Browsing by Author "Buerhop, Claudia"

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    Enamelling of glass by CO₂ laser treatment
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1995) Buerhop, Claudia; Weißmann, Rudolf
    Decoration of glass using enamel is interesting for hollow glassware as well as for flat glass sheets. Laser radiation can be used advantageously to increase the temperature of the product locally. The reactions which take place during CO₂ laser heat treatment of a conventional PbO-containing frit are discussed intensely. Pyrometrical temperature measurements accompany the experiments to investigate the temperature development during CO₂ laser irradiation. At temperatures above Tg optimal results concerning low surface roughness, high brightness and intensive colouration are obrained without deformation of the shape of the product. Very promising results show that higher temperatures can be achieved by laser application and therefore PbO-free frits can be used.
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    Firimg PbO - free glass enamels using the CW - CO₂ laser
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1996) Hahn, Karlheinz; Buerhop, Claudia; Weißmann, Rudolf
    The firing of glass enamels, which are applied to decorate glass products, is usually done in a furnace. A new and suitable technique for firing glass enamels is to make use of the high-power CW-CO₂ laser. Its be am (wavelength 10.6 μm) induces a very fast heating of the enamelled glass within a small surface layer. This makes it possible to fire glass enamels at temperatures above 1000°C, without any deformation of the Substrate glass body In this temperature ränge an amount of the harmful component PbO in t he glass enamel is n o longer necessary The PbO-free glass flux of the enamel is made easily by milhng the Substrate glass (float glass). The gloss and smoothness of the laser-fired enamel are comparable to the conventionally fired enamel. The absence of PbO and the high firing temperatures are very advantageous to the chemical resistance of the enamels, meaning excellent dishwasher durability.
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    Surface treatment of glass and ceramics using XeCI excimer laser radiation
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1993) Buerhop, Claudia; Lutz, Norbert; Weißmann, Rudolf; Tomandl, Gerhard
    A XeCl excimer laser with uniform beam profile and 308 nm wavelength was used for ablation and surface modification of technical glasses and ceramics.The ablation behaviour and the resulting surface morphology of the different materials were measured in dependence upon the energy density and the number of pulses. In contradiction to ceramics, glasses show a higher ablation threshold and considerable higher ablation rates. Due to the short wavelength of the excimer laser, microstructuring of glass and ceramic surfaces is possible. Examples are presented, like marking of glasses, microline structuring of float glass, as well as positive and negative microstructuring of ceramics.