Materials Literature
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The local hydrogen concentration in the heat-affected-zone where the root cracking occurred has been investigated using the finite difference method. The effect of groove and weld metal shapes on the local hydrogen concentration was basically examined. It is clear that the local hydrogen related with the cold cracking…
The corrosion of cobalt-nickel alloys at ambient temperatures is reviewed. In the aqueous phase, data for the anodic and cathodic half-cell reactions are reported, as also for free corrosion. Under most conditions, corrosion resistance increases with nickel content, although in certain circumstances, the 50–50 wt-% al…
The lattice sites occupied by carbon in B12C3 and B9C are examined in terms of their boron‐carbon nuclear dipolar couplings and chemical shielding anisotropies as revealed by 13C nuclear magnetic resonance spectroscopy. The 13C spin‐echo decays for B9C is more rapid than that of B12C3, which is interpreted as stronger…
In order to clarify the contribution of grain boundary effect on the work-hardening rate without recovery effect, h, and the recovery rate without work-hardening effect, r, these two parameters in pure aluminum single crystals have been measured and compared with those in aluminum polycrystals reported so far. The mea…
Twelve kinds of cellulosic fiber, including natural, regenerated, and chemically modified fibers, were prepared for measuring the moisture sorption and desorption isotherms at various temperatures from 10 to 50°C by two types of gravimetric method, a weighing bottle method and a sorption balance method with quartz spr…
Quantitative analysis by electron probe microanalyzer has been well studied and established. Many methods of quantitative analysis are provided. 1. Working curve method, 2. ZAF method and 3. Bence-Albee method are well known and used. But these methods are not suited to some specimens. 4. Convergence method and 5. SEF…
The molar volume, optical basicity, X-ray fluorescence spectra of Al Kα and X-ray photoelectron spectra of O1s, B1s and Al2p core electrons were measured for alkaline earth aluminoborate (CaBAl and BaBAl) glasses as a function of molar ratio MO/(MO+B2O3)=X (M=Ca and Ba). Inflections and discontinuities in the property…
The kinetics of the reduction by hydrogen of two series of NiO-Fe 2 O 3 mixed oxides of different composition was studied in the temperature range 320 - 410 °C using thermogravimetry. Both series were prepared from different precursors that were thermally decomposed at different temperatures. The oxidizing ability of…
The state of the art of microwave heating and drying of textile materials is discussed, along with the potential for this technology to improve the productivity of the textile industry. A complete search of the literature has revealed the important research and development which has been performed related to microwave…
The effect of heat treatment on the tensile properties and fracture toughness of Ti-10V-2Fe-3Al, a near β titanium alloy, was studied to establish the optimum manufacturing process. Fatigue properties were also investigated using heat treated specimens specified by Aerospace Material Specifications.It is found that ag…
The crystal structure of ε -Mg 2 PO 4 OH ( Pnma , a = 8.239(1), b = 6.135(1), c = 7.404(1) Å, Z = 4) was solved by direct methods and Fourier syntheses and refined to a final R -value of 0.017 for 637 high-angle reflections. Slightly distorted trans -MgO 4 (OH) 2 octahedra form chains along b by edge-sharing, the chai…
As part of its program in mineral waste management, the Bureau of Mines has investigated the effect of ion exchange on the dewatering potential of clay minerals. Clays of the smectite group possess exchangeable cations to compensate for the overall net negative charge of the clay lattice. The ratio of the valence of t…
The flame spread rates of paper sheets, in which powder retardants were applied, were measured. Retardant compounds utilized were NaHCO3, Na2CO3, water, urea, NH4H2PO4, and HPO3. This paper forcuses mainly on the effectiveness of NaHCO3. As NaHCO3 content in the paper sample increased, the spread rate (2.5 mm/s) by fl…
This paper describes a straightforward, well-defined heat stability test for stabilised or unstabilised PVC powder in which a sample is heated in a U-tube in a controlled environment and the quantity of HCl generated measured using a conductivity cell. As long as the prescribed precautions are followed the method has…
Previous experiments have demonstrated that halfwave overcoats of a low-index coating material are effective in increasing the damage thresholds of dielectric high reflector coatings (HR's) at the wavelengths of 1064 nm and 248 nm. This overcoat layer led to a 50% increase in damage threshold at 1064 nm and to a 100%…
Les cristaux de ZnS obtenus à partir de la phase vapeur à environ 1450°C ont la structure hexagonale 2H. Des transformations à l'état solide au cours du refroidissement sont à l'origine des polytypes observés, dont une liste est donnée. La stabilité de la température et de la pression au cours de la croissance est une…
Abstract The backscattered electron (BSE) signals detected by a pair of detectors in the SEM can be used for producing colour micrographs. The image corresponding to any of these signals, or to a mixture of these signals, is assigned one primary colour and two or more of these images are superimposed onto the same col…
The predicted and calculated configurations of the [001] twist boundaries in rocksalt-structured oxides have been reanalysed in terms of arrays of screw dislocations. The dislocation model is then used to predict the structure of all [001] twist boundaries in these oxides. A computer simulation confirmed the stability…
Catalytic reductions of N2O and NO by CO to N2 can be achieved at 100 °C in solutions containing Rh2(CO)4Cl2 and a base: the highest rate for the N2O reduction of 25.2 turnovers per hour in dimethyl sulphoxide was obtained using KOH as the base.
Experiments on Al2 + ZrO2 ceramics reveal higher Young′s moduli and fracture toughness after sintering in air then in hydrogen. Since X-ray measurements showed a higher monoclinic phase content in the air-sintered material, Young′s moduli of these ceramics indicate the existence of higher residual stresses associated…