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Advanced materials for the glass industry
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As the leading producer of powder metallurgical products in molybdenum and tungsten as well as Fe and Ni based ODS alloys (PM1000, PM2000), we are able to provide a complete service package from the design through to the manufacture of systems to suit customers' individual requirements.
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 PLANSEE offers a range of high-temperature materials for the melting, homogenising, feeding and shaping of glass products.
Our high-purity Mo glass melting electrodes are used in the electric melting of a variety of glasses, ranging from container to special glasses or ceramic fibres.
For homogenising and feeding special glass melts, PLANSEE offers stirrers, gobbing stirrers and plungers in Mo and oxide dispersion strengthened (ODS) alloys. While Mo stirrers are unrivalled at service temperatures greater than 1300 °C, the use of the ODS alloy PM2000 provides significant advantages for stirrers operating at lower temperatures. These stirrers are made with molybdenum parts below the glass level and PM2000 shafts above the glass and are so called ?combi-stirrers?. Only the interface area between the glass and the atmosphere has to be protected with a small platinum sleeve. This design leads to low platinum precious metal costs and is therefore of great interest for many applications, especially as a replacement for ceramic stirrers.
Tungsten or molybdenum outflow nozzles, with or without iridium inserts are used in the production of ceramic fibres, glass wool and glass fibres. Tungsten protection shields used in the production of float glass can extend the lifetime of the tin bath significantly.
The lifetime of a glass melting tank is a very important cost factor in glass production. PLANSEE custom-builds glass flow channels, molybdenum wall reinforcements and Mo glass corrosion protection shields, which contribute considerably toward increasing the life expectancy.
Recent PLANSEE developments have led to the introduction of SIBOR® and NICROM®, two protective coatings to improve the oxidation resistance of Mo. The above-mentioned SIBOR® coating makes it possible to install coated Mo parts in a cold furnace. These parts are able to withstand oxidation during the up-tempering of the tank until they are covered with glass. The coating will be washed away and dissolved after a few hours inside the glass, but without polluting or discolouring the melt.
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Photos: Plansee
Last review: June, 2005 |
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