AMULET2: Smalto a bassa temperatura – componenti di rivestimento per fusibili di media tensione. Scadenza 22/03/2023

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Slovenian company is a manufacturer of high-quality and technologically advanced and sophisticated fuses, a wide and rounded portfolio of switches and circuit-breakers and technical ceramics for the global market, which are characterized by an exceptional price-quality ratio. Glaze is a glass coating on the surface of ceramic tubes. We can achieve the impermeability of the porous ceramic coating, smooth surface and shine, and we can increase the mechanical strength of the product by glazing. With colouring of the glaze, we hide the colour of the base and improve the look of the ceramics. The glaze is usually applied to the ceramic product in the form of a suspension. This is followed by drying and sintering, where the components of the glaze react, melt and form a glassy phase that fuses with the base. Under current production conditions, the glaze is sintered together with the product at temperatures around 1300°C. The thickness of the glaze application is 150 - 300μm. The development of new tube production technology presents the application of glaze – coating, great challenge. We would significantly reduce technological waste (sintering), from 25% to 5%, which cannot be avoided with existing technology. Technological waste, which is produced in its raw state, would be used as a secondary raw material in the process of preparing the material. In this way, the amount of raw material needed to produce the material would be reduced. Scope of the project is to develop a new glaze-coating that will be applied at much lower temperatures to the sintered ceramic fuses. The glaze should be electrically insulating. The current glaze material fulfils standard IEC 60672 – 3 group C120 with a sintering temperature of 1300°C and thermal expansion coefficient α 30-600 °C 4‒7 x 10-6 K-1.