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Cu-doped Sb2Te3 films were deposited at room temperature by the magnetron sputtering method, structure, microstructure and thermoelectric properties of the as-deposited and annealed films were systematically investigated. The results revealed that, while the as-deposited films were amorphous, the annealed films were crystallized into rhombohedral phase. Scanning electron microscope image showed tiny...
Tungsten Inert Gas (TIG) cladding process employing pre-sintered 11.8 wt.% TiB2/Ti-6Al-4V composites as cladding material was carried out to produce wear-resistant coating on Ti-6Al-4V substrate. It was found that high quality composite coating consisting of heterogeneously distributed coarse primary TiB phase, fine eutectic TiB whisker (TiBw) and highly refined Ti-6Al-4V grains was obtained. Maximum...
Thin 160Gd targets (enrichment 98.12%) in the thickness range of 45–55 μg/cm2 have been prepared on carbon backing in the high vacuum environment using thermal evaporation technique. During the fabrication, a few of the challenges faced were the oxidizing tendency of Gd in the atmosphere, limited amount of enriched material and the peeling off problem during floating of the films. Several trials were...
In this study, we presented a comparative investigation on the electrical, optical, and structural properties of three types of transparent conductive oxides (TCOs), including tin-doped indium oxide (ITO), zinc-doped indium oxide (IZO) and hydrogen-doped indium oxide (In2O3:H or IO:H) films. Post-annealing treatment (195 °C, 30 min, and air ambient) was performed to optimize the material characteristics...
The use of a subterahertz gyrotron setup with output frequency of 263 GHz and a nominal power of 1 kW as a radiation source to obtain nanoscale particles of metal oxides by the evaporation-condensation technique is demonstrated. Zinc oxide ZnO and tungsten trioxide WO3 were the test substances. The substance evaporation was provided by a focused beam of electromagnetic radiation with an estimated...
This study is to pinpoint the effect of B doping and Ti-B co-doping on the crack resistance of CrN coating via nanoindentation. X-ray photoelectron spectroscopy (XPS) indicated that, besides Cr-N bond, B-N bond formed in CrBN coating while B-N and Ti-N bonds formed in CrTiBN coating. Owing to the stronger B-N, Ti-N bonds and nano-composite structure, CrBN and CrTiBN coatings presented a much higher...
Wetting of typical industrial grades of Ti by Al 4043 alloy was studied by the sessile drop method at 873–973 K under high vacuum. Al/Ti is a typical reactive wetting system, and the double phases in TC4 alloy but only one phase in pure Ti caused the different interfacial structure. The mass transport was enhanced at liquid/solid interface due to the loosened Al3Ti layer in Al/TC4, but the compact...
Current and voltage waveforms of a pulsed discharge have been measured in a wide frequency range (20–300 kHz) for the two pressure values of 0.1 and 1 Torr using four different technology-relevant gases: nitrogen, oxygen, carbon tetrafluoride and sulfur hexafluoride. It is shown that the current can be substantially increased in the pulsed dc discharge, especially with electronegative gases, as compared...
PtOx films were deposited by direct current reactive magnetron sputtering in Ar/O2 mixture atmosphere. Subsequently, post-deposition heat treatments were conducted in air ambient at temperatures from 400 to 600 °C for 1 h with the heating rate of 10 °C/min. Effects of the annealing temperature on properties of PtOx films such as the structure, morphology, composition, electrical resistivity and infrared...
During the pumping process of unbaked all-metal vacuum systems after air exposure, water dominates in a time of ∼105 s (>10−6 Pa). The pumping rates of vacuum systems are difficult to be calculated because of the term of the re-adsorption rates. Under the assumption of quasi-equilibrium state between the adsorption and the gas phases, theoretically, the isotherms of water can be used to solve the...
TaN(Ag) composited coatings are being investigated to improve biocompatibility of different biomedical devices due to the mechanical and chemical stability of TaN and bactericidal effect of silver nanoparticles. However, controlling the size, density, shape and especially the release of silver ions (Ag) into the surrounding medium becomes a challenge, since elevated levels of Ag could be cytotoxic...
The Zr1-xAlxN films have been deposited on Si (111) and glass (soda lime glass) substrates by ion beam assisted deposition. The microstructure, morphology, electrical resistivity and optical properties of the Zr1-xAlxN films were investigated by XRD, TEM, four-probe method and spectroscopic ellipsometry. In the Al composition range 0.32 ≤ x ≤ 0.7, the Zr1-xAlxN films contain crystallized ZrAlN (NaCl...
A new pulsed electron beam facility was constructed, which is specially designed to investigate the cathode plasma on the microsecond timescale. The new triode type accelerator GESA-SOFIE is equipped with a large-area explosive emission cathode. The electron beam is focused on the target in a guiding magnetic field. Particle-in-cell code simulations were used to develop an enhanced and more flexible...
The crystallization behavior of Er-doped Ge2Sb2Te5 phase-change materials is investigated systemically for phase change memory application. It is observed that Er dopants can serve as a center for suppression of face-centered-cubic to hexagonal phase transition of Ge2Sb2Te5 films, leading to a one-step crystallization process. The crystallization temperature, 10-year data retention ability and crystalline...
In this study, remarkably differing to reported well-defined triangular WSe2 flakes, porous WSe2 flakes with large amount of holes were deposited using graphene quantum dots(GQDs) as promoters. By employing this method, triangular or circular thorough holes can be efficiently deposited on basal plane of WSe2 flakes. The size of holes and density of edges vary with layer number of WSe2 basal plane...
The dropper-type gas flow measuring apparatus is widely used in the vacuum pumping speed measurement. An innovative method based on the weighing principle was proposed in the paper. The structure and working principle of the dropper-type gas flow measuring apparatus is introduced. An electronic scale was placed under the storage tank to measure the oil mass into dropper. The corresponding formulas...
The effect of target power density, substrate bias potential and substrate temperature on the thin film composition was studied. A Cr-Al-C composite target was sputtered utilizing direct current (DCMS: 2.3 W/cm2) and high power pulsed magnetron sputtering (HPPMS: 373 W/cm2) generators. At floating potential, all Cr-Al-C thin films showed similar compositions, independently of the applied target power...
The high-performance thermochromic vanadium dioxide (VO2) films can be applied in many industrial applications such as smart windows, infrared sensors, and infrared imaging (bolometers). The preservation of its highly thermochromic properties of VO2 films is crucial since the oxidation number of vanadium ranges from +2 to +5 under various reducing or oxidizing atmospheres at elevated temperatures...
Metal-dielectric composite coating has wide application for solar selective absorbing coating in concentrating solar power (CSP) systems. A novel Co-WC-Al2O3 duplex ceramic metal-dielectric composite solar selective absorbing coating were prepared by combined high velocity oxy-fuel spraying (HVOF) with sol-gel method. Al2O3 particles were added to the Co-WC absorbing layer to improve the solar selectivity...
Adding electronegative gas to the inert gas is an important means of adjusting the plasma parameter distribution. In this paper, a fluid model of the Ar/O2 inductivly coupled plasma (ICP) is used to investigate the parameter distribution, while the electron energy distribution function (EEDF) and the transport coefficients are obtained by the Boltzmann equation solver module to improve the accuracy...
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