Influence of mechanical activation on the properties of natural zeolites from Tokaj Mountain

This paper presents the results of a study of the influence of mechanical activation on morphology, specific surface area and phase composition of natural zeolite of Tokaj Mountain. During the mechanical activation of zeolites powders with specific surface area of 19-20 square meters per grams, significant changes in chemical and mineralogical compositions can be observed. The laboratory experiments had shown an intensive increase of specific surface area at the beginning of mechanical activation; a further relatively slow decrease and reduction of BET surfaces were observed. By increasing the mechanical activation time the amount of quartz, cristobalite-low, orthoclase mineral components were not stable, and their content have varied not so strongly as a decrease smectite 15 A, clinoptilolite, illite 2M1 or calcite. In addition, during the mechanical activation occurred amorphization, which was increased from 13% to 52%

The application of external fields to the manufacturing of novel dense composite master alloys and Aluminum-based nanocomposites

The possibility of producing dense and concentrated master alloys containing nanosized Al2O3 by shock-wave compacting is demonstrated. Different conditions of shock-wave process are discussed. The data of master alloys characterization are presented. The nanostructured master alloys have high density and are convenient for metallurgical handling. It is found that the use of such a master alloy with nanoceramic particles facilitates the particle introduction into the aluminum melt. The ultrasonic treatment performed during and after the introduction of the master alloy into the melt further leads to uniform distribution of strengthening nanoparticles and improvement of alloy strength and ductility. Experimental results are shown and discussed.the Ministry of Education and Science of the Russian Federation within the framework of the Federal Target Program. Agreement No. 14.578.21.0025 (Unique identifier RFMEFI 57814X0025). A.B. Vorozhtsov, S.A. Vorozhtsov, J. Tamayo and D.G. Eskin acknowledge financial support from the Exomet Project (which is co-funded by the European Commission in the 7th Framework Programme (contract FP7-NMP3-LA-2012-280421), by the European Space Agency and by the individual partner organizations)