Zhengzhou Brother Furnace Co.,Ltd


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Silicon Nitride (Si3n4) Thermocouple Protection Tube

Silicon Nitride (Si3n4) Thermocouple Protection Tube

Silicon Nitride(Si3N4) protection tubes
Density: 2.8 g/cm3 Porosity: ≤16%

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    Silicon Nitride (Si3N4) Bonded SiC thermocouple protection tube is mainly used in the production of aluminum, copper and zinc, as the lining material of the molten pool and electrolytic bath (reduction bath). The side lining of the reduction bath is eroding by aluminum and cryolite (used as additive), but Si3N4 bonded SiC material could not be eroded by aluminum, and do not have chemical reaction with cryolite. So this kind of material is ideal for the lining bricks of the electrolytic bath. In particular this kind of bricks have the excellent properties of high strength, abrasive resistance and nonconductive, so the copolymer (Al2O3 and Cryolite). The copolymer likes protective film to protect the working lining and improve the service life of electrolytic bath. At the same time, the Si3N4 bonded SiC bricks have lower thermal conductivity than silicon bricks, so they can reduce the thickness of the side wall or input higher power to expanse the loading capacity of the electrolytic bath, and to increase the output. Because of the high resistivity of the material, it can reduce the power consumption of the side -wall about 15%, saving energy and protecting environment.

    1. Best producing technology in China. Our tubes can be instead of Japanese tubes in Aluminium melt furnace.
    2. Very smooth surface to avoid any blotted metal liquid.
    3. Good thermal conductivity.
    4. High tempreature strength
    5. Special groove to be easy fixed.
    Technical Specifications


    2.8 g/cm3



    Phase composition

    ß-Si3N4, Oxide





    compressive strength


    flexure strength


    Thermal   conductivity

    16 w/m*k

    Standard size (in stock):
    OD28 x ID16 x Length 200-1500mm
    OD45 x ID25 x Length 200-2000mm
    OD50 x ID25 x Length 200-2000mm
    Delivery time: 3-5 days
    Other Size: customizable according to different moudle

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