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Molybdenum rotary tube

Molybdenum rotary tubes

Rotary kilns are used to incinerate hazardous waste and for calcination processes, among other things. The rotary tube in the interior of the kiln must be able to withstand temperatures up to 1400°C non-stop. This is because it is continually being filled with material. Usually, rotary kilns run 24 hours a day for weeks.

Kiln repairs are time- and cost intensive. Components that function without problems are required in order to ensure that the service life of the rotary kiln (kiln campaign) is as long as possible. We supply rotary tubes made of molybdenum and its alloys for this purpose. These multi-layered and riveted components can withstand high temperatures with ease.

Your advantages at a glance:

  • Can withstand
    high temperatures up to 2800°C

  • Excellent creep behavior

  • Good dimensional
    stability

  • High purity

  • Excellent
    corrosion resistance

  • Low coefficient of
    expansion

Molybdenum, tungsten, and TZM for the highest temperatures

Molybdenum and tungsten are refractory metals and thus are very heat-resistant. Due to their special physical properties, molybdenum and tungsten are ideally suited as components for furnace construction.

When particular loads are required, we strengthen the microstructure of pure molybdenum with TZM – titanium and zirconium. TZM has better creep resistance, a higher recrystallization temperature, and higher heat resistance than pure molybdenum. A Mo-Ti solid solution and Ti-Zr carbides ensure optimal strengths at temperatures up to 1400°C.

See our Materials section for more information about the characteristics of our materials:

Our materials

Sibor® – our guarantee against oxidation

Sibor® coating

Molybdenum begins to oxidize at temperatures over 400°C. Our solution: Sibor® – our oxidation protection for molybdenum. Sibor® protects molybdenum from oxidation up to 1700°C. The very hard, dense coating creates a diffusion barrier along the base material and forms an SiO2 seal against the air.

Sibor® coating

Sibor®-coated molybdenum components can be heated and cooled quickly without the coating separating. The guaranteed duration of effect for oxidation protection:

  • 5000 h at 1250°C / 2282°F
  • 500 h at 1450°C / 2642°F
  • 50 h at 1600°C / 2912°F

Customized rotary tubes

With 100 years of experience and processing knowledge of refractory metals, we can customize our materials optimally to your applications. We have a design team of more than ten engineers specializing in thermal processes. They will work together with you to find solutions for your specific applications. The sky's the limit with regards to the design.

Our development team will adapt your rotary tube optimally to your process. Using FEM simulations, we can predict how our components will behave in your high-temperature process even during the design phase.  We would also be happy to provide you rotary tubes in trial sizes.

Whether remotely or on-site – we are here for you

Regardless of whether you need an entire hot zone or a spare part for your existing furnace, naturally we would be happy to install our products for you on-site. Our experts can also handle the inspection, maintenance, and optimization of your existing furnaces.

Remote service

Should repairs become necessary, that is a task that we would be happy to take care of for you on-site. If desired, our experts can also provide a remote service to support your needs. This can often quickly answer questions and resolve problems, significantly reducing downtimes.

Further products for high-temperature processes

Whether for annealing furnaces and soldering processes, coating systems, 3D printing sintering equipment, MIM furnaces, sintering furnaces, HIP processes or single crystal growing – our products made of molybdenum, tungsten, tantalum, and niobium can withstand the highest temperatures:

Is your product not yet included? Get in touch and we'll be happy to develop a tailor-made solution for your specific application.