Materials Literature
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Abstract The composition and structure of heavy‐duty diesel engine piston deposits generated in a Caterpillar 1Y540 single‐cylinder bench test engine according to the Caterpillar 1N test procedure have been investigated using infrared spectroscopy, x‐ray diffraction (XRD), x‐ray photoelectron spectroscopy (XPS), XPS d…
Abstract A static ultrasonic treatment device was used to investigate the effect of ultrasound on devulcanization of unfilled SBR disks in the absence of shearing effect. Some visible bubbles were observed at the center of the disk sample at low pressure, as well as at the edges at high pressure, as the treatment time…
A new method has been developed to determine the misfit of disc-shaped precipitates in a matrix using transmission electron microscopy (TEM). The method is applicable to specimens containing a high precipitate density, where the classical TEM method, based on the extent of the precipitate diffraction contrast cannot b…
Time-stepping finite-element methods have been widely used to compute the magnetic field of electrical machines. Because the reluctivities of magnetic materials are nonlinear, the finite-element equations have to be solved iteratively. In this paper, an effective method for reducing the computing time of the Newton-Ra…
A temperature scanning attachment for the polarizing microscope is described that offers a simple but powerful technique with which to detect even subtle paramorphotic phase transitions in liquid crystals with high temperature resolution. This technique was applied to CE8, a well known reference compound exhibiting ri…
Preparation and dielectric characterisations of a great number of TTB-type ceramics have allowed us to show that some of them present relaxor behaviour, due to the occupation of the same crystallographic site by two different cations or anions. One of the cation in the octahedral site has to be ferroelectrically activ…
Mesoporous niobium oxide was treated at room temperature with bis(toluene) niobium to make a new black material that exhibits metallic properties. The metallic behavior is attributed to low-valent NbII in the walls of the porous structure and is fully supported by strong emissions at the Fermi level, variable temperat…
Selected thiosemicarbazides of fatty acids with C11-C18 carbon atoms were synthesized and evaluated as corrosion inhibitors of mild steel (MS) in 1 N hydrochloric acid (HCl) and 1 N sulfuric acid (H2SO4) by weight loss and potentiodynamic polarization methods. The values of activation energy and free energy of adsorpt…
Alternative conversion coatings designed to replace chromate conversion coatings (CCC) are typically compared to laboratory-prepared CCC with regard to stand-alone corrosion performance. This study seeks to determine the stand-alone corrosion resistance of field-applied CCC to establish a more realistic benchmark for…
An effort was made toward modifying the Si 3 N 4 ‐SiC phase ratio in bulk nanocomposites obtained from polymer precursors. While pyrolyzing the polymer, flowing ammonia was introduced, to facilitate a chemical exchange, resulting in a different C/N ratio in the ceramic pyrolysis product. A pre‐pyrolysis/binding/pyroly…
Abstract— Almost two‐thirds of the discharge cells in plasma‐display panels (PDPs) are covered with phosphors. Beyond the efficient conversion of vacuum UV photons into visible light, the phosphor layer serves as a reflective mirror transporting light in the desired viewing direction. The quantum efficiency of state‐o…
Submicrometer hollow CuS, CdS, and NiS spheres with diameters between 400 and 1300 nm were successfully prepared through an interface-mineralizing reaction in a NH 3 ·H 2 OCS 2 solution at low temperature. Several techniques were applied to characterize the interesting self-assembled structures. The compositions of t…
A cyano-bridged nickel(II) compound, [NiL][Ni(CN)4]·4H2O (L = 3,10-diethyl-1,3,5,8,10,12-hexaazacyclotetradecane), was prepared and characterized. Single crystal X-ray analysis reveals that the compound assumes a cyano-bridged chain structure in which one nickel(II) ion is coordinated by four cyanide ligands and the o…
The preparation of near stoichiometric spinel and alumina‐rich spinel composites from Al 2 O 3 and MgO powders with the addition of Na 3 AlF 6 up to 4 wt% in the temperature range 700°–1600°C was studied; 98 wt% spinel containing 72 wt% Al 2 O 3 can be produced from the mixture of 72 wt% (50 at.%) Al 2 O 3 + 28 wt% (5…
Dielectric potting materials (encapsulants) are used to prevent air breakdown in high-voltage electrical devices. We report breakdown strengths in void-filled encapsulants, stressed with unipolar voltage pulses of the order of 10 μs duration. High strengths, on the order of 100 kV mm−1, are measured under these test c…
Deformation of shape memory alloys via detwinning of thermally formed martensite twins is a unique microstructural process, which leads to a macroscopic stress plateau in the stress-strain curves. Since this type of deformation mechanism involves insignificantly the dislocation processes, the original shape of the sha…
Wasserfreies Natriummonothiophosphat(V) Na3PO3S wurde auf einem neuen Weg durch Gefriertrocknung des Hydrates und anschließendes Tempern dargestellt. Die Kristallstruktur wurde aus Röntgen- und Neutronenpulverdaten bestimmt. Dabei wurde das Strukturmodell durch kombinierte Optimierung der Differenz zwischen berechnete…
The Auger parameter in vapour-deposited Mg-Ti alloys (Mg-4.2 at.% Ti, Mg-7.6 at.% Ti, Mg-15.1 at.% Ti, Mg-20.7 at.% Ti, Mg-25.3 at. % Ti and Mg-30.2 at.% Ti) has been measured using high-energy X-ray photoelectron spectroscopy with a Cr Kβ (hv = 5946.7 eV) X-ray source. The charge transfer occurring upon alloying was…
A method for the synthesis of 3,4-dihydro-3-pentafluorophenyl-2H-1,3-benzoxazine in a high yield derived from pentafluoroaniline is described. This fluorinated benzoxazine monomer has been developed as a potential precursor for a polybenzoxazine in electronic applications as well as others taking advantage of the low…
An isotactic polypropylene was modified with specific α - phase and β - phase nucleation agents. The modification by processing during extrusion was realised by means of molten state elongation with various stretching ratios λ, between 7.11 and 1.67. The lamellar thickness distribution was evaluated for non-elongated…