Materials Literature
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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…
We have developed a modified version of the ballistometer to assess the elastic properties of the skin in vivo through the measurement of the rebound of a hard object on the skin surface. Information about the skin's elasticity was obtained by analyzing the rebound patterns resulting from the interaction betw…
In the three solid phases I, II and III of methylammonium bromide obtainable above room temperature, the highest-temperature phase I (483–510 K), which is an ionic plastic phase, and also the high-temperature range (ca. 457–483 K) of phase II, are shown to transform spontaneously into liquid when maintained at any tem…
During silylation of porous glass with 3-aminopropyltriethoxysilane, the properties of the carrier affected the concentration of bound amino groups, the formation of aminopolysiloxane mono- or multilayer on the surface, and the hydrolytic stability of the layer formed. The influence of the carrier depended on the spec…
従来の電気めっき法,溶融めっき法に代わる新しいめっき法として,EB加熱方式による真空蒸着法を応用した連続蒸着試験設備により,5種類の蒸着Zn合金めっき鋼板を作製した.その結果,以下のことが明らかとなった.1)電子ビーム加熱により,近接された二つのるつぼから,Znと合金元素を同時蒸発させることによって,連続的に鋼板表面に蒸着Zn合金めっき層を形成することが可能である.合金めっきのめっき付着量及びめっき組成の制御は,電子ビームの出力,照射時間配分及びラインスピードを調整することによって可能である.2)めっき層の表面結晶状態は,合金元素の種類によって異なり,六方晶の結晶が基板に対して平行に配向するものと,斜めに配向するものとに大別された…
Abstract Atmospheric corrosion of copper can result in substantial problems for electrical interconnection in microelectronic applications. We have used x‐ray photoelectron spectroscopy (XPS) to examine the effects of benzotriazole (BTA), an organic corrosion inhibitor, on atmospheric oxidation and sulfidation of poly…
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