Materials Literature
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Cohydrolysis of tetrabutoxytitanium and tetraethoxysilane in a desiccator in the presence of water vapor produced a TiO 2 -SiO 2 binary xerogel and its Cu(II)-containing analog. The hydrolysis was performed without using either a solvent, or redox catalysts. The effect of the synthesis conditions on the physicochemica…
The electronic and crystal structures of SrMgF4 single crystals grown by the Bridgman method have been investigated. The undoped SrMgF4 single crystals have been studied using low-temperature (T = 10 K) time-resolved fluorescence optical and vacuum ultraviolet spectroscopy under selective excitation by synchrotron rad…
The results of the experimental study of the crystalline structure and morphology of carbon fibers based on viscose in a FEBUS carbon-ceramic composite and its preform as functions of temperature ranging from room values to ∼400°C under irradiation with Ar + ions with an energy of 10–30 keV are obtained. The average l…
Transforming diamond sizes from the micron regime into a few billionths of a meter probably doesn't increase their value in jewelry, but it certainly adds an extraordinary value in numerous physical science, engineering, and medical applications. Nanodiamonds are generally defined as synthetic diamond materials that h…
Piezoelectric ceramics with 0.94Na0.5Bi0.5TO3–0.06BaTiO3 compositions were fabricated by solid state mixed oxide method and sintered at different temperatures varying from 1050°C to 1150°C to obtain dense ceramics. Phase analysis using X-ray diffraction showed tetragonal perovskite structure of Na0.5Bi0.5TO3 with no B…
An alternating current field enhanced powder-pack boriding (ACFPB) was employed to Q215 steels with a current of 4 A and a soaking time varied from 0 to 360 min at temperatures of 873, 973, 1073 K, respectively. Conventional pack boriding (CPB) was also conducted for comparison. The results showed that the boride laye…
In this work, the radial distribution function (RDF) of H2 adsorption on coronene (C24) and its Si Substituted forms was investigated by Monte Carlo method. The effect of number and position of silicon substituent on the Coronene (C24) was compared. The maximum value of RDF at 298 K and 0.1 MPa is 4.34 for 18 Si, A st…
The poly (m-phenylene isophthalamide) (PMIA) fiber, which can be prepared by wet spinning, is a kind of aromatic polyamide fiber. The spinning parameters could influence the performance and structure of the colored PMIA fiber such as the diffusion coefficient and coagulation bath. In this study, the PMIA spinning solu…
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This article presents a comprehensive investigation in the acoustic characteristics of flame-retardant PET mesh composite fabric and PU foam with the various bulk density of foam and weight ratio of vermiculite. By using impedance tube, absorption coefficients and acoustic impedance of composite material which play an…
A high selectivity patterning technology of vanadium oxide (VOx) thin film was suggested in this paper. VOxthin film was etched through a photoresist (PR) mask using Cl/N based gases in a reactive ion etching (RIE) system. Taguchi method was used for process design to identify factors that influence the patterning and…
Polymeric material, which is commonly used in packaging, has been widely applied due to the fact that it is lightweight and chemical resistant. Being non-degradable, polymeric waste can thus only be eliminated by burning, and subsequently, there is a rising need for degradable polymeric material to manage this manner…
The paper presents slow positron beam studies of the stainless steel grade 304 AISI samples annealed in the ow N2 atmosphere and sandblasted under dierent pressure from 1 to 7 bar. Heating of specimens caused formation of an additional layer on the surface which can be identied as oxides. Sandblasting reduces the thic…
Basically transformer oil is a petroleum by-product. At the time of petroleum refining process, we get pure transformer oil without any water content. Due to the atmospheric conditions and working conditions humidity is added with transformer oil there by water content in transformer oil increases during the transform…
In this contribution the free volume of glycerol phase conned in a nanopore in a wide temperature range is computed. The computed free volume is compared to the previously computed values in the glycerol bulk. The mean cavity volumes are also discussed with the experimental measurements by positronium annihilation lif…
In this study, Ca2+ stabilized ZrO2-SiC composite materials were prepared via carbothermal reduction, using natural zircon ore as raw material, CaO as additive, and black carbon as the reducing agent. The effects of synthesis temperature and CaO content on the phase composition of the products were investigated by XRD…
In this study, two agents (a foaming agent and a hardener) are mixed to form rigid polyurethane (PU) foams with various densities, which are separately poured into a mold with a three-dimensional (3D) fabric to form 3D fabric/foam composites. The mechanical property and sound absorbency of the composites are examined.…
By means of chemical composition testing, scanning electron microscopy observation, metallographic observation and hardness gradient detection etc, analysis of the typical failure samples from a well-known brand GD8020×1100 ball screw unit in the fatigue test was carried on. Results show that there is no obvious surfa…
The double-perovskite La0.4Sr1.6CoNbO6-δ(LSCN) powders were synthesized by the solid-state reaction method. The electrical conductivities of LSCN samples were tested in air and 5 vol%H2/Ar. The results show that the conductivity of LSCN in 5 vol%H2/Ar (8.12 Scm-1) at 850 °C was higher than that in air (7.03 Scm-1). Th…
Barium zirconate titanate ceramics were prepared by microwave sintering. Effects of microwave sintering time at 2.5kW on microstructure, dielectric and ferroelectric properties of barium zirconate titanate ceramics have been investigated. The result shows that the ceramic samples sintered at 2.5kW for 15~30min are sin…