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High Precise Silicon nitride parts Silicon Nitride (Si3N4) ceramic fork

Typical properties of silicon nitride ceramics
High strength over a wide temperature range
High fracture toughness
High hardness
Outstanding wear resistance
Low thermal expansion and high thermal conductivity
Good thermal shock resistance
Good resistance to chemical and oxidation
  • 0308

Silicon Nitride (Si3N4) is an advanced ceramic material with a high melting point, very high hardness and chemical inertness, and excellent thermal shock resistance. It is often used to manufacture mechanical components such as bearings, gas turbine blades, mechanical sealing rings and permanent moulds.

Silicon Nitride (Si3N4) is widely recognized for its exceptional mechanical, thermal, and electrical properties, making it a top choice for advanced ceramic applications. With its remarkable hardness and outstanding thermal shock and impact resistance, Silicon Nitride outperforms many metals in high-temperature environments. Its unique combination of creep and oxidation resistance, coupled with low thermal conductivity and high wear resistance, positions it as a superior material for demanding industrial settings. When faced with extreme conditions requiring high-temperature and high-load capabilities, Silicon Nitride stands out as a reliable and durable option for a wide range of industrial applications.

Material Advantages

  • High strength over a large temperature range

  • High fracture toughness

  • Good flexural strength

  • Mechanical fatigue and creep resistant

  • Lightweight – Low density

  • High hardness and wear resistance, both impingement and frictional modes

  • Superior thermal shock resistance

  • Low thermal expansion

  • Electrical insulator

  • Good oxidation resistance

  • Good chemical corrosion resistance

  • Wear-resistant

  • High stiffness


  • Rotating ball bearings and rollers bearings

  • Cutting tools

  • Engine components: valves, rocker arm pads, seal faces

  • Induction heating coil supports

  • Turbine blades, vanes, buckets

  • Welding and brazing jigs

  • Heating element components

  • Crucibles

  • Metal tube forming rolls and dies

  • TIG / Plasma welding nozzles

  • Weld positioners

  • Precision shafts and axles in high-wear environments

  • Thermocouple sheaths and tubes

  • Semiconductor process equipment

Properties Of Silicon Nitride

Property Item Data Unit



Color Black/Grey -
Density 3.2 g/cm3
Bending Strength 750 MPa
Compressive Strength 3800 MPa
Elastic Modulus 290 GPa
Fracture Toughness 7 MPa m1/2
Weber Coefficient 15 m
Vickers Hardness 1700 HV 0.5



Coefficient of Line

Thermal Expansion

2 10-6 K-1
Thermal Conductivity 20 W/mK
Thermal Shock Resistance (Put in Water) 750 ΔT℃
Max Working Temperature 1300



Volume Resistance at 20℃ >10 Ωcm
Dielectric Strength 10×106 V/m
Dielectric Constant - εr

One MHZ Dielectric

Loss Angle at 20℃

- tanδ



Nitric Acid(60%)90℃ 1 WT Loss mg/cm2/day
Sulphuric Acid(95%)95℃ ≒0.00
Caustic Soda(30%)80℃ 0.2

This data is the result of laboratory testing. Customers need to judge whether it can be used according to the specific environment.

For more customization details, Please contact us.

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Founded in June 2006, Shenzhen Haorui IndustriaI Technology Co.,Ltd. is a professional enterprise engaged in R&D, manufacturing and sales of non-standard industrial ceramics, hard alloys (tungsten steel) and various metal and non-metal precision machinery parts.

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