Heat resistance of fused and cast baddeleyite-corundum refractories

Conclusions The heat resistance of specimens from different zones of BKCh-33 production parts was investigated by the method of radial thermal flow. Specimens the microstructure of which is distinguished by the minimum quantity of defects, a fine crystalline structure of the products of combined crystallization of baddeleyite and corundum, and uniform distribution of glassy phase have the highest heat resistance, which should be taken into consideration in the production of refractories in industry.Translated from Ogneupory, No. 4, pp. 49–53, April, 1987.     

Dehydration,rehydration, and drying sensitivity of Troshkov clays

Conclusions Kaolinite clays and kaolins adsorb small quantities of moisture and loss it almost completely at 100°C. Bentonites adsorb twice as much water and give it off over a, longer period. Dehydration of Troshkov kaolinite clay (dry variety) is the same as in Latnensk and Novoshveitsarsk clays. Dehydration of Troshkov kaolinite-montmorillonite clay (semidry and brittle varieties) is close to the dehydration of bentonites.Removing the adsorbed moisture from the montmorillonite is the main cause of the proneness of some varieties of Troshkov clays (brittle and semidry) to cracking.Preliminary processing at 300–400°C of Troshkov clays containing montmorillonite produces partial dehydration, lowers rehydration, and reduces their drying sensitivity.Translated from Ogneupory, No.1, pp, 23–29, January, 1970.     

Quantitative chromatographische Analyse Petroselinsäure-haltiger Öle

Quantitative Chromatographic Analysis of Oils Containing Petroselinic Acid A method is described for the analysis of the component fatty acids of oils containing petroselinic acid, based on columnar partition chromatography of the natural acids and of their oxydation products, obtained after E. von Rudloff. The method is illustrated by the analysis of the seed oils of Foeniculum vulgare L., Coriandrum sativum L. and Pimpinella anisum L. of Bulgarian origin.     

Acceleration of electrocatalytic reactions by pulsation of potential: Oxidation of formic acid on Pt and Pt/Pbads electrodes

Pulsating potential electrolysis has been applied to one typical electrocatalytic reaction ie, the oxidation of formic acid on platinum and platinum partially covered by lead adatoms electrodes. It has been found that much higher average cds can be obtained with such regimes than in constant potential electrolysis. The effect can be of considerable interest for the application in electrochemical power sources. An analysis of the mechanism of effects of pulsating potentials has been given. A calculated frequency dependence of the average current density is in agreement with experimental one for both electrodes.