Materials Literature
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This paper presents a selection of the eutectic systems in the Al2O3–Y2O3–ZrO2 pseudo-ternary system and the production of the undercooled melt due to melting of the metastable eutectic structure at the metastable eutectic temperature. In the pseudo-ternary system, there are two eutectic systems; one is the Al2O3–YAG(…
A new apparatus based on the technique of Fourier transform thermal analysis for the measurement of thermal diffusivity, specific heat per unit volume, thermal effusivity, and thermal conductivity of thin solid and liquids films (of the order of micrometres) has been developed. The apparatus consists of the following…
The decomposition of ozone on a Cu(l10) surface has been studied using AM1 method. O3 probably adsorbs on Cu(l10) to decompose into a molecular oxygen and an adsorbed atomic oxygen species, an adsorbed atomic oxygen reacts with O3 to form an O4 -intermediate, and O4 - decomposes into two oxygen molecules. Intermediate…
An automatic wicking test method using image analysis technique was developed in order to automate the longitudinal wicking test and improve the accuracy of wicking measurement. It was particularly useful for conducting wicking measurement during the initial rapid wicking process. The comparison between the manual and…
Japan Atomic Energy Research Institute (JAERI) has been developing design studies of the Gas Turbine High Temperature Reactor (GTHTR300) based on the experiences of development of the High Temperature Engineering Test Reactor (HTTR) of JAERI. Feasibility of the GTHTR300 fuel which is irradiated under high burnup condi…
The REVE (REactor for Virtual Experiments) project is an international joint effort aimed at developing multiscale modelling computational toolboxes capable of simulating the behaviour of materials under irradiation at different time and length scales. Well grounded numerical techniques such as molecular dynamics (MD)…
The inherent structure approach, wherein thermodynamic and structural changes in glass-forming liquids are analyzed in terms of local potential energy minima that the liquid samples, has recently been applied extensively to the study of thermodynamic aspects of glass-forming liquids. The evaluation of the configuratio…
In the past we fabricated and put to practical use novel noise suppressor sheets made of micro-forged Fe-Si-Al flakes and polymer. These composite sheets exhibit a peculiar dual dispersion in the frequency characteristics of the imaginary part of the permeability. For use as a noise countermeasure, a steeply rising pr…
Silver nanostructured thin films stabilized by 2,2′-dithiodipyridine (2dtpy) were prepared. The Ag nanoparticles were obtained by treating the complex [Ag(2dtpy)]NO3 with NaBH4 in a methanol–toluene mixture. The films were transferred to borosilicate glass slips by a dip-coating method and were found to consist of Ag…
The crystal chemical features and occurrence of the new orthoamphiboles (space group Pnmn), protoferro-anthophyllite and protomangano-ferro-anthophyllite, are described. Protoferro-anthophyllites (PFA) are found in fayalite masses from granitic pegmatites at Cheyenne Canyon and Cheyenne Mountain, Colorado, U.S.A. and…
Properties of needlepunched nonwoven fabrics that are used for automotive applications have been investigated by blending thermoplastic fibers under various needling parameters. Higher tensile and bursting strength were achieved by introducing lower modulus nylon 6,6 fibers into the PET substrate. Increased bursting s…
Espumas sintáticas são materiais cujas células são formadas por esferas ocas, de vidro ou poliméricas, com diâmetros na faixa de 10 a 100 µm. A utilização de Glass BubblesTM para a obtenção de espumas sintáticas de polipropileno é uma opção para obter material de baixa densidade sem grande perda de propriedades mecâni…
An alternative method for the hardening of steel parts has been developed as a means of providing steel products with superior mechanical properties through development of high residual compressive stresses on the part surface, and involves the application of intensive quenching during heat treatment. This processing…
Dielectric measurements on four samples composed of bent-shaped molecules with the same basic structure were carried out. They differ only in the position of one fluorine atom in the central core. Two relaxation ranges were detected: the fast reorientation about the long axes and a slow collective process. In three ca…
Titanium aluminides [L10-TiAl (Ti0.50Al0.50 and Ti0.40Al0.60), TiAl2 and D022-TiAl3] have been mechanically ground (MG) in an argon atmosphere. In addition, hydrogen absorption and desorption properties of the MG-alloys have been investigated. Hcp- and amorphous (a-) TiAl, fcc- and a-TiAl2 and fcc-TiAl3 are formed by…
The thermal expansion behaviors of the porous and dense spinel bodies, and the cathode with the spinel in high temperature solid oxide fuel cells have been investigated during a thermal cycle measurement in an atmosphere. The porous body with relative density of 81% showed a large expansion at temperatures between 101…
Nanosecond time‐resolved Raman spectroscopy has been performed to study polymer films, polytetrafluoroethylene (PTFE), under laser driven shock compression at laser power density of 4.0 GW/cm2. The CF2 stretching mode line of PTFE showed a higher shift (18 cm−1) at delay time of 9.3 ns due to the shock compression and…
The nanometer particles of TiO2 and TiO2/SiO2 oxides were prepared by sol-gel and supercritical fluid drying method.The properties of TiO2 and TiO2/SiO2 were characterized by means of BET(Brunner-Emmett-Teller method), TEM(transmission electron microscopy), SEM(Scanning electron microscopy), XRD(X-ray differaction) an…
Phase transformation behavior, the shape memory characteristics and the superelasticity of Ti–Ni–Cu–Mo alloys have been investigated by means of electrical resistivity measurements, X-ray diffraction, thermal cycling tests under constant load and tensile tests. A fully annealed Ti–44.7Ni–5Cu–0.3Mo alloy transformed in…
Rapid-solidification method was applied to make the Fe-15 at%Ga ribbon whose thickness was about 100 μm with improvement of ductility. The Fe-15 at%Ga ribbon sample showed a very large magnetostriction of εmax=−400×10−6 in comparison with εmax=−40×10−6 for the conventionally melt-worked bulk material at applied magnet…