Materials Literature
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This paper deals with the sintering behaviour of Barium Strontium Titanate (BST). Two methods were examined; method 1: BaTiO3 + SrTiO3 source powders; method 2: BaCO3 + SrCO3 + TiO2 source powders. Commercially available 50 nm BST (x = 0.60) powder was used to investigate the effect of particle size on activation ener…
Glare is the name given to a new material for aircraft structures developed at Delft University in the Netherlands. It consists of thin aluminium layers bonded together by adhesive containing embedded
Single crystals of Li 2B4O7 doped with Mn 2+ (0.014 mol. %) and Li 2B4O7 glasses doped with Mn 2+ (0.1 mol. %), have been investigated using EPR method at 9.4 GHz after two years from the growth. In both systems the Mn ion is found enter substantially for the Li + ion as Mn 2+ and/or Mn 1+ , and, probably for the B 3+…
Inyoite was found as fissure fillings in calcium borate minerals, which occur as an irregularly shaped body in the crystalline limestone near the gehlenite-spurrite skarns at the Fuka mine, Okayama Prefecture, Japan. Inyoite occurs as aggregates of tabular crystals up to 1 mm wide, and rarely as euhedral crystals up t…
Depolymerization of polycarbonate in critical region of methanol was studied in absence of catalysts and in a batch-type autoclave at reaction temperature of 220—260℃ and with reaction time of 5—45?min. The main liquid products were demethyl carbonat (DMC) and bisphenol-A(BPA), which were identified and quantified by…
An examination was carried out on the quantitative analysis of bound rubber in silica-filled rubber systems by a thermal gravimetric analyzer (TGA), transmission electron microscopy (TEM) and pulsed NMR. The bound rubbers in solution mixed composites were primarily composed of filler gel which corresponded to the entr…
ALZETA Corporation has developed surface-stabilized fuel injectors for use with lean premixed combustors which provide extended turndown and ultra-low NOx emission performance. These injectors use a patented technique to form interacting high-flow and low-flow flame zones immediately above a selectively-perforated por…
The corrosion behavior of Si3N4 SiC, mullite, alumina and sapphire was investigated in supercritical water at 450°C and 45MPa for 2 to 50h. Corrosion resistance for the ceramics was as follows in the order; Si3N4<SiC<mullite<alumina<sapphire. Pitting corrosion with formation of amorphous layer and intergranular corros…
Thin films of ZnO were deposited on glass slides from aqueous solutions of zinc sulphate in which ammonium solution and TEA were employed as complexing agents. The film was studied for its optical properties using measurement from a Unico UV-2102 PC spectrophotometer, at normal incidence of light in the wavelength ran…
The paper describes the preparation and characterization of nano-size metastable tetragonal CeO 2 –ZrO2 mixed oxides prepared by a polymerized complex method. A glycine–ethylene glycol solution containing Ce 3+ and Zr 4+ ions was polymerized at 80–110 °C to form a viscous transparent resin without any visible precipit…
Hollow capsules have been prepared by electrostatic layer-by-layer self-assembly of tetrasulfophthalocyanine iron [Fe(PcS4)] in alternation with poly(diallyldimethylammonium chloride) (PDDA) onto the precursor shells with well-defined internal volumes. The resultant linear deposition process was monitored by UV/Vis ab…
High temperature oxidation and oxidation-induced embrittlement in β-silicon carbides (SiCs) with different grain boundary microstructures have been studied. SiCs with different grain boundary microstructures were fabricated by hot-pressing with different doping elements like Mg, Al, P. Oxidation experiments were carri…
Cerium monosulfide (CeS) powder was synthesized by the reduction of Ce 2 S 3 powder with metallic Ce, which was obtained from ceria (CeO 2 ) powder using carbon disulfide (CS 2 ) gas. To obtain the maximum amount of CeS from a mixture of Ce 2 S 3 and Ce, an excess amount of metallic Ce, a stoichiometric composition, w…
Electrochromic properties of sputter-deposited nickel-based oxide films have been studied with a two-fold goal. From a practical point of view, the optical switching performance has been improved by optimizing the deposition conditions and film stoichiometry with respect to oxygen and hydrogen, and further by adding M…
Phase change in a simulated low gravity environment is the central topic of this research work. The application of a transverse magnetic field gives rise to Lorentz forces that can dampen the convective flows especially the buoyancy driven flows. The flow suppression depends on a dimensionless parameter namely the Har…
Chromium dissolution in aqueous sulfuric acid solutions in the pH range 0.5 ?3 was studied electrochemically by the potentiostatic or very slow potentiodynamic method, and by the analyses of the Cr ion concentrations in the electrolyte formed during the experiments. It was shown that the electrochemical anodic dissolu…
Ductile iron specimens of ∼3.5 mass% C and ∼2.8 mass% Si were austempered at 420°C for 0.5 h∼24 h. These upper bainitic austempered ductile iron (ADI) specimens were 90° -eroded by Al2O3 particles of ∼275 μm grit size under the average particle velocity of 73 m·s−1 to understand phase transformation at the erosion sur…
The crystal structure of a new polymorph, Form II, of β-D-allose has been determined by X-ray powder diffraction. The unit cell is hexagonal, a = b = 16.598 Å, c = 4.856 Å, α = β = 90°, γ = 120°, space group P62 with Z = 6, Z′ = 1. The molecule adopts the 4C1 chair-conformation, with a torsional change of conformation…
Amperostatic coulometry was applied for the thickness measurement of Sn-Ag hot dip coatings, which comprise an extended Sn-Cu interdiffusion layer. Complementary measurements, notably weight loss, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, X-ray fluorescence (XRF), and dynamic secondary io…
Dependence of fracture properties and hardening was examined as a function of helium production in tensile specimens of a martensitic steel F82H (Fe-8Cr-2W-0.1C-0.04Ta) irradiated at 300°C to 2.3 dpa by neutron irradiation in the JMTR (Japan Materials Testing Reactor). The specimens used in this study were F82H, F82H+…