| Abstract [eng] |
The main purpose of the work – create high contrast hydrophobic textures on special glass-ceramics using ultrashort pulses. In this work glass-ceramic material are mostly used for induction cooktops. There are not many marking examples of glass-ceramic material and examples of creating hydrophobic surfaces on this type of material are close to none.In literature analysis we presented laser marking advantages, types of laser marking and how laser parameters determine marking contrast, depth and width on the glasses. Also presented what determines hydrophobic surface, howto get hydrophobic surfaces, analyzed few examples of hydrophobic surfaces on the glass, showed our results, manufacturing methods and what laser parameters were used. In this work to get good contrast and hydrophobic surfaces we used two different marking systems which had CARBIDE laser from “Light Conversion UAB, Vilnius’’. While searching for good parameters to achieve good contrast changeable parameters were laser power, pulse duration, pulse repetition rate and scanning speed. Laser parameters was not changed manufacturing hydrophobic surfaces, but we were changing scanning speed, texture types and models. Contrast was analyzed measuring red, green, blue colour values. Marked surfaces and marks also was analyzed using microscope and profilometer. Hydrophobicity of created structures was analyzed measuring contact angle between water droplet surface and material surface when laser droplet lands on the surface. In conclusion of our research laser parameters and scanning speed values are mentioned, where we were able to get white marks with good contrast. There were wide range of good laser parameters to get white marks with good contrast and we presented and researched 20 good mark examples. Using only laser texturing we were not able to get hydrophobic surfaces and all laser textured surfaces remained hydrophilic, highest contact angle was 28⁰. However when surface was coated with hexamethyldisilazane, contact angle increased and hydrophobic surface was made with contact angle of 92,6⁰. |
