Materials Literature
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<div class="htmlview paragraph">This study compares the hot corrosion resistance of several internal combustion engine exhaust valve alloys in a simulated diesel engine environment. Hot corrosion of exhaust valves occurs when deposits accumulate on the head and are subjected to temperatures between 650 to 1000°C…
Abstract We report computer simulations of the adsorption process of water on a platinum (100) surface. At very low impact energies the sticking coefficient approaches unity in agreement with experimental evidence. The sticking coefficient for the bare surface decreases strongly with increasing impact energy already i…
Abstract The structure and properties of dynamically cured ethylene‐propylene‐diene terpolymer (EPDM) and ionomer blends have been studied. The blends were prepared in a laboratory internal mixer, where EPDM was cured under shear in the presence of ionomer with dicumyl peroxide (DCP) under different shear conditions.…
This experiment allows students taking inorganic chemistry, electrochemistry, corrosion science, physical chemistry, or material science to observe and analyze the effect of the electric potential, the pH, and the concentration of the aggressive ions have upon the corrosion, passivation, and pitting of an iron electro…
Die Ausbildung und Beeinflussung von Aluminiumoxiden bei Reoxidation wurden in Laborschmelzen mit einer kombinierten Sauerstoff‐Meß‐ und Dosierzelle untersucht. Die Konzentrationsgrenzen und die Stoffstromdichten, die für die Bildung bestimmter Einschlußformen bestimmend sind, wurden in vordesoxidierten Proben ermitte…
The solubility of sparingly soluble compounds, particularly when they are present in the finely dispersed state, is difficult to measure, especially at elevated temperature and pressure. To date there have been no simple methods of determination. A quick and very simple method is now presented, termed ‘solubility titr…
The mechanical and thermal properties of Si 2 N 2 O/SiC‐whisker composites were studied with emphasis on the effect of matrix composition and of whisker content. The fracture toughness of Si 2 N 2 O was remarkably improved by 90% with a concomitant 70% strength improvement by addition of SiC whiskers of only 10 vol%.…
The wrinkling of garments is analyzed by deforming a fabric cylinder in axial compression. The buckling process and characteristics of such a cylinder in axial compression are explained in detail. It is obvious that the buckling pattern generated in knitted fabrics is different from that in woven fabrics: the pattern…
The compound YNbO 4 is a 3–5 analogue of ZrO 2 with two polymorphs: low‐temperature monoclinic and high‐temperature tetragonal forms. YNbO 4 powder with a surface area of 40 m 2 /g was prepared from citrate complexes. The powder sintered to theoretical density at 1550°C. Unlike pure ZrO 2 , YNbO 4 can be cooled throug…
Abstract 197Au Mössbauer spectroscopy has been applied for the low-temperature β-phases of ternary systems, Ag2−xAuxX (X = S, and Se; x = 0.2 and 0.5). The nature of linear X–Au–X bonds present in these systems is discussed on the basis of the Mössbauer data and the bond distances.
Abstract New photoactive polymers containing benzoin or benzil groups have been prepared by condensation of terephthalaldehyde. The influence of the alkali metal ions and solvents used upon the progress of polycondensation and yield of poly(benzoin) Systematic name: Poly(1,4‐phenylene‐1‐hydroxy‐2‐oxoethylene). were st…
Abstract Specific features of development of micro‐ and macrofibrils as well as the structure of their interfaces are considered for oriented filaments of high‐density polyethylene with different initial supermolecular structures. As evidenced by SAXS, WAXS, EPR, Raman spectroscopy and electron microscopy, the melt‐cr…
The influence of organic fertilization on the increase of cation exchange capacity in calcareous soils is studied. Two soils with illite and interstratified illite-montmorillonite clay fractions, respectively, were fertilized with sheep and chicken manures and submitted to culture conditions during 3 years. The evolut…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of fluorinated polysiloxanes. 8. Properties at low and high temperatures of polysiloxanes with fluorinated graftsB. Boutevin and B. YoussefCite this: Macromolecules 1991, 24, 3, 629–632Publication Date (Print):February 1, 1991Publication History Published online1 M…
Abstract Isochoric thermal conductivity and thermal pressure are studied of monoclinic and rhombohedral phases of solid CCl 4 at different densities in the temperature range 210 to 300 K and up to the pressures of 200 MPa. It is found that at constant density the thermal conductivity increases with increasing temperat…
Niobium pentoxide (T form, orthorhombic system) was utilized to promote devitrification in Li 2 O · Al 2 O 3 · 6SiO 2 glasses. Two or more mole percentage of this nucleating dopant enhanced crystallization in these glasses. Glasses containing 4.0 and 8.0 mol% T‐Nb 2 O 5 exhibited a high tendency to form dispersed TT‐N…
Abstract The possibility of wood charcoal as an adsorbent, not as an energy source as in the past, was confirmed by the use of an anionic surfactant as the model adsorbate, and a trial sorption of polluting substances in an actual river by a wood charcoal column was conducted.
A new method for analyzing the cation distribution of spinel crystals by extended X‐ray absorption fine‐structure spectroscopy has been developed to overcome the disadvantage of X‐ray diffraction, which cannot readily distinguish among different transition‐metal ions. EXAFS analysis was conducted on Ni 2+ and Fe 3+ io…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of iridium carbonyl cluster complexes. Synthesis and x-ray crystal structure determination of the [NMe3(CH2Ph)]3[Ir9(.mu.-CO)7(CO)13] complex containing a cofacial bioctahedral iridium cluster. Another example of different electron counting between isoskeletal rhod…
In the B phase of a chiral epoxy compound and its mixtures with an achiral liquid crystal material, a sign reversal in the electroclinic coefficient is observed. The temperature where the coefficient vanishes has been found to be almost independent on the concentration of the chiral molecules. A simple explanation is…