Materials Literature
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A cold crucible is useful for contactless melting of metals. Metals and alloys can be refined to high degrees of purity with cold crucibles. The construction of a crucible strongly influences the melting conditions of molten metal. In this paper, crucible construction is examined in experimental investigations and ele…
Pitting Corrosion behaviour of commercial stainless steels (SS) types 904L and 316L has been investigated in pure sodium chloride solutions of different pH values and at different temperatures.Potentiodynamic polarization technique and scanning electron microscopy were utilized. The results indicated that pitting corr…
Single crystals of the metastable phase of KCOPO4 (α-KCP) have been synthesized in a gel of tetra-methoxysilane. The crystals have a hexagonal symmetry which belongs to space group P63 (cell parameters a = 18.206(1), c = 8.5135(8) [Å] and Z = 24). The crystals have been characterized by x-ray diffraction and by polari…
A two‐stage lights‐gas gun has been used to impact thin zinc bumpers by zinc projectiles over the velocity range of 2.4 km/s to 6.7 km/s to determine the propagation characteristics of the impact generated debris. Constant‐mass projectiles in the form of spheres, discs, cylinders, and rods were used in these studies.…
Hugoniot elastic limit and indentation hardness data are provided for selected high‐strength ceramics. The degree of correlation of the strength data by the two test methods is examined. The influence of deformation mechanism on the strength measurement, including rate sensitivity, size scale and confining pressure, i…
Hydrogen permeation characteristics of Pd-coated membranes of V-Mo alloys (10-50 at.% Mo) have been investigated using the gas permeation technique in the temperature range 423-673K. Hydrogen solubilities of the alloys have been determined using a volumetric method in the temperature range 473-673K. The Pd-coated memb…
KEYWORDS: catalysissilver-impregnated silica gelmethyl iodideiodineadsorbentsadsorptionnitrogen dioxidefuel reprocessing
Carbonatites are igneous rocks formed in the crust by fractional crystallization of carbonate-rich parental melts that are mostly mantle derived. They dominantly consist of carbonate minerals such as calcite, dolomite, and ankerite, as well as minor ...Read More
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Abstract A series of synthetic garnets solid solutions is compositions between Y 3 Al 2 Al 3 O 12 (Y‐Al garnet) (YAG) and Ca 3 Cr 2 Si 3 O 12 (uvarovite) was synthesized using the sol‐gel method. The expected general formula is (Ca x Y 1‐ x ) 3 (Cr x Al 1‐ x ) 2 (Si x Al 1‐ x ) 3 O 12 where x = 0 to x = 1. The cation…
Using a false twister for hollow spindle wrap yam spinning is supposed to facilitate operations. However, our investigation shows that a high level of false twist can sig nificantly influence yarn appearance and mechanical properties. Wrap yarn spun with a false twister has a tortuous structure, while wrap yarn spun w…
Abstract Synthesis and properties of urethane elastomer‐modified epoxy resins were studied. The urethane elastomer‐modified epoxy resins were synthesized by the reaction of a 4‐cresol type epoxy compound having hydroxymethyl groups (EPCDA) with isocyanate prepolymer. The structure was identified by IR, 1 H NMR and GPC…
X-Ray diffraction studies have been made of the crystalline luminescent material Na+–Er3 +β″-alumina for three different erbium ion concentrations; equivalent to 100, 72 and 26% substitution of Na+ ions (Na1+y–3xErxMgyAl11–yO17, for x= 0.56, 0.40 and 0.14, respectively, and y= 2/3). The results form thereafter a struc…
The variation of magnetic and loss characteristics of nonoriented silicon-iron sheets with frequency and temperature under sinusoidal magnetic flux-density conditions have been investigated using an Epstein frame. The investigations have made it possible to model the variation of iron loss with frequency and magnetic…
The solid-state conductivity, σ, has been determined for cyanophenyl paraquat (CPQ: 1,1′-bis(p-cyanophenyl)-4, 4′-bipyridilium), for salts containing dication and radical cation redox states and for mixtures of the two. A plot of σvs. mole fraction of CPQ+ showed a maximum corresponding to a composition [CPQ2+(CPQ+)2(…
Non-ionic amphiphilic compounds—butane-1.2,3-triol derivatives, 2-hydroxycarboxylic acids and carboxylic acids—incorporating rigid aromatic structural units like 1,4-disubstituted benzene, 4,4′-disubstituted biphenyl or the 2-phenyl-1,3,4-thiadiazole have been prepared. In most cases these compounds exhibit smectic li…
For identification of how explosion increases the reactivity of chitin and chitosan, changes in the crystalline polymorphism of these polysaccharides were studied by X-ray diffraction measurements. The α-chitin form of chitin did not change after being exploded, but an X-ray diagram of chitosan showed a hydrated cryst…
Vacuum ultraviolet(VUV) irradiation (wavelength 147 nm) of siloxane polymers in the presence of air was studied using ATR FTIR and XPS spectroscopy. The ATR FTIR study revealed the formation of CO and OH groups in the surface layer depending on irradiation time and air pressure. The concentrations of CO and OH groups…
The fast measurement of furrows or wrinkles requires the use of a non-contact device. We have chosen a laser detector based on a triangulation principle, using position-sensitive detectors. This apparatus has a sensitivity of about 2-3 microns for a vertical range > 1 mm; this vertical range can reach 8 mm. There is n…
Ultramafic materials weather rapidly to maintain relatively high saturation with exchangeable Mg, and they have very high Fe and high Mn contents. These features retard the translocation of humus compounds, which is essential for podzolization. Three soils in a range of ultramafic materials were sampled to relate thei…