Silicon Nitride

High-purity silicon nitride ceramic components for custom jigs

Silicon Nitride — Si3N4
Silicon nitrides have a unique grain structure which delivers both high strength, toughness and very good thermal shock resistance — making it ideal for applications with high dynamic stresses, thermal stress, and high reliability requirements. This unique combination of material properties provides advantages in severe-service applications such as turbines and high-end ball bearings.

Primary Features

  • Wear resistance
  • Corrosion resistance
  • High mechanical strength and toughness
  • Electrically insulating
  • Thermal shock resistance


  • Wear-resistance components
  • Semiconductor manufacturing equipment components
  • High-temperature components

Seal ring made from silicon nitride for fluid handling applicationsSilicon nitride seal face for use in oil & gas and petrochemical applicationsSilicon nitride custom component


  • KMT-SiN — Si3N4 (black)

Material Properties for KemaTek™ Silicon Nitride


Properties Units Test Silicon Nitride — Si3N4
Material Name KMT-SiN
Color Black
Primary Material Content
Characteristics Lightweight, high wear resistance, and high heat resistance
Applications Heat, wear, and corrosion-resistant components
Bulk Density g/cc ASTM-C20 3.20
Water Absorption % ASTM-C373 0
Vickers Hardness (Load 500 g) GPa ASTM-C1327-03 13.9
Flexural Strength MPa ASTM-C1161-02c 610
Compressive Strength MPa ASTM-C773 3850
Young’s Modulus of Elasticity GPa ASTM-C1198-01 290
Poisson’s Ratio ASTM-C1198-01 0.28
Fracture Toughness MPa * m12 ASTM-C1421-01b (Kevron notched beam) 5
Coefficient of Linear Thermal Expansion, 40-400 ℃ x 10-6/℃ ASTM-C372-94 2.6
Thermal Conductivity, 20℃ W/(m • K) ASTM-C408-88 23
Specific Heat J/(Kg • K) x 103 ASTM-E1269 0.66
Thermal Shock Resistance Note 1 550
Volume Resistivity, 20℃ Ω • cm ASTM-D257-99 ≥1024
Dielectric Strength KV/mm ASTM-D149-97 13
Dielectric Constant, 1 MHz ASTM-D150-98 (1 MHz)
Loss Tangent (x 10-4 ASTM-D150-98 (1 MHz)
Nitric Acid 60% 90℃ WT Loss (mg/cm2/day) < 1.0
Sulphuric Acid 95%, 95℃ WT Loss (mg/cm2/day) < 0.40
Caustic Soda 30%, 95℃ WT Loss (mg/cm2/day) < 0.36

Technical ceramics material properties chart
Ceramic Materials Properties Chart — All Materials — PDF, 128K

For more information or to get a quote on your next refurbishment project, please contact us.