Materials Literature
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Abstract Digital image acquisition is of great interest in SEM, as can be proven by the number of ways in which images can be improved by processing with this technique ( Desai and Reimer 1985, Hawkes 1981). In the case of the system described here, this interest is enlarged by the facility of storage and retrieval of…
Abstract The effect of the P‐content in iron (0.002‐0.12% P) and the stirring rate on the corrosion rate of five Fe‐P alloys in H 2 SO 4 and HCl solutions (pH = 0) has been investigated. It was assumed that phosphine generated during corrosion process acts as a stimulator of the cathodic process (at low concentrations…
Relations between the interfacial and the chemical-structural features of oxides are of concern in several fields. Ferrites appear as a particularly suitable system as they allow gradual changes in composition while avoiding complications from structural modifications. A family of iron(II) cobalt ferrites (CoxFe3–xO4,…
Abstract Lattice constants of the monoclinic form of polyethylene under pressures up to 1.8 GPa at 298 K are investigated by x‐ray diffraction. The thermal expansion from 100 K to 300 K at atmospheric pressure is also studied. The equation of state is calculated by Pastine's method, taking into account the zero‐point…
Improving an experimental technique previously used for smectite synthesis, pure Ni or Mg lizardites, and substituted (Mg-Ni) lizardites, have been synthesized between 25 and 200 °C. At low temperature (25 °C), synthetic clays are very hydrated and poorly crystallized. With increasing time and temperature of experimen…
The mechanism of corrosion of stainless steels in highly concentrated sulfuric acid was studied by the electrochemical method and surface analysis as EPMA and Laser-Raman Spectroscopy. Cyclic potential changes occured in this system about between -0.2V (SCE) (active state) and 0.2V (SCE) (passive state). The anodic re…
The objective of this paper is to review some of the basic properties of polyester adhesives, the types of bonds that can be made with them, and some of their more important end-use applications. In general, these polymers are crystallizable tere phthalate copolyesters containing one or more dibasic acids and one or m…
P 3 Se 4 I is formed by the reaction of molten P 4 Se 3 and I 2 . P 3 Se 4 I is monoclinic, space group P2 1 /c with the lattice parameters of a = 1130.3(3) pm, b = 654.5(2) pm, c =1420.5(4) pm, β - 117.64(2)°. d = 3.87 g cm -3 and d x = 3.82 g cm -3 for Z = 4. The structure of the molecule is derived from the structu…
Quenched phason strains in an Al-Mn-Si icosahedral quasicrystal have been examined by high resolution electron microscopy with particular attention to their orientation relationship with the growth direction of quasicrystal. It is revealed that linear phason strains appear almost perpendicularly to the growth directio…
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Progress in the synthesis and crystal growth of high optical quality KH2PO4 is reviewed. Large crystals have been grown at rates exceeding 15 mm day−1. KH2PO4 has been used to study fundamental crystal growth kinetics and is contributing to the understanding of growth mechanisms. The growth of KH2PO4 has been shown to…
A novel analytical approach to predict eddy current losses in large power transformer walls is proposed. Based upon the knowledge of the incident flux to the rectangular plate, a curve fit to a double Fourier series is obtained. This closed formula representation is used to solve directly Maxwell's diffusion equation…
Repassivation potentials, ER, CREV, for metal/metal-crevices of 54 kinds of stainless steels were measured in 3% NaCl solution at 80°C. Obtained ER, CREV values were analysed in relations to chemical compositions of the 52 steels into multiple linear regressions in the form of Y=b0+∑bjXj for every one of steel groups,…
The investigation of adhesion promoters prepared by the reaction of amino-functional silanes with dianhydrides (or diester-diacid chlorides) of tetracarboxylic aromatic acids is reported. The new coupling agents, designed to exhibit superior thermo-oxidative stability were applied under conditions determined from kine…
Addition of molybdenum compounds to silica-supported platinum catalysts results in an increase of their activity for methanol formation. The location of the promoter has been studied and it is suggested that the molybdenum oxide partly covers the Pt surface. The respective roles of Pt and Mo in methanol formation are…
Abstract Dodecenyl succinic anhydride (DDSA), a liquid anhydride curing agent for epoxy resins, was synthesised from C 12 olefin and maleic anhydride by the “ene synthesis” reaction. C 12 olefin was prepared by the dehydration of lauryl alcohol using Al 2 O 3 (acidic) catalyst. The dehydration was carried out in a flo…
Castable polyester polyurethane elastomers (PU's) based on the system polycaprolactone diol (Capa 225)/trans 1, 4–cyclohexane diisocyanate (CHDI)/1,4 butane diol (1,4–BD) were synthesised to study the effect of various polyol-diisocyanate block ratios on thermal stability. The influence of mixed diisocyanates on therm…
The microstructure and mechanical properties of commercial pure titanium (CPTi) and Ti-6Al-4V alloy joints brazed with newly developed Ti-base amorphous filler metals have been investigated by microscopy, electron probe microanalysis, tensile test, fatigue test and salt immersion test.The developed amorphous filler me…
The synthesis, structures, and solid state properties of salts of general stoicheiometry [C]n+[A]n–, where C indicates a cluster cation and A represents a cluster anion, are described.
The crystal structure of the complex [(H2O)4Cu(cdta)Ni]·3H2O (1)(cdta =trans-cyclohexane-1,2-diamine-NNN′N′-tetra-acetate) has been determined by X-ray methods. It crystallizes in the triclinic space group P with Z= 2 in a cell of dimensions a= 8.685(4), b= 11.415(6), c= 12.841(4)Åα= 96.43(4), β= 96.60(3), γ= 102.23(6…