Materials Literature
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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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El empleo de la soldadura facilita la reparación de los hornos rotatorios, acortando el tiempo necesario para dicha operación. Se presentan diversos ejemplos prácticos.
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