Materials Literature
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2成分系カルシウムフェライトと4成分系カルシウムフェライトの還元挙動の違いを明らかにするための基礎的研究として,試薬を用い化学組成の異なる2種類のCaO-Fe2O3-Al2O33成分系カルシウムフェライトを合成し,そのCO-CO2混合ガスによる還元経路並びに還元平衡を調べ以下の結果を得た。(1)Al2O3含有量の多いCaO・3(FexAl1-x)2O3系の3成分系カルシウムフェライトはCaO・Al2O3を析出しながらAl2O3,CaOを固溶したマグネタイト,ウスタイトを経て鉄に還元され,4成分系カルシウムフェライトと還元経路は同じである。還元の各段階の平衡曲線は,純粋なマグネタイトとウスタイトおよび純粋なウスタイトと鉄の平衡曲線を…
Description Comprehensive look at the latest research on how radiation effects metal and non-metal materials, with emphasis on fundamental mechanisms of damage and applications to nuclear systems. Over 80 peer-review papers in 15 sections. The diversity of the selections cover a complete range of topics, including: •…
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Three electrode materials, nickel, palladium and platinum were tested about the ohmic contact to semiconducting BaTiO3 ceramics for the application in multilayer BaTiO3 semiconductors with a positive temperature coefficient (PTC) of resistivity. Semiconducting BaTiO3 ceramics with nickel electrodes showed a good ohmic…
By definition, magnetoelectric domains exhibit different tensor components of the magnetoelectric tensor when observed from the same coordinate system. Since direct detection of the magnetoelectric tensor components is difficult, it is advantageous to know in which other material tensor properties the magnetoelectric…
Abstract The third‐law method is used to assess the authenticity of available equilibrium constants for the thermal dissociation of N 2 O 5 ⇌ NO 2 + NO 3 . © 1994 John Wiley & Sons, Inc.
A cold crucible is useful for contactless melting of metals. Metals and alloys can be refined to high degrees of purity with cold crucibles. The construction of a crucible strongly influences the melting conditions of molten metal. In this paper, crucible construction is examined in experimental investigations and ele…
Pitting Corrosion behaviour of commercial stainless steels (SS) types 904L and 316L has been investigated in pure sodium chloride solutions of different pH values and at different temperatures.Potentiodynamic polarization technique and scanning electron microscopy were utilized. The results indicated that pitting corr…
Single crystals of the metastable phase of KCOPO4 (α-KCP) have been synthesized in a gel of tetra-methoxysilane. The crystals have a hexagonal symmetry which belongs to space group P63 (cell parameters a = 18.206(1), c = 8.5135(8) [Å] and Z = 24). The crystals have been characterized by x-ray diffraction and by polari…
A two‐stage lights‐gas gun has been used to impact thin zinc bumpers by zinc projectiles over the velocity range of 2.4 km/s to 6.7 km/s to determine the propagation characteristics of the impact generated debris. Constant‐mass projectiles in the form of spheres, discs, cylinders, and rods were used in these studies.…
Hugoniot elastic limit and indentation hardness data are provided for selected high‐strength ceramics. The degree of correlation of the strength data by the two test methods is examined. The influence of deformation mechanism on the strength measurement, including rate sensitivity, size scale and confining pressure, i…
Hydrogen permeation characteristics of Pd-coated membranes of V-Mo alloys (10-50 at.% Mo) have been investigated using the gas permeation technique in the temperature range 423-673K. Hydrogen solubilities of the alloys have been determined using a volumetric method in the temperature range 473-673K. The Pd-coated memb…
KEYWORDS: catalysissilver-impregnated silica gelmethyl iodideiodineadsorbentsadsorptionnitrogen dioxidefuel reprocessing
Carbonatites are igneous rocks formed in the crust by fractional crystallization of carbonate-rich parental melts that are mostly mantle derived. They dominantly consist of carbonate minerals such as calcite, dolomite, and ankerite, as well as minor ...Read More
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Abstract A series of synthetic garnets solid solutions is compositions between Y 3 Al 2 Al 3 O 12 (Y‐Al garnet) (YAG) and Ca 3 Cr 2 Si 3 O 12 (uvarovite) was synthesized using the sol‐gel method. The expected general formula is (Ca x Y 1‐ x ) 3 (Cr x Al 1‐ x ) 2 (Si x Al 1‐ x ) 3 O 12 where x = 0 to x = 1. The cation…
Using a false twister for hollow spindle wrap yam spinning is supposed to facilitate operations. However, our investigation shows that a high level of false twist can sig nificantly influence yarn appearance and mechanical properties. Wrap yarn spun with a false twister has a tortuous structure, while wrap yarn spun w…
Abstract Synthesis and properties of urethane elastomer‐modified epoxy resins were studied. The urethane elastomer‐modified epoxy resins were synthesized by the reaction of a 4‐cresol type epoxy compound having hydroxymethyl groups (EPCDA) with isocyanate prepolymer. The structure was identified by IR, 1 H NMR and GPC…
X-Ray diffraction studies have been made of the crystalline luminescent material Na+–Er3 +β″-alumina for three different erbium ion concentrations; equivalent to 100, 72 and 26% substitution of Na+ ions (Na1+y–3xErxMgyAl11–yO17, for x= 0.56, 0.40 and 0.14, respectively, and y= 2/3). The results form thereafter a struc…
The variation of magnetic and loss characteristics of nonoriented silicon-iron sheets with frequency and temperature under sinusoidal magnetic flux-density conditions have been investigated using an Epstein frame. The investigations have made it possible to model the variation of iron loss with frequency and magnetic…