Silicon nitride (Si3N4) has an exceptional set of properties:

  • high hardness;
  • high corrosion resistance;
  • low density;
  • stability in a wide range of temperatures;
  • precision machining capability.


All these combinations make the material irreplaceable in the production of corrosion-resistant, wear-resistant and heat-resistant products for a variety of industries.


The main applications are:

  • bearings for pumps and compressors;
  • ceramic plungers;
  • balls for ball bearings;
  • grinding bodies;
  • elements of valves and stop valves;
  • lining for protection from wear and corrosion;
  • sorting wheels of various grinding machinery;
  • shafts of extruders (screws), nozzles of extruders (cores);
  • covers and tubes of thermocouples, rods;
  • nozzles;
  • burners;
  • products for the paper and printing industry;
  • furniture and lining of furnaces;
  • substrates, plates;
  • products for the metallurgical industry.

Basic properties of the material


Properties Brand of material
Composition Si3N4
Density, g/sm3 3,2-3,3
Isolated porosity, % 0
Hardness, GPa 13,5-14,0
Bending strength, MPa 280-310
Compressive strength, MPa 3700-3900
Thermal conductivity at 20-100°С, W/mK 20-30
Coefficient of linear thermal expansion at 20-1000°С, 10-6К-1 2,6-3,3
Maximum operating temperature °С

Oxidative environment

Reducing or inert environment





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