Materials Literature
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Paramagnetic susceptibilities of Fe and Fe-Si alloys (5.75, 6.82, 9.45, 12.65, 14.70, 18.11, 20.85, and 24.38 at. % Si) have been measured up to 1200°C. At high temperatures the paramagnetic susceptibilities of bcc Fe-Si alloys obey the Curie-Weiss law, possibly indicating that the contribution due to s-d exchange int…
Abstract Films of low‐density polyethylene which were exposed to a corona discharge in oxygen at a pressure of 1 atm. lost weight and decreased in thickness due to oxidation of the surface to volatile products (principally carbon dioxide and water). The weight loss was directly proportional to the time of exposure and…
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Abstract The polymerization rate of N-carboxy dehydroalanine anhydride (I) was compared with that of N-carboxy Dl-alanine anhydride, and it was found, that the former was much slower than the latter at 30°C. Polydehydroalanine (IV) was obtained by heating the substance I in dry pyridine at 100°C, or by adding a small…
The effect of hardness, surface finish, and grain size upon the compressive rolling-contact fatigue strength of M-50 bearing steel has been studied. Considerable testing on the RC Rig and statistical-treatment methods have been included. A mathematical expression relating these variables to life expectancy is presente…
Design rules proposed rules take account of reduction in strength near welds in heat treated or strain hardened material, at same time taking advantage of strength of material in regions not affected by heat of welding; proposed rules are conservative yet more realistic than previously used design procedures for welde…
This study covers the development of a new basic brick with outstanding resistance to load deformation, slagging, and spalling. This brick is made of 92% high‐purity periclase and 8% high‐purity alumina. During firing for a ceramically bonded brick or in service for a chemically bonded brick, the fine periclase and al…
A Pembina montmorillonite clay has been activated with sulphuric acid at various dosages by the conventional wet process and by the new "dry" process. The products are compared with respect to the fractions of the metal ion components remaining after leaching, the hydrated silica content, the bleaching capacity, and t…
A variety of naturally occurring forms of calcium sulphate dihydrate produce substantially identical differential thermograms under conditions of uniform heating rate and particle size. These thermograms closely resemble those for synthetic dihydrate and β-hemihydrate, showing four endothermic effects and one exotherm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation of Alkene TrithiocarbonatesJohn A. Durden, Harry A. Stansbury, and William H. CatletteCite this: J. Am. Chem. Soc. 1960, 82, 12, 3082–3084Publication Date (Print):June 1, 1960Publication History Published online1 May 2002Published inissue 1 June 1960https://p…
Transmission electron microscopy has been applied to the study of lattice defects introduced by neutron irradiation of graphite. The dark-field technique has proved to be especially useful for this purpose. The technique of preparation is described and a tentative interpretation of the observations is given.
Abstract The course of secondary crystallization in several polymers was investigated by the density balance method. At the end of primary crystallization it was possible to notice a stepwise increase of density with time, which cannot be fitted to the Avrami equation. The stepwise increase of density follow a further…
Calibration curves of X-ray intensity vs specimen thickness have been prepared for the electron probe microanalyzer by using evaporated films of Cr, Mn, Zn, and Au in the 0–5000 A range. For each element, the x-ray intensity increased almost linearly with thickness; for a given thickness, the x-ray intensity increased…
An apparatus is described for the measurement of the frequencies of resonance of longitudinal and torsional vibrations of circular cylindrical rods at temperatures in the range -180 to +195° C. The values obtained have been used to determine the elastic moduli of single crystals of tin over this range of temperature.…
Abstract The differences in thermal decomposition behavior previously observed between linear and branched polyethylenes have been explored experimentally by investigating and comparing the rates of volatilization of a series of twenty polymers. Similar differences were observed between linear and branched polypropyle…
The literature on the mineralogy and petrology of the scapolite family is reviewed. The general formula was examined in the light of 126 analyses from the literature, together with 9 new analyses. Of these 135 analyses, refractive indices were available for 64. Sixty-four of the analyses were rejected as unsatisfactor…
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Single crystals of PbTe have been heat-treated in evacuated silica tubes in the presence of Pb- or Te-rich ingots. At the heat-treatment temperatures, which ranged between 404° and 885°C, the ingot compositions were such that solid PbTe, liquid, and vapor phases coexisted. At a given temperature, the PbTe crystals wer…
Large area single crystals of Cu2O were grown by the process of high temperature annealing. Cu2O was prepared in finely polycrystalline form by the complete oxidation of Cu plate in air at temperatures of 1020°C to 1050°C. Subsequent annealing of the polycrystalline plates at higher temperatures allowed secondary recr…
Abstract Several polyamides crystallize from dilute glycerin solution as single crystals and spherulites possessing a lamellar structure. The crystal of nylon 6 are rhombohedral and thicken by spiral growth of lamellae from screw dislocations. Electron diffraction patterns indicate that the molecules are folded within…