Browsing by Author "Tessmann, Elke"
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- ItemComparison of metallic Silicon in clusions in industrial Container glass and laboratory melts(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Reisch, Renate; Stachel, Dörte; Tessmann, ElkeMetallic silicon inclusions in glasses obtained from different Container glass companies and from laboratory melts by addition of metallic cuttings (aluminum, magnesium) were examined using light and Scanning electron microscopy The composition of the formed silicon spheres is always similar. The metallic inclusions are composed of silicon with a very small part of fmely distributed iron-Silicon alloys. In amber and green glass chromium, manganese and copper are additionally enriched as further main elements in these alloying phases. Differences in the composition of silicon spheres are due to the dwell time and the concentration of polyvalent ions in the melt.
- ItemThermal behavior of metallic aluminum in a Container glass melt(Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Reisch, Renate; Stachel, Dörte; Traufelder, Steffi; Tessmann, ElkeThe thermal behavior o f metallic aluminum was studied in the temperature ränge of 1100 to 1500°C in a Container glass melt. The dissolution of the metal was determined as a function of aluminum input, glass volume, melting time and the type of glass used. By analogy, melts containing magnesium cuttings were also investigated. With the aid of electron microscopy, it was possible to establish a reaction scheme of Oxidation and reduction processes. Only 2 to 3 % of the aluminum introduced causes the formation of silicon spheres. The main part will be oxidized through reactions with oxygen, hydroxide and polyvalent ions in the melt.