Browsing by Author "Wöhrmeyer, Christoph"

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    Corrosion resistance of binding and matrix phases in basic checker bricks for the middle regions of glass furnace regenerators
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1990) Wöhrmeyer, Christoph; Routschka, Gerald
    Long-time stability of basic checker bricks in the regenerators of glass melting furnaces depends mainly on the choice of their binding phase. By means of thermodynamical calculations and corrosion tests it was looked for corrosion-resistant binding and matrix phases for basic checker bricks for the regenerators of oil- and mixed oil-gas-fired flat and hollow glass melting furnaces. It was demonstrated that for a use in the middle regions of regenerators the binding phase has to withstand the combined attack of Na2SO4 and SO3. The reaction behaviour of a large number of ceramic phases was explained under this aspect. It was shown that MgTiO3 and the solid solution MgAl2O4—Mg2TiO4 possess a high corrosion resistance against SO3 and Na2SO4 comparable with that of magnesium aluminium spinel. With these titanium-containing phases a protective coating can be produced for instance on magnesia grains. This coating prevents a contact of Na2SO4 and SO3 with the periclase and thus its destruction through the forming of sodium magnesium sulphate. MgTiO3 and the solid solution MgAl2O4—Mg2TiO4 may be a suitable binding and matrix phase for magnesia-containing bricks.
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    Studies on the behaviour of magnesia, spinel and forsterite refractory bricks under simulated service conditions in the middle regions of oil-fired glass furnace regenerators Part 1. Corrosion tests and hot-mechanical behaviour of the test bricks
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1990) Routschka, Gerald; Wöhrmeyer, Christoph; Gebhardt, Franz; Ulitzka, Stanislav
    The aim of the studies was to find better corrosion-resistant bricks for highly stressed checkerworks in the condensation zone of glass furnace regenerators. 30 refractory model brick grades of the systems magnesia-forsterite, magnesia-zircon and magnesia-magnesium aluminium spinel with different types of binding and matrix phases, respectively, were exposed to the corrosive attack of sodium sulphate and SO3 in laboratory tests and a checker corrosion test. Strength measurements and thermal shock resistance tests characterise the changes in hot-mechanical behaviour by Infiltration of sodium sulphate melt and attack by SO3.
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    Studies on the behaviour of magnesia, spinel and forsterite refractory bricks under simulated service conditions in the middle regions of oil-fired glass furnace regenerators Part 2. Mineralogical and microchemical examinations
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1990) Routschka, Gerald; Wöhrmeyer, Christoph; Gebhardt, Franz; Ulitzka, Stanislav
    The microscopical and microchemical studies of the present second part give information on the corrosion resistance of the individual components of the test bricks. The results of the research led to prerequisites for a checker brick with high resistance to Na2SO4 infiltration and SO3 attack.