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SM ISO690:2012 SHARAGOV, Vasile, BURCOVSCHI, Ion. The influence of the electric fields on the intensification of dealkalization of industrial glasses with gaseous reagents. In: The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova, 28-30 mai 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Chimie al AȘM, 2014, p. 182. |
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The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova 2014 | ||||||
Conferința "The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova" Chișinău, Moldova, 28-30 mai 2014 | ||||||
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Thermochemical treatment of glassware with gaseous reagents is the simplest method to |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Şaragov, V.A.</dc:creator> <dc:creator>Burcovschi, I.A.</dc:creator> <dc:date>2014</dc:date> <dc:description xml:lang='en'><p>Thermochemical treatment of glassware with gaseous reagents is the simplest method to<br />improve the surface properties of glass. The main disadvantage of this method of treatment is the<br />low depth of dealkalization layer (about 1 m in the case of industrial glassware), so it has a<br />smaller effect in comparison to other strengthening methods i.e. ion exchange, etching in<br />hydrofluoric acid and tempering [1]. Due to the same reason, during the operation of glassware<br />their modified layers are rapidly destroyed and there is a degradation of glass strength. Hence,<br />the wide use of this method is due to the increased thickness of dealkalized layer. It is known<br />that electric, magnetic and acoustic fields significantly affect the chemical processes [2]. The<br />effect of physical fields on chemical interaction between acid gases and glass has not been<br />described in literature.<br />The aim of the undertaken experiments was to investigate the influence of electric fields<br />on the process of dealkalization of industrial glassware with gaseous reagents.<br />The subjects of investigation were various types of industrial glassware: sheet glass<br />samples, containers (bottles, jars and flasks) of colorless glass, bottles of green glass, ampoules<br />made from medical glass, illuminating glassware made from transparent colorless and milk<br />glasses, laboratory and assorted glassware. SO2, NO2, HCl, CF2Cl2, CHF2Cl and mixtures of<br />these gaseous reagents (CF2Cl2 + SO2, CHF2Cl + NO2, SO2 + HCl etc.) were used as gaseous<br />reagents.<br />The samples of glass were exposed to thermochemical treatment with gaseous reagents in<br />the electric fields both in laboratory and industrial conditions. The main regimes of<br />thermochemical treatment of glass are the following: temperature - between 300 and 600 oС,<br />duration - between 1 s and 2 h, quantity of gas reagent introduced into the reacting vessel -<br />between 0.01 and 1.00 mol, voltage value - up to 5 kV.<br />The intensity of glass dealkalization by acid gases was estimated using the extraction rate<br />of alkaline cations [3]. During the first stage of investigation we determined the rate of<br />dealkalization of industrial glasses with different gaseous reagents based on the optimal regime<br />of thermochemical treatment in laboratory conditions. In the following experiments the<br />thermochemical treatment was repeated, but under the influence of electric fields (constant and<br />alternating). We have established that the rate of dealkalization of industrial glasses with gaseous<br />reagents under the impact of electric fields has increased by 2-3 times. The results achieved may<br />be explained by the voltage value, shape, material and size of the electrodes, the distance<br />between the electrodes etc. Similar results have been obtained for industrial experiments.<br />References:<br />[1] Бутаев, А. М. Прочность стекла. Махачкала: Дагестанский государственный<br />университет, 1997, 253 с.<br />[2] Poller, S. Chemie auf dem Wege ins dritte Jahrtausend. Leipzig – Jena – Berlin: Urania –<br />Verlag, 1979, 400 p.<br />[3] Sharagov, V., Duca, Gh. Increasing physical and chemical properties of annealed hollow<br />glassware as well as of those stored and used. Romanian Journal of Materials. 2013, nr. 43<br />(2), 218-222.</p></dc:description> <dc:source>The International Conference dedicated to the 55th anniversary from the foundation of the Institute of Chemistry of the Academy of Sciences of Moldova () 182-182</dc:source> <dc:title>The influence of the electric fields on the intensification of dealkalization of industrial glasses with gaseous reagents</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>