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Silicon Nitride (Si3N4) – Custom Machined Parts

Silicon Nitride has the best combination of mechanical, thermal and electrical properties of any technical ceramic material. It is a high performance technical ceramic with high strength, toughness and hardness, and is extremely resistant to thermal shock and impact. It is also an electrically insulating ceramic material. Typically, it is used in applications where high load-bearing capacity, thermal stability and wear resistance are required.

Sialon (Silicon Aluminium Oxynitride) is a silicon nitride ceramic with a small percentage of aluminum oxide added. It is a nonporous engineering material with superior thermal and mechanical properties compared with silicon nitride. Sialon is an ideal material for applications where strength at high temperature, thermal shock resistance, and corrosion resistance are needed.

Silicon Nitride Properties

Vickers Hardness
Flexural Strength
Fracture Toughness
Coefficient of Thermal Expansion
Thermal Conductivity
Thermal Shock Resistance(△T) Dielectric Strength(kv/mm) Wear Resistance
Chemical Resistance
Chemical Formula
Silicon Nitride
16 750 6 2.8 25 650 730 0.6
(Blast Abrasion Loss)
Very Good
Sialon(Si₃N₄+Al₂O₃) 12.7 690 6 1.6 21 700 - - -

For more information, see Material Guide

Silicon Nitride – Key Properties & Popular Applications

Key Properties Applications
High Strength Silicon Nitride’s high flexural strength and excellent fracture toughness make it extremely resistant to cracking, breaking and bending, and give ability to operate under extreme conditions. ■Parts subject to high stress such as automotive components and bearings.
High Thermal Stability
■High temperature strength
■Low thermal expansion
■High thermal shock resistance
Silicon Nitride retains its strength at very high temperatures.
Additionally, its low thermal expansion coefficient provides outstanding thermal shock resistance, enabling this material to withstand rapid heating and cooling without cracking.
■Parts subject to rapid and extreme temperature changes
■Parts requiring high-temperature and high-load abilities
■Crucibles for handling molten aluminum
High Wear Resistance Silicon Nitride’s high hardness and fracture toughness provide excellent wear resistance. ■Parts requiring low friction
■Fixtures for positioning and transferring metal parts during induction heating (hardening)

Available Sizes and Machining Capability

Availability Sizes(mm) Machining Capability Sizes(mm)
Plate Φ300×t20 Hole diameter Φ0.1 or more
Rod Φ50×300 Hole depth 20D(~Φ1.5)、200(Φ1.5~)
Groove width 0.2 or more Max. hole number 100
Max. Groove(pocket) depth 30 Thread size M2 or more

Ceramics List

  • Alumina(Al₂O₃)

    Excellent electrical insulation properties , High temperature resistance , Plasma resistance , High hardness , Wear resistance

  • Aluminum nitride(AlN)

    High thermal conductivity , High temperature resistance , Low thermal expansion , Excellent electrical insulation properties , Plasma resistant , Corrosion resistant

  • Zirconia(ZrO2)

    High fracture toughness , Low thermal conductivity , Wear resistant

  • Silicon carbide(SiC)

    High hardness , High thermal conductivity , High mechanical strength , Corrosion resistant

  • Silicon Nitride (Si3N4)

    High fracture toughness , Low thermal expansion , Wear resistant , Good thermal shock resistance

  • Machinable Ceramics

    Excellent electrical insulation properties , High machinability , High temperature resistance

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