Materials Literature
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Abstract In this work, MoSi 2 – ZrO 2 -composites with different volume fractions (15-, 25-, 35 vol.% ZrO 2 ) were examined. Zirconium oxide was successfully tetragonal stabilised (metastable state) through a high temperature isostatic pressure process, where the tetragonal – monoclinic phase transformation is inhibit…
Shape recovery in iron‐based shape memory alloys is known to be incomplete. Thermomechanical cycling or training is recognized to improve the shape memory effect. In the present work, different aspects of training are studied: the number of cycles, the amount of deformation and the annealing temperature. As the number…
The actual occupancy of the two available cation sites by luminescent Eu 3+ ions, in the cubic bixbyite-type structure of nanocrystalline sesquioxides, has been investigated by 151 Eu Mössbauer spectroscopy and magnetic susceptibility measurements. It was found that one fourth of the europium ions is in the more symme…
There is several basic classes of recycling methods for FRP boats. The main one is mechanical recycling that is one of the simpler and more technically proven methods. It recently has been reported that FRP can be recycled by separating into laminated glass-fiber layers instead of crushing into powder. These mechanica…
The reaction of 30% solutions of TBP in hexachlorobutadiene (HCBD) with dissolved HNO 3 at its initial concentration of 1.2 M was studied in the range from 90 to 150°C. The kinetic parameters of HNO 3 consumption, gas release, and accumulation of dibutyl hydrogen phosphate were determined. The boundary temperature con…
The results of a study on the thermal dissolution of rubber crumbs and tire reclaim in mazut in the presence of ordinary shale from AO Leningradslanets (Slantsy) and high-sulfur shale from AO Slanets (Syzran) are reported. It was found that both rubber crumbs and tire reclaim were completely dissolved in the presence…
Autogenous gas tungsten arc welding to produce a dissimilar weld comprising austenitic and ferritic stainless steels was attempted. Defect free welds with over matching mechanical properties could be accomplished with a resultant weld metal consisting of a dual phase structure (ferrite and austenite). The pitting corr…
Ceramic samples of lead magnesium niobate (PMN) and (1 − x )Pb(Mg 1/3 Nb 2/3 )O 3 − x PbTiO 3 (PMN-PT) solid solutions with x = 0, 0.05, 0.10, and 0.30 have been prepared by solid-state reactions, and their structural, electrical, and piezoelectric properties have been studied using x-ray diffraction, Rietveld profile…
The relationship between base layers beneath a Ni catalyst and carbon nanofiber (CNF) growth was investigated at a deposition temperature of about 480 °C using a direct-current plasma-enhanced chemical vapor deposition system. Amorphous carbon was deposited on some base layers such as Pt, Ni, Cr, and W, while CNFs wer…
The paper deals with synthesis of nanocrystalline La 0.7 Sr 0.3 Mn O 3 (LSMO) and BaTiO 3 (BT) powder via hydroxide co-precipitation route. The particle size of the powder is determined using Williamson Hall method and is observed to be nearly 35 nm for LSMO and 120 nm for BT. To avoid occurrence of impurity phases th…
Partial Discharge (PD) signals character analyzing and interference suppressing are very important for PD on-line measurement. In this paper, chaos theory is introduced in the PD on-line monitoring. The mechanism of PD phenomena has been researched by series of typical insulation defect PD experiments in the lab. Thro…
A substantial internal friction peak associated with the liquid-liquid transition (Tll) has been observed in polystyrene (PS) melts with different molecular weights Mw. The peak is of the relaxation type and suggested to be caused by the cooperative rearrangement of PS chains. The relaxation time follows the Vogel–Ful…
Time-domain behavior of carbon nanotubes as the future candidates for interconnects is of great importance. In order to analyze an entire circuit containing carbon nanotube interconnects, we need to have an electrical circuit model for carbon nanotubes as well as the rest of the system. Several studies have demonstrat…
Abstract The galvanic compatibility of aerospace aluminum alloy AA7075 with cadmium (Cd), zinc (Zn), and zinc–cobalt–iron (Zn–Co–Fe, 32–37%Co and 1%Fe) alloys was investigated. A comparison of open circuit potential [OCP vs. saturated calomel electrode (SCE)] measurements in 0.6 mM NaCl showed that all coatings would…
The wear resistance and damping capacity of hypoeutectic grey cast iron (carbon equivalent =3·59%) were investigated as a function of the relative amount of primary fraction of solid. In the present study the authors have used a cooling plate to produce semisolid iron slurry. Sand mould castings with 14 mm strip thick…
The phases and magnetocaloric effect in the alloys (Gd1−xNdx)Co2 with x = 0, 0.1, 0.2, 0.3, and 0.4 were investigated by X-ray diffraction analysis and magnetization measurement. The samples are single phase with a cubic MgCu2-type structure. The Tc decreases obviously with increasing Nd content from 404 K of the allo…
Convergence will have an effect on every aspect of an enterprise. Exactly what is convergence and how will we get there? This paper examines how new technologies have traditionally entered the workplace, how this process is changing and the implications for enterprises as they enter a new world of converged communicat…
Shock testing of aerospace vehicle hardware has presented many challenges over the years due to the high magnitude and short duration of the specifications. Recently, component structural failures have occurred during testing that have not manifested themselves on over 200 Space Shuttle solid rocket booster (SRB) flig…
Kurzfassung Der Einsatz von Kühlschmierstoffen ist in der spanenden Fertigung der Metall verarbeitenden Industrie gängige Praxis. Sie vermeiden ein Überhitzen von Werkstück und Werkzeug, reduzieren die Reibung und befördern den Spantransport. Wassergemischte Kühlschmierstoffe unterliegen in der Anwendung einer mikrobi…
A method for preparing hyperbranched poly( L -lysine) via the polymerization of N ɛ -carbobenzoxy- L -lysine- N -carboxyanhydride has been developed in order to regulate the molecular mass and size of this polymer and to modify amino groups of its N -terminal lysine residues. This method includes the reductive removal…