence on their tribological properties. In order to improve the tribological properties of PVD hard coatings it is important to minimize the concentration of growth defects. Conventional TiAlN single layer as well as AlTiN/TiN and TiAlN/CrN nanolayer coatings. By means of 3D-profilometry we performed several measurements and detailed analysis on a series of samples from the several hundred production batches. The influence of growth defects on GDOES (glow-discharge optical emission spectrometry) depth resolution and pitting corrosion was also studied.
COBISS.SI-ID: 25571623
Multilayer PVD coatings are obtained when substrates rotate along the targets of different materials. The trajectories of the substrates are therefore rather complex and the multilayer structure depends on the number of rotational axes, the initial position of substrates and the geometrical parameters of the deposition system. The properties of multilayer coatings are influenced by the thickness and the sequence of layers. Using the simulation we can calculate the deposition rate, the sequence and the thickness of the individual layers for any particular rotation of the sample. In present paper the simulated multilayer structures were compared to deposited TiAlN/CrN multilayer coatings. Samples with a different number of rotational axes and different initial positions were prepared for transmission electron microscopy and compared to the simulation. The simulated multilayer structures agree well with the deposited structures.
COBISS.SI-ID: 23341863