Materials Literature
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The magnetic properties of 0.15-3%Si non-oriented electrical steel sheets were measured at temperatures ranging from 4 K to 200°C. Except for the 3%Si sheet, all the sheets were more easily magnetized at higher temperatures. The hysteresis losses increased at lower temperatures, but the changes were less than those du…
To understand the role played by the complex microstructural arrangements in a giant magnetostrictive material, we were led to develop a micromagnetic theory where equilibria are described by the oscillatory statistics of approximating or minimizing sequences of a variational principle. The issues we encountered and t…
Graphite films with very high crystal perfection were prepared from carbonized aromatic polyimide films by successive heat treatments at 3100°C for 40 min and then 3200°C for 23 min without mechanical stress. The starting materials were a commercially available Kapton with 25 μm in thickness and laboratory prepared hi…
Substituted dihydroxystilbenes 2 are suitable starting materials for the synthesis of photochromic systems derived from 3/4. Attempts to couple the naphthones 8a-8e by the McMurry reaction with TiCl3/LiAlH4 yielded mainly reduction products such as 8f, g or 9. However, the furofuran 3b was isolated when using the zinc…
Friction and wear properties of C/C and ceramic particle dispersed C/C composites sliding against sialon ceramics were investigated in a zinc plating bath.The results are summarized as follows:(1) SiC particle dispersed C/C has the highest friction coefficient and the lowest wear resistance. BN particle dispersed C/C…
Plasma arc technology is a high temperature process that completely oxidizes organic waste fractions: inorganic hazardous and radionuculide waste fractions are oxidized and encapsulated in a highly durable slag. The robust nature of the technology lends itself to application of diverse mixed and hazardous wastestreams…
Abstract Thermal decomposition of freeze‐dried complex oxalate precursors allows the synthesis of crystalline phases in the FeNbO 4 TiO 2 system at relatively low temperature. This system shows not only a rutiletype, but also a wolframite‐type solid solution (ss), which exists at lower temperatures. The temperature o…
A study is made of the thermal expansion coefficient and the glass transition temperature in atactic polymethylmethacrylate (PMMA) irradiated first with γ-ray doses between 50 and 200 kGy, The change of the molecular weight due to the damage of the polymer chain produced by the γ-irradiation was also measured. Besides…
The modified null field approach to elastic P- and SV-wave scattering (in plane strain) from a partially debonded fiber has been developed. The debonded region on the fiber surface is subjected to traction free boundary conditions, whereas the fiber is assumed to be in welded contact with the host medium elsewhere. Ad…
Diffusion coefficients of hydrogen and deuterium in titanium, titanium–aluminium alloy Ti88Al12 and intermetallic Ti3Al have been measured in the temperature range 873–1298 K. The activation energy for diffusion has been found to be almost the same for hydrogen and deuterium and to increase, as the aluminium content i…
Abstract Polypropylene (PP) particles were chemically coated with polypyrrole (PPy). The content of polypyrrole varied from 0.8 to 7.6 wt.‐%. Electrical conductivity of compression moulded samples depends on the concentration of polypyrrole and reached values from 4×10 −10 to 5×10 −3 S/cm, which is about 7 orders of m…
The results are presented of a study of pretreatment methods as possible controls on the buildup (plateout) of cobalt and cesium activity on the inside surfaces of mild and stainless steel piping used to carry radioactive liquors. Coupon specimens of mild steel and Type 304L and 18/13/1 stainless steel piping are trea…
Surface engineering is a multidiscipline activity aimed at tailoring the properties or surfaces of engineering materials to improve their function or service life. As applied to metals, surface engineering includes processes such as plating, diffusion treatment, physical and chemical vapor deposition, ion implantation…
The requirements for cleanliness in bearing steels are so high that special methods have to be used in order to characterize their inclusion content.
Abstract Spontaneous and by an external magnetic field induced magnetic phase transitions in TbFeO 3 have been experimentally studied. Precision investigations of velocities of transmission and attenuation of sound wave were made, the processes of formation and rearrangement of magnetic structure examined and its chan…
A new single crystal N&Fe based superalloy, designated THYMO-NEL 8, was developed in order to satisfy the specific requirements of rocket engine turbopump airfoils. The principal objective was to obtain an alloy with a high fatigue resistance together with a low susceptibility to hydrogen environment enbrittlement (HE…
Two types of aromatic polyurethanes, poly(hexamethylene phenyl dicarbamate) (PUH6) and poly(heptamethylene biphenylene dicarbamate) (PUB7) have been synthesized by the polycondensation method. Structural, pyroelectric and dielectric properties of these polyurethanes were studied. The pyroelectric activity was studied…
In the past, we reported on the two-dimensional magnetic properties of the three-phase transformer model core with silicon iron. They are measured by using the two-dimensional magnetic sensor. In this paper, the silicon iron core results are compared with those of an amorphous power core. As the results, the differenc…
Three different methods are used for the quantitative local texture analysis of fibre textures. Two methods are based upon the evaluation of BRAC‐BRENTANO diffraction diagrams. In the first method relative intensity parameters are calculated, whereas in the second Rietveld preferred orientation factors are determined.…
A study to characterize the structure of air-jet textured yarn in terms of its migration parameters has been carried out by using the tracer fibre technique. An attempt has been made to establish the relationship between the migration parameters and the properties of air-jet textured yarns using polyester (dry and wet…