Silicon Nitride Bonded Silicon Carbide (NBSC or NBSiC) is a high-performance structural ceramic combining the hardness of silicon carbide (SiC) with the strength and thermal stability of silicon nitride (Si₃N₄). Manufactured through a nitriding process, NBSC offers exceptional mechanical, thermal, and chemical resistance, making it ideal for demanding industrial applications.

Key Properties

Property

Typical Value / Range

SiC content

60% – 80%

Si₃N₄ content

20% – 40%

Free silicon

0%

Bulk density

2.75 – 2.82 g/cm³

Apparent porosity

12% – 15%

Flexural strength (20 °C)

180 – 190 MPa

Flexural strength (1,200 °C)

207 MPa

Flexural strength (1,350 °C)

210 MPa

Compressive strength (20 °C)

600 – 700 MPa

Thermal conductivity (1,200 °C)

~15 W/(m·K)

Coefficient of thermal expansion (1,200 °C)

5.0 × 10⁻⁶ /°C

Maximum service temperature

Up to 1,550 °C

Thermal shock resistance

Excellent

Advantages

  • High flexural strength and excellent oxidation resistance.
  • Capable of continuous use at temperatures up to 1,550 °C.
  • Outstanding wear resistance and corrosion resistance to molten metals such as aluminum, zinc, copper, and magnesium.
  • Stable performance under high load and high-temperature conditions.

Applications

NBSC is widely used in industries requiring structural integrity under extreme conditions, including:

  • Burner nozzles and high-temperature components
  • Thin-walled plates and slabs
  • Cylindrical tubes and rods
  • Custom-shaped structural parts for industrial furnaces and chemical equipment
  • Components exposed to molten metals, wear, and corrosion

Handling & Recommendations

  • Handle components carefully to prevent chipping or surface damage.
  • Design with gradual transitions to reduce stress concentrations.
  • Avoid sudden temperature changes to maintain thermal shock resistance.
  • Consider thermal expansion compatibility when combining NBSC with metals or other materials.