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Author: Fleischmann, Bernhard × Has files: Yes × Type: article × Version: publishedVersion × Publisher: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft ×

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    Development of an ultrasonic method to determine the residual thickness of refractory blocks
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1993) Fleischmann, Bernhard; Faber, Anne J.; Breeuwer, René
    An ultrasonic method was developed to measure the residual thickness of refractory blocks at an operating glass melting furnace. This ultrasonic measuring method was used to determine the thickness of zirconia-based refractories on a small laboratory glass melting furnace. Two ultrasonic transducers with a silica delay and a coupling media were used to measure the transition time, that the ultrasonic signal needs with the applied echo method. The results of the thickness measurements at cold and hot refractory blocks were compared. The investigations prove the possibility to employ the ultrasonic device for determining the residual thickness of refractory blocks.
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    Industrial experience with a cathodic electrochemical method to reduce the molybdenum electrode corrosion
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1993) Fleischmann, Bernhard; Mergler, Kurt Wilhelm; Barklage-Hilgefort, Hansjürgen
    In an industrial all-electric glass tank a cathodic dc voltage was superimposed on the ac heating voltage at two molybdenum electrodes for about 8 months to reduce the corrosion through the formation of a protective layer. One starting electrode could be used as counter electrode for the cathodic protection of the molybdenum heating electrodes. A platinum electrode was installed as reference electrode to carry out electrochemical measurements (impedance measurements, current-potential curves). After an 8 months' running time a reduction of molybdenum corrosion of about 25 % could be proved due to the cathodic protection in comparison with unprotected heating electrodes. The results of the electro chemical investigations on the industrial glass tank showed to a certain extent deviations from the former laboratory tests.