Materials Literature
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A number of reviews have been published detailing the chemical and physical properties of silkworm silks 1–6 and the genetics of silk production in the silkworm 7–9 . Here we overview some of the key chemical and physical properties of both silkworm and spider silks, and then review the genetic aspects of silk product…
Development of highly conductive materials with high strength is requisite for conductors of high field magnets. To develop such materials, the Cu-Ag alloys (2-60 at%Ag) and their fabrication methods have been investigated. This paper describes the mechanical and electrical properties as well as the microstructure of…
INCONEL@ alloy 625 is a nickel-chromium-molybdenum alloy that is used for its high strength, excellent fabricability and weldability, and outstanding corrosion resistance. The outstanding and versatile corrosion resistance of INCONEL alloy 625 under a wide range of temperatures and corrosive environments is the primar…
Nonlinearity in the internal self-impedance of railroad rail can give rise to power frequency harmonics in traction systems. Limiting case analytical models of rail impedance, based on linear complex permeability and complete saturation, are compared with measurements for currents to 800 A and frequencies to 10 kHz. T…
Chloroform solutions of medical grade silicone resin were cured in an aqueous dispersion medium containing poly(vinyl alcohol) (PVA) as the drop stabilizer at 40-60 degrees C to generate smooth, spherical, elastic microspheres. The microspheres were encapsulated with tantalum powder to render them radiopaque. Tantalum…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemistry of metal oxo alkyl complexes. Mechanistic studies on the anaerobic and aerobic decompositions of molybdenum(VI) dioxo dialkyl complexesWilliam M. Vetter and Ayusman SenCite this: Organometallics 1991, 10, 1, 244–250Publication Date (Print):January 1, 1991Publicatio…
The absorption and emission spectral properties of a series of meso-substituted octaethylporphines and their zinc complexes have been investigated. Changes in electronic absorption spectra induced by the substituents can be explained by Gouterman's ‘four-orbital’ model. In order to account fully for the effect of the…
The six-co-ordinate iron(III) complexes [Fe(bzpa)2]ClO4(Hbzpa =(1-benzoylpropen-2-yl)(2-pyridyl-methyl)amine] and [Fe(acen)(NC5H3Me2-3,4)2] BPh4[H2acen = ethylenebis(acetylacetoneiminate)] have been shown by variable-temperature magnetic and Mössbauer spectroscopy measurements to be spin-crossover (S=5//2; ⇌S=½) compl…
Abstract We review Charpy impact testing at extreme cryogenic temperatures, especially at liquid helium temperature (4 K), considering methods of testing and calibration, thermal behavior during the various stages of testing, and correlations between Charpy absorbed energy and quantitative toughness parameters. Becaus…
The corrosion behavior and mechanism of matrix resins for FRP in aqueous solutions were investigated, comparing these with the corrosion of metals. Three forms of corrosion were found, namely surface reaction type, corrosion layer forming type and penetration type. In surface reaction type corrosion, which was recogni…
A modified Friedel–Crafts synthesis has been used to make a variety of aromatic ether–ketone–‘X’(EKX) polymers. The ‘X’ groups incorporated were: imide, amide, sulphone, ester, azo, quinoxaline, aliphatic, fluoroaliphatic and fluoroaromatic. Some properties of these EKX polymers are reported and discussed.
A theory is presented for supersolidus liquid phase sintering. It is assumed that densification is by a viscous flow process involving the formation of liquid films along the interfaces in polycrystalline, prealloyed particles. The rigidity of the particle is determined by the percolation threshold where structural in…
The effect of thermo-mechanical treatment on the shape memory characteristics in a Ti-40Ni-10Cu (at%) alloy has been investigated by means of electrical resistivity measurement, differential scanning calorimetry, X-ray diffraction and the thermal cycling test under constant load. The following results are obtained. (1…
Hot deformation of 7075 aluminum alloy was studied in compression in the temperature range of 723 to 803 K and at constant true strain rates from 5.4×10−6 to 0.8 s−1. The flow characteristics were classified into three types and analyzed in each region of testing conditions, as follows; L, M, and H. In region H where…
The PALLAS (discrete ordinates-integral transport) code was improved to include secondary sources, such as bremsstrahlung and fluorescence, to assure accurate and reliable results. The point buildup factors for high-Z materials were calculated with this code in the energy range of 0.015~15 MeV up to 40 mean free paths…
The solidification structures and segregation of the VAR cast ingots of alpha+beta titanium alloys were investigated by using a new etching technique and CMA analysis.Main results were summarized as follows:(1) The fine structures of the solidification were revealed by immersing the specimens in an advanced hydrofluor…
The thermal decomposition and the phase transformations of ammonium aluminum carbonate hydroxide (AACH) to α-alumina have been studied. Amorphous-, γ- and θ-alumina were identified as intermediate products. A TTT diagram for the process of the thermal decomposition and the phase transformations was determined. Kinetic…
Subsolidus phase equilibria in Al2O3-Y2O3-SiO2 system and the phase separation and crystallization behavior of glass in this system were studied by X-ray diffraction, differential thermal analysis, scanning electron microscopy and X-ray microanalysis. Phase relations, liquidus and solidus temperatures in this system w…
Electrochemical reduction of dimethyldichlorosilane without solvent but in the presence of a small amount of complexing agent in an undivided cell fitted with a sacrificial aluminium anode and a stainless steel cathode, under constant current, was found to produce polydimethylsilane in very high faradaic yields.
The in-reactor oxidation of zirconium alloys, the structural material in almost all water-cooled and water-moderated reactors, can be life-limiting. In September 1989 the International Atomic Energy Agency (IAEA), in cooperation with the U.S. Department of Energy (DOE), arranged a workshop on zirconium-alloy corrosion…