Nitride bonded silicon carbide riser tube is used in non-ferrous metal casting industry, especially in aluminum alloy wheel low-pressure casting industry.


Composition 74% SiC+23% Si3N4
Bulk Density g/cm3 2.5
Flexural Strength MPa 120
Apparent Porosity % <20
Coeff of Thermal Exp 4.5x10-6
Thermal Conductivity (1200°C) W/m.K 15


  • Good thermal shock resistance, no slag, no cracking under high temperature
  • Gas-tight
  • Can not be wetted by non-ferrous metal melts such as aluminum liquid
  • Excellent corrosion resistance.


To extend the service life of our NBSC riser tubes, two coatings can be applied:

  • Antioxidation coatings for inwall and outerwall
  • Anti-slag(aluminum) coating (e.g. BN)

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