Sample Products

Silicon Nitride Ceramics Si3N4

Silicon nitride ceramics is superior to other materials due to its thermal shock resistance. It does not deteriorate at high temperatures, so it’s used for automotive engines and parts for gas turbines, including the turbocharger rotor.
Ortech offers a complete family of Silicon Nitride materials. These materials have the following key characteristics: No adhesive wear against steel, Twice as hard as tool steel, Good chemical resistance and 60% less weight than steel.

Manufacturing Options

Advanced Finishing Services

  • Precision grinding and lapping
  • Laser machining
  • Engineering design and support
  • Complex cleanroom assemblies

Material Properties Silicon Nitride

Density gm/cc 3.20
Crystal Size (Average) Microns –
Water absorption (open porosity) % 0
Gas permeability % 0
Color ¯ Gray
Flexural Strength (MOR) 20°C MPa (psi x 103) 900
Elastic Modulus 20°C GPa (psi x 106)  315
Poisson’s Ratio 20°C ¯  –
Compressive Strength 20°C MPa (psi x 103)  2500
Hardness GPa (kg/mm2)  16
R45N  –
Tensile Strength 25°C MPa (psi x 103)  –
Fracture Toughness K(I c) mpa m1/2  7.5
Thermal Conductivity 20°C W/m K 19
Coefficient of Thermal Expansion 25-1000°C X 10-6/°C 3.1
Specific Heat 100°C 880 J/kg*K 800
Thermal Shock Resistance   ΔTc  °C –
 Maximum Use Temperature   °C  1400
Dielectric Strength 6.35mm ac-kV/mm (ac V/mil) 15
Dielectric Constant 1 MHz 25°C  –
Dielectric Loss (tan delta) 1 MHz 25°C  –
Volume Resistivity 25°C ohm-cm
                            500°C ohm-cm
                            1000°C ohm-cm
*The chart is intended to illustrate typical properties. Property values vary with method of manufacture, size, and shape of part. Data contained herein is not to be construed as absolute and does not constitute a representation or warranty for which Ortech, Inc. assumes legal responsibility.

Products made from Silicon Nitride (Si3N4)

  • Nozzles
  • Seal Rings, Bearings and Sealing
  • Tubes and Pipes

Standard catalog that you can purchase online