Materials Literature
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Results of X-ray diffraction measurements of metaphosphate glasses with modifier atoms Me = Zn, Mg, Sr, Cd, Pb, Li are presented where the contrast with neutron diffraction data and the high real-space resolution from using photons of more than 100 keV are exploited.
Isotactic polypropylene consisting of uniaxially oriented P-phase lamellae was crystallized in a temperature gradient. The β → α transition was investigated by simultaneous measurements with differential scanning calorimetry (DSC) and X-ray diffraction using synchrotron radiation (SR). To compare the transition mechan…
The aging behavior (microstructural evolution and mechanical properties change) of a 25%Cr-7%Ni-3%Mo duplex stainless steel at 873 K was investigated. A very short term (3.6 ks) aging treatment caused a significant decrease of impact toughness before the formation of σ phase. Quasi-stable R phase was observed to form…
This chapter provides a comprehensive discussion of principles, theories, and techniques of liquid-phase sintering. The process is used to produce a wide variety of ceramics and is particularly effective for ceramics with a high degree of covalent bonding that are normally difficult to densify by solid-state sintering…
Recently, ferroelectric random access memory has drawn a great deal of attention due to inherent properties such as nonvolatility, long retention time, high endurance, fast access time, small cell size compared to DRAM cell size in principle, and strong resistance to /spl alpha/-particle and cosmic ray irradiation. No…
Digital feedback technique has advantages of good reproducibility of waveform due to no human error and of no oscillation in control process compared with analog technique. However, it may require many iterations of feedback, especially at higher flux densities, because a considerably distorted voltage waveform should…
Thermally stimulated polarisation (TSPC) and depolarisation current (TSDC) techniques were used to study polarisation and conduction in xFe 2 O 3 (100-x) P 2 O 5 , (14≤x≤47) glasses. TSDC peaks located between 196 and 262 K were attributed to polarisation caused by intrinsic dipolar defects. Electronic conductivity wa…
3Y-TZP/20 mass% La {Co0.5Fe0.5(Fe0.9Al0.1)11}O19 composites were successfully synthesized in situ during sintering from a mixture of 3mol% Y2O3-ZrO2, La(Fe0.9Al0.1)O3, Fe2O3, Al2O3 and CoO powders. Platelike La{Co0.5Fe0.5(Fe0.9Al0.1)11}O19 crystals were grown stably in a 3Y-TZP matrix over a temperature range of 1200…
A new method of pinpointing dielectric fluid leaks on pipe-type and self-contained power cables using perfluorocarbon tracer (PFT) is presented. The method has successfully been used on the Con Edison transmission system to locate leaks of dielectric fluid on both types of cables. Application of the PFT technique does…
A hysteresis curve of AC magnetostriction was measured, magnetizing a grain oriented silicon steel in the direction deviated from rolling direction of the sample. The AC magnetostriction curves were analyzed as harmonics in the interest of noise spectrum of such as a power transformer. The domain structure model in th…
A tridimensional finite element model of isothermal pseudoelastic deformations is proposed in order to analyze and predict the behavior of shape memory alloys (SMA). To perform finite strain calculations, the mechanical modeling is based on a formulation in a non material rotating frame. The constitutive equations in…
BaAl 2 O 4 /aluminum‐bearing composites have been synthesized via the low‐temperature oxidation of Ba‐Al precursors. Ba‐Al powder mixtures that were prepared via high‐energy vibratory milling were uniaxially pressed into bar‐shaped specimens that were then exposed to a series of heat treatments in pure, flowing oxygen…
A carbon conductive film consisting of nanometer sized domains has been patterned by scanning photoablation of polystyrene. The film formation involves the photoablation of a highly insulating polymer, and the redeposition of conductive carbon fragments. This film has been investigated by scanning electron microscopy,…
Two types of crystalline approximants of the decagonal phase have been found in the Al-Cu-Cr system by electron microscopy, in specimens annealed at 1050°C. The structures are orthorhombic with lattice parameters of a = 1.48 nm, b = 1.26 nm, c = 1.27 nm, and base-centered orthorhombic with lattice parameters of a = 2.…
Molecular mechanics methods have been used in order to find the conformations of various syndiotactic polymers in crystals. Three different classes of polymers have been examined: i) polyolefins, such as poly(propylene), polystyrene, poly(1-butene) and poly(1,2-butadiene); ii) polydienes, such as cis-1,4-poly(1,3-pent…
Ara-adenosine (adenine 9-β-D-arabinofuranoside) and ara-guanosine (guanine 9-β-D-arabinofuranoside) are converted into 2′ halogenated ATP and GTP analogues by triflation and subsequent inversion of configuration at C-2′. For the commercially unavailable ara-guanosine a short synthesis starting from guanosine is presen…
The self-catalytic role of zirconium n-propoxide (ZP) has been investigated with respect to the synthetic parameters of ZrO 2 –SiO 2 binary gels. It is found that gelation time can be shortened with a high concentration of tetraethoxysilane (TEOS) in the presence of a small amount of ZP. There are two different gelati…
Many product thermal/physical properties used as model inputs are highly variable and some have not beenindependently determined. The chosen values of these properties can affect the accuracy of weight loss predictions.Peaches were selected as the product to study and three parameters, skin mass transfer coefficient (…
A formation of a mushy region (two-phase zone) for binary melt solidification is theoretically studied on the basis of numerical calculations. The velocity of solidification is determined in the form of a linear function of time for one-dimensional unidirectional solidification regime from a solid wall which is cooled…
The corrosion performance of various stainless steels, nickel alloys, and refractory metals has been evaluated in hot (up to 95°C) methane sulphonic acid. Studies included weight loss coupon exposure tests and potentiodynamic polarisation measurements. Also, the corrosion inhibiting effect of some inorganic inhibitors…