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    AI Overview
    Alumina - McDanel Advanced Material Technologies
    Alumina tubes in vacuum applications are high-temperature ceramic components used in furnaces for processes like sintering, heat treatment, and CVD, offering excellent electrical insulation, chemical resistance, and ability to withstand extreme heat (up to ~2000°C in vacuum), providing a sealed, inert environment for materials processing, though typically limited to around 1500°C under high vacuum to prevent cracking. 
    Key Characteristics & Uses 
    • High-Temperature Stability: Alumina (aluminum oxide) tubes can operate in vacuum environments up to 2000°C, though operation above 1500°C under vacuum requires careful control to prevent cracking.
    • Chemical Inertness: Resists strong acids, alkalis, and corrosive substances, making them ideal for various material processing.
    • Electrical Insulation: High purity alumina provides superior electrical resistivity at high temperatures, essential for many applications.
    • Thermal Shock Resistance: Low thermal expansion and high thermal conductivity offer good resistance to rapid temperature changes.
    • Applications: Used as furnace tubes, thermocouple protection, laser tubes, and in CVD/diffusion processes for electronic materials, rare earths, and alloys. 
    How They Work in Furnaces 
    • Sealed System: Paired with vacuum flanges and valves, alumina tubes create a sealed chamber within a furnace.
    • Atmosphere Control: Allows for heating under vacuum or specific gas mixtures (like Argon, Nitrogen, Oxygen) for controlled material reactions.
    • Vacuum Generation: Vacuum pumps are used to evacuate the tube, creating low-pressure conditions (e.g., 10⁻⁵ to 10⁻⁷ Torr). 
    Important Considerations 
    • Temperature Limits: Never use alumina tubes above ~1500°C in high vacuum; higher temperatures in air are possible but vacuum operation has stricter limits.
    • Heating/Cooling Rates: Slow heating and cooling (e.g., < 5°C/min) and controlled thermal gradients are crucial to prevent cracking.
    • Material Compatibility: Avoid using graphite crucibles inside alumina tubes. 
    • 1700C Single Zone Alumina Tube Furnace with 3 Channel Gas ...
      GSL-1700X-F3LV tube furnace is a CE certified alumina tube furnace with mechanical vacuum pump and three channels gas flowing syst...
      MTI Corporation
    • 1700°C High Temperature Tube Furnace with Alumina tube ...
      PT D80/300/17 Tube Furnace features high alumina ceramic tube with SS304 sealing flanges, heated by MoSi2 rods, Tmax 1700 degree C...
      www.programtherm.net
    • Order a Alumina Ceramic Tube Online - Sentro Tech
      Alumina combines low thermal expansion, superior thermal conductivity, and high-compressive strength to make these furnace tubes t...
      SentroTech
    Show all
    • 1700C Single Zone Alumina Tube Furnace with 3 Channel Gas ...
      GSL-1700X-F3LV tube furnace is a CE certified alumina tube furnace with mechanical vacuum pump and three channels gas flowing syst...
      MTI Corporation
    • 3.15" x 40" (80 OD x 74 ID x 1000mm L) Alumina Ceramic Tube
      3.15" OD larger diameter Alumina tube is made of high purity 95% Al2O3 material. Such alumina tube can be used at operating temper...
      MTI Corporation
    • 1700C Tube Furnace with High Vacuum System (10^-4Torr) & (2-4 ...
      * How to use and maintain Alumina tube in MTI high-temperature tube furnace. * In order to obtain accurate temperature inside the ...
      MTI Corporation
    • 1700°C High Temperature Tube Furnace with Alumina tube ...
      PT D80/300/17 Tube Furnace features high alumina ceramic tube with SS304 sealing flanges, heated by MoSi2 rods, Tmax 1700 degree C...
      www.programtherm.net
    • Order a Alumina Ceramic Tube Online - Sentro Tech
      Alumina combines low thermal expansion, superior thermal conductivity, and high-compressive strength to make these furnace tubes t...
      SentroTech
    • Ceramic Tubes for Vacuum and Sintering Furnaces
      These ceramic tubes are used in vacuum and sintering furnaces. Among other things, they are used as a passageway from the furnace'
      Schunk Group
    • Alumina Tubes & Rods - Precision Ceramics
      High Temperature Ability – Alumina can be used in both oxidizing and reducing atmospheres up to 1650°C (2900°F) and in vacuum envi...
      Precision Ceramics
    • Compact 1600C Tube Furnace with 50mm Alumina Tube ...
      GSL-1600X-50-UL is acompact 50mm (2") tube furnace with Kanthal 1650 oC Grade SiC Rods heating elements. It is widely used in mate...
      MTI Corporation
    • 1500°C Split Tube Furnace with Flanges & 2"or 3" Alumina Tube
      OTF-1500X-UL series furnaces are split-able alumina tube furnaces with SiC heating elements. The furnace can be installed with 2"o...
      MTI Corporation
    • 1600°C Split Tube Furnace w/ Vac. Flanges & Valves, Optional 60 or ...
      * The tube furnaces with alumina tube are designed for using under vacuum and low pressure < 0.02 MPa. * Never use graphite crucib...
      MTI Corporation
    • Alumina - McDanel Advanced Material Technologies
      Typical Uses. Noble metal thermocouple protection, furnace tubes, high temperature vacuum furnaces, heat treating furnace rollers,
      McDanel Advanced Material Technologies
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    Compact 1600C Tube Furnace with 50mm Alumina ...


    MTI Corporation
    https://mtixtl.com › Equipment › Furnaces › Tube Furnace
    MTI Corporation
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    High-quality alumina tube, vacuum flanges with valves, and pressure gauge are included for immediate use. The tube furnace can be placed into a glove box to ...Read more

    Alumina Ceramic Process Tubes, Open Both Ends


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    Order a Alumina Ceramic Tube Online - Sentro Tech


    SentroTech
    https://www.sentrotech.com › Ceramic Tubes
    SentroTech
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    Sentro Tech alumina furnace tube models come with elevated dielectric properties and offer a higher vacuum or protective atmosphere at an extreme temperature.Read more

    Alumina Tubes for High Temperature


    CS Ceramic Co.,Ltd
    https://www.csceramic.com › blog
    CS Ceramic Co.,Ltd
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    The heat produced by the element causes the walls of the tube to expand, which creates a vacuum inside the tube. This allows air to flow through ...Read more

    Alumina Tubes & Rods


    Precision Ceramics
    https://precision-ceramics.com › Ceramic Materials
    Precision Ceramics
    https://precision-ceramics.com › Ceramic Materials
    High Temperature Ability – Alumina can be used in both oxidizing and reducing atmospheres up to 1650°C (2900°F) and in vacuum environments up to 2000°C (3600°F) ...Read more

    Alumina


    McDanel Advanced Material Technologies
    https://mcdanelceramics.com › alumina
    McDanel Advanced Material Technologies
    https://mcdanelceramics.com › alumina
    Alumina (Al2O3) is a hard, chemically resistant material and has the ability to withstand very high temperatures in aggressive environments.Read more

    Ceramic Tubes for Vacuum and Sintering Furnaces


    Schunk Group
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    These ceramic tubes are used in vacuum and sintering furnaces. Among other things, they are used as a passageway from the furnace's periphery to the hot zone ( ...Read more
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    1700C 2-Zone Tube Furnace with Vacuum Flanges & ...


    Scientific Solutions
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    Furnace tube is sealed by stainless steel vacuum sealing flanges, it can be used under vacuum and other gases condition. This tube furnace is an ideal tool for ...Read more

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