Materials Literature
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The effects of various gaseo us atmospheres on the thermal decompositi on of p oly tetrafiu oroet hy lene have been investigated in t he ran ge 450 0 to 500 0 C. Bot h cata ly sis a nd inhibit ion wer e obser ved . The inhibitor y su bstan ces, chlorine, hydrogen, carbon tetrachloride, and t oluen e, all produ ced m a…
A study is made of the various factors influencing the values obtained from Micronaire tests made on samples of cotton. It is shown that both fibre fineness and maturity affect the measurements and a calibration of the scale of the instrument is made in terms of a simple function of these two quantities. The interpret…
The crystal-chemical basis of the relationship between hydrated calcium silicate and clay minerals is discussed, and a review is given of recent work on the tobermorite minerals, the group of hydrated calcium silicates which most nearly resembles the clay minerals. New data are presented for the specific gravities, re…
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Anodic corrosion of lead in sulfuric acid was studied in detail at potentials near the reversible potential. Results indicate that the first step in the corrosion process was reaction of lead with water to form lead dioxide. The solid‐phase reaction probably occurred below a certain potential, and this reaction plus t…
Abstract If the surface of a polyethylene film is subjected to certain treatments, printing on the surface becomes possible, or, in other words, the bonding properties of the polyethylene film are improved. Two forms of treatment, involving the use of a Tesla coil discharge at atmospheric pressure and of a glow discha…
Experimental measurements of jet velocity and of penetration velocity as functions of depth of penetration are described for lined cavity charges fired into several types of target material and under a variety of experimental conditions. The results show that the hydrodynamic theory of penetration of Pugh and of Hill,…
Recently Shore and Parry described a new compound, H_3NBH_3, and as evidence of crystallinity they outlined its X-ray diffraction powder pattern. From these data it has proved possible to determine its crystal structure
A phase diagram of the system A1 2 O 3 ‐A1 4 C 3 is proposed. Two intermediate oxycarbides, A1 4 O 4 C and A1 2 OC, were established. Eutectic melting between alumina and A1 4 O 4 C occurred at 1840° C. No other low melting was observed. The alumina phase was not corundum but was similar to delta‐alumina. Because of t…
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This paper presents a theoretical analysis of diffusion processes during the oxidation of an alloy when oxides of different alloying elements are formed concurrently. For idealized conditions it is possible to calculate the decrease in the oxidation rate which results from alloying a base metal, having a relatively hi…
A study has been mad e by X-ray diffract ion analyses of t he A20 3 :2B02-type double oxides. It was found that many of t hese mixed oxides, after appropriate heat treatment, formed compounds of the formula type A2B20 7 Most of these compounds crystallized in the cubic system with a face-centered cell similar to that…
I . Factors controlling pitting corrosion and laboratory methods used for its study are reviewed. An electrolytically accelerated test was developed for investigation of pit initiation. A controlled direct current was passed through a cell whose anode was the stainless steel specimen and whose electrolyte was the pitt…
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BY CONMARROBINSON BY CONMARROBINSON Research Laboratory, CourtauIds Ltd., Maidenhead, Berks Receired 29th June, 1955 The birefringent solutions of poly-y-benzyl-L-glutamatein several solvents have been studied. These show parallel equidistant lines which are visible even in natural light. The periodic
Ventajas del método de prensado en seco en la industria cerámica. Consideraciones sobre la cocción a temperatura baja.
Interés del empleo de ladrillos refractarios aislantes en la construcción, de hornos cerámicos con el f in de tener una mayor economía de combustible, un aumento de la producción, mejor calidad de las piezas y reducción en el coste de construcción.
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