Quartz Glass

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Materials used for producing glass melting electrodes have to withstand extremely high temperatures and aggressive glass melts. Molybdenum from ETI can meet these challenges.

●High melting point: 2620 Celsius

●High creep resistance

●Excellent dimensional stability

●Great electrical and thermal conductivity

●High purity

Platinum and molybdenum are the only two metals which can withstand the high temperatures and chemical corrosion caused by glass melting. However, Platinum is very expensive, therefore, molybdenum is a more economical choice.

ETI has a molybdenum protective shield for regions of the glass tank where corrosion is very critical (dog house, wall, bubbler and throat). Molybdenum tank components prevent the bricks from corrosion as molybdenum has significant higher corrosion resistance than the refractory bricks. By using molybdenum sheet tank reinforcements, the original geometry of the bricks can be preserved, which can greatly extent the tank lifetime.   To produce quartz glass, a vertical furnace is first filled with quartz sand. Then, it is melted in crucibles inside the furnace and drawn through a nozzle to form rods or place. A mandrel shaft is also used to make quartz glass rods.

Many metals start to feel the heat when the temperature reaches 2200 Celsius. However, our components made of molybdenum and tungsten can withstand this high temperature. With these refractor metals, we are capable of producing an entire heating unit for you. Our following products are particularly designed for your quartz glass production: 

Nozzles

Melting tubes from seamless (compacted/sintered) or riveted tungsten crucibles

Forged mandrel shafts

Mesh heaters and rod heating elements

Shielding

Glass wool and glass fibers are manufactured at temperatures more than 1600 Celsius. During the production, the melted liquid passes through outflow nozzles made of molybdenum or tungsten. The molten is then either blown or spun to generate the final product.

To achieve high-quality product, it is essential that the molten stream is precisely dosed and perfectly centered. Our temperature-resistant molybdenum and tungsten nozzles meet these requirements. By doping iridium and rhenium, our nozzles are of excellent corrosion resistance with long lifetime.

To make our nozzles last even longer, we have developed a special technology to join small precious metal tubes to the nozzle body.

Are you interested in some other robust components made from refractory metals? That is not a problem for us. Besides outflow nozzles made from molybdenum and tungsten, we also provide molybdenum glass melting electrodes, nozzle holders, flow needles, extension tubes, furnace components made from molybdenum, tungsten, tantalum and niobium. Of course, we are also willing to manufacture other tailored-products to satisfy your needs.