Materials Literature
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The evolution of microprocessor architectures has driven semiconductor manufacturers making transition from ceramic to organic package substrate technology in order to take full advantage of the silicon advances. However, large mismatch in coefficients of thermal expansion (CTE) between silicon die and organic substra…
Small indications were found in one replacement reactor pressure vessel head (RPVH) mock-up being fabricated from Alloy 690 material and compatible weld metals, Alloy 52/152. The mockups were non-destructively examined and the lowest number of cracks found was five and the highest number was 22. There are numerous ind…
Electrochemical etching of NiTi alloy in a pH 6 fluoride solution is proposed as a convenient, less dangerous procedure than traditional chemical etching in oxidizing HF media. Anodic polarization produces protons at the electrode surface, and local acidification increases the concentration of HF that efficiently diss…
(Ba1 − x Ca x )6Nb2O11 solid solutions were synthesized. The compositions were shown to be single-phase at 0.23 ≤ x ≤ 0.47 and have a double perovskite cubic structure with an incomplete oxygen sublattice. The interaction of solid solutions with water vapor and their electrical properties were studied. In dry atmosphe…
A pressure-induced phase transition and stability in Si 2 CN 4 polymorphs under high pressure are studied by first-principles calculations. The result shows that the phase transition pressure of α- and β-Si 2 CN 4 to the cubic spinal phase is 29.9 GPa and 27.5 GPa predicted by thermodynamic method respectively. Under…
Ford Motor Company has been researching for natural fibres applications in vehicles since the 1930s. Targeting large volume production, the material supplier AFT has been working to develop composites with focus on injection moulding. To ensure the quality of natural fibres composites, AFT works on controlling the des…
In this study, porous alumina green bodies were formed from alumina slurries by simultaneous thermal gas generating and thermal slurry solidification. In order to cause simultaneous thermal gas generating and thermal slurry solidification, NH4HCO3 and potato starch were used as a gas generating agent and a gelatinizin…
A hybrid simulation of coarse-grained molecular dynamics (MD) simulation and self-consistent field (SCF) calculation has been conducted to examine the structure and strength of a polymer interface reinforced with block copolymers. We studied the interface of A-homo/AB-diblock/B-homo polymer systems, in which the B blo…
Results of dielectric response measurements in frequency domain at various temperatures have been presented for oil impregnated paper samples unaged and thermally aged containing various amounts of moisture. The obtained results were used for defining respective master curves and activation energies. Discrepancies of…
Aromatic polyamides with azomethine groups present in the polymer with –Cl, –OCH3, –N(CH3)2 and –OH substitutions in the pendent benzylidene rings were synthesized through polycondensation of new aromatic dicarboxylic acids with aromatic diamines using the phosphorylation technique in DMF. Direct polymerization of the…
The continuous measurement of loads and displacements during nanoindentation of shape memory alloys allows a detailed investigation of pseudoelasticity on the nano-scale. However, the resulting load-displacement data simultaneously reflect several elastic and inelastic deformation processes (i.e., stress-induced marte…
This study investigates the fabrication of a stable superhydrophobic surface with low contact angle (CA) hysteresis using ZnO thin films prepared by cathodic electrodeposition and subsequent gaseous oxidation. The deposition time is a crucial factor in nanostructuring and producing surface roughness of the films. Cath…
Ti-Zr binary metallic wires without toxic elements were developed by an arc-melt-type melt-extraction method for potential application as biomedical materials. The Ti-Zr binary alloy showed high wire forming capability during the melt-extraction process, independent of the Ti concentration. Therefore, it was possible…
Polyelectrolytes exhibit an enhanced solubility (compared to their uncharged counterparts) due to the dissociation of counterions into the polar medium. Polyelectrolyte solutions can nevertheless become unstable, and display microphase and macrophase separation if the solvent is bad for the polyelectrolyte backbone. I…
The influence of some arylazo indole derivatives on the corrosion rate of 70/30 -brass in 2 mol l -1 HNO 3 was investigated using weight loss and galvanostatic polarization techniques. It was found that the investigated compounds behave as inhibitors. The inhibition efficiency increases with increasing the inhibitor c…
The present work describes the anodic growth of self-organized TiO2 nanotubes (TiNT) on titanium samples in an electrolyte containing 3% NH4F and 5% H2O in glycerol. Two stages anodization were proceeded. Initially, the potential was ramped from 0V to 30, 40 and 60 V. In the second stage the potential was held at the…
The effects of zinc insert and Al content in Mg alloy on the bondability in steel/Mg alloy joints were evaluated using SEM, EDX, XRD and tensile test. A cold rolled steel plate (SPCC), a zinc coated steel (GI), Mg-3mass% Al alloy (AZ31) and Mg-6mass% Al alloy (AZ61) were used in this study. The bondability of the join…
Three competing defect configurations of Li-doping of MgO on the (100), (110) and (111) low index surfaces have been investigated using GGA + U. The three configurations investigated on each of the surfaces were: substitution of Li for Mg with the formation of a compensating oxygen hole state ([Li'Mg—O•O]), substituti…
Several ecological and morphological groups of benthic organisms, and also allochthonous algae incoming from plankton and periphyton, were found in microphytobenthos. Ecological characteristics of algae occurring in benthic algae communities are considered.
The effects of applied pressure, pouring and die temperatures on the macrostructure of a squeeze-cast Mg-2.5 mass%Nd alloy were investigated. The grain size of the Mg-2.5 mass%Nd alloy increased with increasing applied pressure from 60 to 180 MPa when the pouring and die temperatures were 725°C and 330°C. This was att…