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Coatings of SiO 2 –TiO 2 films are frequently used in a number of optical thin film applications. In this work we present results from depositing films with variable Si/Ti ratios prepared by reactive sputtering. The different Si/Ti ratios were obtained by varying the target composition of composite single targets. Compared to co-sputtering this facilitates process control and composition...
Apart from titanium, its alloys and CoCrMo alloys, austenitic steels are widely used in medical applications. In order to improve the frictional wear resistance of these steels, they are subjected to various surface treatments such that the good corrosion resistance of the steels is preserved.The paper analyzes the structure and phase composition of AISI 316L steel after subjecting it to low-temperature...
Niobium coatings were prepared on graphite by low pressure chemical vapor deposition using niobium chloride and hydrogen as the reactant gases. The effects of deposition temperature on the morphology, phase, and deposition rate of niobium coatings were studied. The as-deposited niobium coatings were characterized by scanning electron microscopy and X-ray diffraction. The results indicate that the...
This paper describes new experiments on the heavy ion desorption yield measurements with 5 MeV/u Ar 8+ and summarizes all results of experiments with 5 MeV/u Ar 8+ performed at The Svedberg Laboratory in Uppsala (Sweden). These results are important for the update and design of the FAIR facility at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt (Germany) where the required...
SnO 2 nanoparticles (NPs) of average diameter of ∼10.5 nm, synthesized in SiO 2 using Sn − ions implantation combined with thermal annealing, were irradiated with 1.5 MeV Au 2+ ions at room temperature. The NP structure was studied as a function of ion fluence by transmission electron microscopy and micro-Raman spectroscopy. Prior to ion irradiation, SnO 2 NPs...
This study presents calculation results of the stopping power (SP) of electrons of kinetic energy from 10 eV to 100 keV for some elemental solids. The method is based on utilization of the modified Bethe–Bloch SP expression and analytical expression for effective atomic electron number and effective mean excitation energies of target atoms, and for effective charge of incoming electrons, Sugiyama’s...
Highly conducting and transparent thin films of tungsten-doped ZnO (ZnO:W) were prepared on glass substrates by direct current (DC) magnetron sputtering at low temperature. The effect of film thickness on the structural, electrical and optical properties of ZnO:W films was investigated. All the deposited films are polycrystalline with a hexagonal structure and have a preferred orientation along the...
In this paper, the effect of vacuum pressures on the performance of a velvet cathode under repetitive high-current pulse discharges was experimentally investigated. A series of tests were carried out on a vacuum diode, powered by a ˜300 kV, ˜5 ns, ˜100 Ω and 1–300 Hz pulse generator. Typical results of discharge waveforms, vacuum pressure rises, and SEM pictures for total 1000 shots are presented...
Actinometry optical emission spectroscopy (AOES), single cylindrical Langmuir probe and electrostatic planar probe were used to investigate the active species (electrons, ions and atomic oxygen) of remote oxygen plasma in an RF (13.56 MHz) hollow cathode discharge system, as a function of applied power and gas pressure. The electron density and electron temperature were determined from Langmuir probe...
In–N codoped p-type ZnMgO films have been prepared by direct current reactive magnetron sputtering. The effect of Mg content on the properties of In–N codoped ZnMgO films was examined. The Mg content in the film is directly proportional to that in the target suggesting the same sputtering mechanism of Zn and Mg. The p-type behaviour of ZnMgO films was deteriorated with the Mg content increasing. The...
Titanium oxide thin films were deposited by DC reactive magnetron sputtering on ZnO (80 nm thickness)/soda-lime glass and SiO 2 substrates at different gas pressures. The post annealing on the deposited films was performed at 400 °C in air atmosphere. The results of X-ray diffraction (XRD) showed that the films had anatase phase after annealing at 400 °C. The structure and morphology of deposited...
Inductively coupled plasma reactive ion etching of titanium thin films patterned with a photoresist using Cl 2 /Ar gas was examined. The etch rates of the titanium thin films increased with increasing the Cl 2 concentration but the etch profiles varied. In addition, the effects of the coil rf power, dc-bias voltage and gas pressure on the etch rate and etch profile were investigated...
Approximately 1.5–2.5 μm thick nanocomposite coatings of TiAlCrYN were deposited using a four-cathode reactive unbalanced pulsed direct current magnetron sputtering system from the sputtering of Ti, Al, Cr, and Y targets in Ar + N 2 plasma. The TiAlCrYN nanocomposite coatings were deposited on various substrates such as high speed steel (HSS) drill bits, mild steel and silicon. TiAlCrYN coatings...
In this research, the microstructure, tribological and corrosion properties of plasma nitrided-oxidized AISI 316 austenitic stainless steel at high oxidation temperature were studied and compared with conventional plasma nitride. The structural, tribological and corrosion properties were analyzed using XRD, SEM, microhardness testing, pin-on-disk tribotesting and electrochemical polarization. Plasma...
Laser irradiation effects on the hardness of Al 5086 alloy have been investigated by using KrF Excimer laser of 248 nm wavelength, 23 mJ pulse energy, 20 ns pulse duration, and 100 Hz repetition rate. The square-shape samples were irradiated in air as well as in vacuum (∼10 −3 mbar) with a defocused beam of spot size 3.14 mm 2 at the target surface, where the laser fluence was 0.73 J/cm...
A model of multi-source thermal evaporation process was proposed to achieve higher deposition rate and uniformity of organic thin film. In this model, several point type sources were uniformly distributed around a circle and evaporated simultaneously to form a surface-like source. Based on the Monte Carlo method, the evaporation process was simulated, and the effect of the number of point type sources,...
ZnO thin films were grown on Si (1 1 1) substrates by pulsed laser deposition (PLD) at various laser repetition frequency in order to investigate the structural and optical properties of the films. The optical properties of the films were studied by photoluminescence spectra using a 325 nm He–Cd laser. The structural properties of the films were investigated by XRD measurement. The results suggest...
Titanium films of different thicknesses were deposited on glass substrates, using planar magnetron sputtering at 313 K substrate temperature. Their optical properties were measured by spectrophotometry in the spectral range of 200–2500 nm. Kramers–Kronig method was used for the analysis of the reflectivity curves of Ti films to obtain the optical constants of the films. In order to compare the influence...
Solar Probe+ (SP+) will employ a combination of in situ measurements and imaging to achieve the mission’s primary scientific goal: to understand how the Sun’s corona is heated and how the solar wind is accelerated. The Solar Probe+ thermal protection system (TPS) can be a carbon–carbon (C–C) composite shield, reaching temperatures of 1600–2100 K and submitted to radiation effects including physical...
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