Materials Literature
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The domain structure which takes place in the phases surrounding a reconstructive phase transition is discussed. Three different examples belonging to distinct classes of reconstructive transitions are considered: 1) Transitions between crystal structures, 2) Crystal-Quasicrystals, 3) The lamellar-cubic transition in…
The anodization of Si «100» and «111» wafers in dilute HF solutions has been investigated, with particular reference to probing the surface chemistry and features between the porous and electropolishing regions (the ‘boundary transition’ region). Conditions have been found for inducing the formation of ordered arrays…
Peel strengths of five pressure-sensitive styrene-butadiene emulsion polymers, having different amounts of gel and different glass transition temperatures, have been determined as a function of temperature and peel rate. For each peel rate, the peel strength reaches a maximum at a particular temperature, and this maxi…
We present an optimal approach for designing polarizing beam splitters made of a sheet of birefringent material. The polarizing beam splitter is in the form of a transmission diffraction grating with a surface-relief structure of periodic sawtooth shape. We describe the necessary conditions for optimal design and deri…
In on-line isotope separation, rapid efficient release of short-lived radioactive products from thick targets has traditionally been accomplished by the use of refractory target materials heated to elevated temperatures. At high temperatures, (∼2000 °C) the diffusion rate of the desired product from the target matrix…
We report here effects of microdomain structures on the mechanical properties of polystyrene-block-polyethylenebutylene-block-polystyrene (SEBS) triblock copolymers. Microdomain structures were analyzed by the small-angle X-ray scattering technique and the mechanical properties were evaluated by the viscoelastic measu…
Block copolymers of poly(ethersulphone) (PES) oligomers with liquid crystalline polyester units were synthesized by the reaction of dihydroxy-terminated poly(ether sulphone) oligomers (number-average molecular weights: 704, 1,158 and 2570) and terephthaloyl bis(4-oxybenzoyl chloride), and their properties were investi…
The R D of hydrogen absorbing alloys in Japan started in the early 1970s.Many alloys such as TiMm1.5 based alloys, Fe-Ti-O alloys (e.g. FeTi1.15 O0.024) andthe(mischmetal)Ni5 based alloys (e.g. MmNi4.5 Cr0.46 Mn0.04) were developed by the early 1980s. The application of these alloys to hydrogen storage, heat storage,…
The corrosion behavior of Ti-(0-40)mass%Mo alloys prepared through P/M technology was studied by corrosion test and electrochemical measurements. The corrosion rate of sintered Ti-Mo alloys in 35% HCl solution decreased remarkably with increasing molybdenum content. The corrosion rate of Ti-40mass%Mo alloy, for exampl…
Abstract The crystal structure of poly(aryl ether biphenyl ether ketone ketone) (PEDEKK) was determined to comprise a two‐chain orthorhombic unit cell with dimensions a = 0.778 nm, b = 0.606 nm and c = 2.375 nm by using wide‐angle X‐ray diffraction (WAXD). According to the orthorhombic system, the 12 reflections of th…
A new hot-forming process has been studied to produce anisotropic Nd-Fe-B-based magnets from melt-spun ribbons. The ribbon fragments were inserted in a Cu tube and hot-deformed together with one-stroke. At a height reduction ratio of 0.44, the melt-spun ribbons were densified into a magnet with a density of 7.14 g/cm/…
The study, using bacterial collagenase, was to investigate the changes in characteristics of a collagen-rich tissue, porcine pericardium, fixed by glutaraldehyde or epoxy compound (ethylene glycol diglycidyl ether) during the course of degradation. Fresh porcine pericardium was used as a control. During degradation, t…
Orthorhombic Li2MgSiO4 in which all the cations lie in tetrahedral sites can incorporate large amount of Cr4+ ions.Cr4+:Li2MgSiO4 exhibits broad-band fluorescence around 1.2 μm, with fluorescence lifetime exceeding 100 μs at room temperature. This is the longest lifetime reported so far for a tetrahedral Cr4+ doped co…
The wear mechanisms of a 3% mol yttria stabilized tetragonal zirconia ceramics (TZP)/52100 steel reciprocating sliding couple under water lubrication were investigated in this paper. The wide ranges of normal loads and sliding speeds were chosen in order to study the relationship between the tribological performance o…
Two tetra(alkylsilsesquisulfides) (R4Si4S6, R=t-Bu, 1,1,2-trimethylpropyl) were synthesized. The structures were determined by X-ray crystallography and novel “double decker”-type structure was revealed for tetrakis((1,1,2-trimethylpropyl)-silsesquisulfide).
In order to effectively utilize the fish and squid skin wastes derived from marine processing manufacture, the skin wastes of some pelagic fishes such as yellowfin sole, red cod, cod, Allaska pollack and flying squid were screened for the raw material of edible gelatin and studied some properties of those gelatins. Th…
Effect of interfacial roughness between YSZ (ZrO 2 •8molY 2 O 3 ) electrolyte membrane and Ni-YSZ cermet anode layer, and LSM (La 0.85 Sr 0.15 MnO 3 ) cathode layer on the electrochemical reaction was investigated by sintering the above mentioned electrode layers on each side of the roughened surfaces of the electroly…
Minimal spanning tree has been applied to the analysis for spatial point distribution pattern of microstructures. The technical remarks on the analysis have been examined by using generated model patterns of square lattice, triangle lattice square inhibition and triangle inhibition models. The number of sample points…
The hot corrosion resistance of twelve Ni-base alloys was evaluated at 873 K by three different laboratory tests; immersion test, salt coating test and embedding test. In these tests, three different corrosion ashes were employed, a sulfate (Na2SO4-K2SO4-ZnSO4), a chloride (NaCl-KCl-LiCl-CaCl2) and a chloride/sulfate…
SummaryMagnesium hydroxide is shown to dehydrate endothermically to magnesium oxide over a similar temperature range to that of the thermal degradation of polyamide. The extent of dehydration in plasma spraying is shown to be a function of particle size. However the research indicates that the use of magnesium hydroxi…