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The influence of a pressure of gas mixture (10 vol% O2 + 90% N2) on an average size of copper oxide nanoparticles, produced in the plasma of low pressure arc discharge, has been studied as a basic process variable. A correlation between the dependence of average particle size on gas mixture pressure and the dependence of discharge gap voltage on product of interelectrode distance by a gas mixture...
A first study was carried out to define the appropriate parameters to create a passivation layer by SiF4/O2 plasma that resists lateral chemical etching by SF6 plasma via the STiGer process at a substrate temperature of −85 °C. The most efficient passivation layer was obtained for a SiF4/O2 gas flow ratio of 0.65, a pressure close to 1 Pa, and high RF source power.Submicron trenches with a critical...
We report the growth of single crystal hexagonal ε-Fe3N(111) film on SrTiO3(100) substrate by ablating high-purity iron target in activated nitrogen. The measurements of reflection high-energy diffraction, x-ray diffraction, atomic force microscopy and vibrating sample magnetometer reveal that the ε-Fe3N(111) films have well crystallization, smooth surface, and strong ferromagnetism. The root mean...
Al-Si coatings were prepared on AZ31B magnesium alloy by laser cladding (LC), friction stir processing (FSP) and hybrid technology (LC-FSP). The coating microstructure, composition and corrosion resistance were investigated using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and electrochemical measurement. The results indicated that compact, uniform,...
In this research, diffusion brazing of monocrystal silicon was performed using germanium powders as interlayer. The effects of brazing temperature (950–1050 °C) and time (1–3 h) were studied on the joint microstructure and its mechanical properties. The results indicated that, with the rise in brazing time and temperature, the morphology near the sample edge turned from sintered structures to bridge...
High power impulse magnetron sputtering (HIPIMS) is an emerging technique that improves the ionization rate of magnetron-sputtered materials. However, HIPIMS often demands further improvement in the ionization rate in some applications. In this study, we applied an unbalanced magnetic field to enhance the HIPIMS discharge, using a conventional magnetron and a coaxial electro-solenoid coil. Vanadium...
In various industrial applications including thin-film solar cells indium tin oxide (ITO) is widely used. In this research work highly electrically conductive Tin-doped indium oxide (ITO) was deposited on graphite substrate using e-beam evaporator at substrate temperature 300 °C and 400 °C. Thermal treatment of the deposited ITO thin film was further done with the temperature values up to 900 °C....
Inductively coupled plasma reactive ion etching of Ta thin films masked with photoresist was performed using C2F6/Ar, HBr/Ar and Cl2/Ar gases. The etch characteristics such as etch rate, etch selectivity and etch profile were investigated in different gas concentrations of each gas. The Cl2 chemistry showed high degree of anisotropy in etch profile as well as fastest etch rate and highest etch selectivity...
In this paper, heavily C-doped GaN samples were deposited on glass and PET substrates by the thermionic vacuum arc (TVA) method, for the first time. Microstructure, surface and optical properties of the carbon-doped GaN samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy, atomic force microscopy, and UV–Vis spectrophotometer. According to XRD pattern,...
Mesoporous γ-Al2O3 with high specific surface area is prepared via calcination of NH4Al(OH)2CO3 (AACH). The AACH is obtained by coprecipitation route with NH4HCO3 and NH4Al(SO4)2 as raw materials. The effects of pH value and calcination temperature on the characterization of products are investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N2 adsorption-desorption...
•Flexible Al-Si-N films can be prepared by magnetron sputtering.•Flexibility of the film is controlled by the energy delivered to the growing film.•The energy is controlled by ion bombardment.
The assessment of heat treatment on dissimilar Ni-Ti and Ti-Mo welding has been evaluated in this work. An experimental design 32 was used as optimization tool to evaluate the effect of time and temperature after the welding process on the welding quality. Welded joints without significant difference in the thickness of the welded wires were obtained successfully. After the heat treatment welded joints...
In this study, a novel duplex treatment (DT) combining plasma nitrocarburizing (PNC) and plasma nitriding (PN) was primarily developed for AISI 1045 steel. The modified samples were investigated by optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness test, and pin-on-disk tribotest. The results showed that the nitriding efficiency was remarkably improved by...
Here, the authors focus on the relationships between the vibrational properties and glass-forming ability (GFA) of an Fe-Co-Cr-Mo-C-B-Y alloy system. Among the alloy systems studied, the best glass former Fe41Co7Cr15Mo14C15B6Y2 bulk metallic glass (BMG) (Co7 alloy) showed the maximum vibrational wavenumber of acoustic and optical modes. The origin of the excellent GFA of the Co7 alloy was discussed...
Density functional theory (DFT) calculations have been performed to study the adsorption of hydrogen on the surface of pristine and nickel decorated Al12N12 and Al12P12 nano-cages. Decoration of nickel on the surface of nano-cages delivers four distinct geometries. Hydrogen adsorption is studied on the surface of Ni-decorated Al12X12 (X = N, P) in these four geometries (named as P1, P2, P3, and P4)...
Pulsed electron beam welding (EBW) is a novel welding process of which the welding beam current is modulated to pulsed square wave. Pulsed EBW is considered a promising method to increase the depth-width ratio and improve the mechanical property of welding joints. Pulsed beam current can be achieved by regulating the bias voltage on the control grid electrode of electron gun. For further studying...
We performed a density functional theory study to investigate the storage of hydrogen molecule on the interior and exterior of C3N nanotubes (C3NNTs). Adsorption energy values corresponding to the adsorption of H2 on the pristine C3NNT were calculated to be in the range of +2.31 to −5.27 kcal/mol for the interior and −1.22 to −2.13 kcal/mol for the exterior of the nanotube. The second adsorption of...
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