Materials Literature
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A novel technique is presented which allows the experimental determination of the emission cross-section spectrum of the pump transition of praseodymium in ZBLAN glass. The technique is based on measuring the population density of the upper level as a function of pump power as well as wavelength. The emission and abso…
The design, analysis and testing of composite-to-metal joints for the ARPA Man-Rated Demonstration Article are discussed. The first is a composite-to-titanium sphere joint designed to react sphere membrane stress with block compression loading. A series of uniaxial compression tests to simulate this joint assembly was…
ZrO2-MgO-Al2O3 powder composites were prepared by calcining gelled mixtures of Mg(OH)2, Zr-n-butoxide and Al-sec-butoxide (or Al2O3) at 1000°C for 2h. The calcined powder was cold isostatic pressed at 200MPa and sintered at 1500 to 1650°C for 1h. Fine and homogeneous tetragonal-ZrO2 grains were dispersed in the sinter…
Beta-Si3N4 powder made by the imide-decomposition method was gas-pressure sintered at 1800°C for 4h in 1MPa N2 gas. This material had a microstructure of “in-situ composite” and excellent mechanical properties (strength: 780MPa, fracture toughness: 7.5MPa·m1/2), whereas β-Si3N4 powder made by the silicon nitridation m…
Mullite/zirconia composite materials were characterized in terms of electrical conductivities, structure and microstructure. It was found that the conductivity assumes a minimum at about 10mass% ZrO2. The highest conductivity was observed in the range of 60-100mass% ZrO2. XRD studies have revealed that the tetragonal…
Scanning electron microscopy (SEM) was used to investigated the effects of volatile solvents (such as water, propanone, ethanol, methanol or ethyl ether), treatment and drying processes, microwave ovens, drying ovens, and vacuum desiccators or freeze driers, on silica morphology. Silica gel was obtained from diluted s…
Experimental results on the platelet adhesion, and CHO cell adhesion and growth onto nonionic surfactant which is composed of a long alkyl chain (n = 12-18) as the hydrophobic part, and a polyethyleneoxide (PEO) segment (n = 10-23) as the hydrophilic part coated and air-plasma treated PSf surfaces are presented in ter…
Microstructures and magnetic properties of the Nd-Fe-B magnets sintered by adding Dy compound powder are examined. The Nd15Fe77B8 powders are mixed with Dy40Al30Cu30 compound powders and then sintered, followed by an appropriate heat treatment. It is found by EPMA analysis that the R2Fe14B main phase is composed of a…
Gaseous oxygen impacts may occur in high-pressure oxygen systems whenever oxygen equipment is pressurized too fast. This is one of the main causes of fires in such systems. Therefore, equipment for high-pressure oxygen that contains nonmetallic sealing materials should be tested for burn-out safety. This is required b…
Короткие спиновые волны обменной природы в ферритовых слоях: возбуждение, распространение и перспективы применений, Зильберман П.Е., Темирязев А.Г., Тихомирова М.П.
For the purpose of high strength austempered ductile iron (ADI) has the potential to reduce the size and weight of automotive parts, however poor machinability has made it difficult to achieve broad commercial application.To clarify the mechanism of poor machinability of ADI, (i) the chips was analysed by X-ray diffra…
L’acide 1 -vanado-1l-molybdophosphorique et certains de ses sels alcalins sont très actifs dans la réaction de déshydrogènation oxydante (ODH) de l’acide isobutyrique (AIB) en acide méthacrylique (AMA). Cependant leur synthèse stéréospécifique et leur identification posent encore problème. Nous avons été amenés à mett…
Aluminium nitride (AIN) powders with 0-1.2 mass% of carbon and 5 mass% of Y2O3 addition were sintered at 2023 and 2073K under a nitrogen atmosphere, and the sintered samples were characterized by their oxygen content, composition of the secondary phase, microstructure, density, and thermal conductivity. With an increa…
Thermal conductivity of mullite-zirconia composites was measured. Since the thermal conductivity of zirconia is smaller than that of mullite, the conductivity of composites gradually decreased with the addition of zirconia up to 30vol% into mullite, which is consistent with the results estimated from the Eucken's equa…
ポリ塩化ビニル廃棄物の新しい処理方法として, 高温熱水中において脱塩素化を行う方法について検討した。その結果, 金属鉄あるいはアルカリの存在のもとに, 300℃の亜臨界高温熱水中では1時間程度の反応時間で, また250℃では20時間程度で, ほぼ100%の脱塩素化が可能であることがわかった。さらに, 金属鉄のみの存在下では主に置換反応による脱塩素化が進行し外見上高分子の分解反応の進行はほとんど認められず, 反応後には溶融固化した固体が得られること, および, アルカリのみの存在下では分解反応と脱塩素化反応が同時に進行し, 反応生成物のほとんどが水溶性あるいは非水溶性液体となり固体残さは極めて少ないことがわかった。また, 金属鉄とア…
Abstract A new exponential‐hyperbolic size‐dependent crystal growth rate function G (L) = G m ( e aL – b )/( e aL – c ) is proposed. The model has been examined in detail for the direct determination of size‐dependent crystal growth rates from the cumulative number oversize distribution of continuous Mixed‐Suspension…
X-Ray photoelectron spectra of bis[1,2,5]thiadiazole-p-quinobis(1,3-dithiole)(BTQBT) reveal that the sulfur and carbon atoms in the molecules show four- and two-peak profiles, respectively, and are in mixed-valence states. Substitution of the sulfur atoms linked to nitrogen atoms by selenium atoms removes the mixed va…
This paper describes the magnetostriction of an arbitrary direction under an alternating magnetic flux measured by a two-dimensional magnetic measurement method. The magnetostriction of an arbitrary direction was measured by three-axial strain gage and analyzed by the tensor method. In the case of non-oriented silicon…
The effects of the fiber volume fraction of CFRTP (Carbon Fiber Reinforced Thermoplastic polyimide) on creep behavior were investigated. The bending creep tests for resin and CFRTPs where fiber volume fractions were 3.7, 7.6 and 15.6% were carried out at constant temperatures from 190 to 240°C. For all materials, mast…
The applications of supported metal catalysts vary widely, from selective hydrogenation in the fine chemicals industry to the control of vehicle emissions. Yet many basic questions about the structure, activity, and durability of these catalysts remain unanswered. For example, there is still much uncertainty about the…