Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"P. ŻUKOWSKI"

Physical modification of filler of elastomer compositions

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Element-based coatings (E=Cr, Mo) deposited on carbon P-324 by means of self-ion assisted deposition (SIAD) technique exhibit some advanced properties such as specific surface area. The SIAD modified surfaces of carbon were examined using investigation of the surface area and porosity by High Speed Gas Sorption Analyzer NOVA 2200 (Quantachrome Corp. USA). Introduction of the modified filling com[...]

Modification of properties of hybrid TiN/Al2O3 coatings using Electron Beam Melting

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New experimental results on studies of the structure, element and phase composition of hybrid coatings deposited on a substrate of stainless steel AISI 321 are presented using combined application of several methods of coating deposition (plasma-detonation and vacuum arc ones) with subsequent surface treatment by a high-current electron beam (HCEB). We found that an increase in the energy densit[...]

Electric properties of composite ZnO-based ceramics doped with Fe DOI:10.15199/48.2018.03.39

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Nowadays special attention is paid to the search for new ceramic materials based on wide-gap oxides, as well as to the study of their structure and properties for the purpose of their application in various areas of the radioengineering, electronic and optoelectronic industries [1]. Analysis of the literature indicates that single crystals, polycrystalline films, nanostructured powders and wires based on ZnO have been studied in sufficient detail. At the same time, ZnO-based compositions, obtained by ceramic technologies, have not been studied so well. In particular, there is no many research dedicated to the effects of ZnO ceramics doping with magnetic impurities as well as influence synthesis technology and subsequent heat treatments on the chemical and phase compositions (including the magnetic states of phases and also the type of self-defects and complexes formed on their basis, and the mechanisms of electrical conductivity of ceramics. The aim of this work is to study the structure and electrical properties of ZnO-based ceramics doped with iron using various types of FexOy doping agents. Experimental The conventional ceramic technology was used to obtain the ZnO-based samples .The initial compounds for the preparation of the charge were high-purity powders of ZnO, and FexOy (FeO, Fe2O3, Fe3O4) oxides. For preparation of the investigated samples we used the compound (ZnO)90(FexOy)10, where the mass of the FexOy powders corresponded to 10 wt. %.The initial powders were milled for one hour in agate mortar with the addition of distilled water and then dried at room temperature. After this 3% (by weight) of PVA glue was added to the powder as a binder, then mixture were mixed and compacted into tablets with press. These tablets were subjecte[...]

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