Materials Literature
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In the past ten to fifteen years, considerable research has been conducted on the use of both organic and inorganic fibrous catalyst supports. Much work has been done recently on the immobilization of enzymes by porous solid fibers and by hollow fibers. Fibrous supports have the advantage over conventional supports su…
Over 120 organic compounds have been investigated as potential corrosion inhibitors for mild steel in simulated engine coolants. A relationship has been found between the corrosion potential (Ecorr) and inhibitor performance (Rp). With straight chain alkyl carboxylates, maximum inhibition was found for C6- C10 monocar…
It is pointed out that the magnetic material for cores of a differential current transformer (DCT) of a ground fault interrupter (GFI) should be characterized by high initial permeability, little dependence on temperature, and a low remanence. These parameters have been taken into consideration during selection of the…
A low temperature dyeing technique that was developed as a characterization method for poly(ethylene terephthalate) (PET) partially oriented yarns revealed thermally activated interactions between the fibers and spin finishes containing pure or close derivatives of poly(ethylene glycol) (PEG) that bring about dye bloc…
Abstract Extender oil bloomed on the surface of ethylene–propylene–diene rubber (EPDM) vulcanizates has been analyzed by a dissolution/size exclusion chromatographic (SEC) method. Dissolution is here defined as the quantitative and selective removal of bloomed extender oil from the vulcanizates. The rate of migration…
This paper summarizes the results of an investigation conducted to characterize tensile and shear response of P100/6061 graphite-aluminum composite in the temperature range -101 to 260°C (-150 to 500°F). The off-axis tension test and losipescu shear test methods were employed to meet this objective. The experimental r…
There is still some debate on the extent of plasticity of oxide scales at high temperatures. Examination of scales after creep of the substrate often shows that at higher strain rates scale cracks are visible after only very low strains (brittle behaviour), whereas at low strain rates no scale cracks are observed afte…
The effect of strain, strain rate and temperature on phase size and its subsequent growth during superplastic deformation has been studied for Ni modified Ti–6Al–4V. Experimental results suggest that these parameters strongly influence the effective dynamic phase size change for both phases and particularly for the be…
SummaryThe role of the hopeite and phosphophyllite phosphate coating ratios in determining the corrosion resistance of mild steel when coated with cathodic electroprimer and paint are reviewed and discussed. Attention is drawn to the problems associated with adequately defining the ratio, its calculation and broader r…
The compositional effect on magnetic properties of Co–Fe–Si–B amorphous alloys was examined with the aim of finding an optimum composition for a magnetic head material. The lowest coercivity (Hc) and the highest permeability at 0.3 kHz (μ0.3) in the as-quenched state were obtained at 0.94Co/(Co+Fe) and in the metalloi…
Electron microscopic studies of as-cast Sm(Co,Fe,Cu,Zr)/sub 9/ magnets revealed a hexagonal phase of the type Sm/sub 2/(Co,Fe,Cu,Zr)/sub 17/ with crystal lattice parameters of a=0.84 nm and c=3.2 nm. After a solid solution treatment, only rhombohedral (3R) and hexagonal (2H) grains were found. After an additional anne…
Joint of alumina ceramics (98.1% Al2O3) to copper was made using Cu-(10-50wt%)Ti-(5wt%)Co brazing filler metals. The Cu-30wt%Ti-5wt%Co brazing achieved the highest shear strength 195 MPa at room temperature.The composition and structure of the ceramic-metal bond zone in the Al2O3-Cu joints were analyzed by SEM, EPMA a…
The effect of profile imperfections, like axial index dip and layered structure in the inner cladding, on the leakage loss of LP01 mode in MCVD made single-mode DIC fibres is investigated quantitatively through a Matrix approach. The study reveals that these apparent profile imperfections may greatly affect leakage lo…
A study is reported of the effect on the mechanical properties of cotton fibres treated with liquid ammonia before application of dimethyloldihydroxyethyleneurea (DMDHEU). The properties are compared with those of the same cotton mercerized and then treated with DMDHEU. It appears from density determinations that the…
Abstract This article discusses the compositions, properties, and typical applications for ductile irons that are defined by U.S. and international standards . It describes the various methods used to test and inspect the metallurgical control processes in ductile iron production. The article discusses the effect of c…
Humidity-induced movements were studied on biaxially stretched samples of sized and gessoed fabric and on films of size and gesso without fabric. In-plane strains were detected through observation of crack patterns formed in a brittle coating applied on the samples. Different patterns recorded during drying and humidi…
The electrochemical behaviour of iron in methanol solutions has been investigated. In anhydrous methanol (<0.07%H2O), iron dose not exhibit definite passive behaviour. In the presence of water up to 5.0% content there is a decrease in anodic dissolution current and the passive behaviour is clearly observed. On the oth…
Ultrafine powders of β-SiC containing 15wt% free Si, which were produced by the gas evaporation method, were pres surelessly sintered. The behavior of SiC crystal growth during the sintering was observed by scanning electron microscopy (SEM). When the sintering was carried out under the condition that the upper side o…
The weight loss behavior of commercial polyglycerols (PG) and PG with various degrees of polymerization, and polyglycerol fatty acid ester (PGFE) with various carbon numbers of acyl group and various degrees of esterification was studied by means of dynamic programmed thermogravimetry (TG). The relationship between th…
A brief discussion of the nature and design of polymer-modified microsurfacing materials is followed by a study comparing the resilient modulus of field cores from a rut-filling project with laboratory-generated cores of a similar nature. Resilient modulus testing was performed at temperatures ranging from -30 to 100°…