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High precision of Silicon nitride ceramic round tube

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
  • 0304

Silicon nitride ceramic round tube

Silicon Nitride (Si3N4) combines the best electrical, thermal, and mechanical properties of any ceramic material. It is the best solution for applications where other ceramic materials prove to be too weak to handle mechanical stress or thermal shocks.With its excellent combination of properties, Silicon Nitride is highly sought after in industries requiring high-performance materials that can withstand extreme conditions. Its superior strength, toughness, and thermal shock resistance make it an ideal choice for applications such as cutting tools, bearings, and turbine engine components. Additionally, its electrical insulating properties make it suitable for use in high-temperature and high-voltage applications. When it comes to demanding environments, Silicon Nitride stands out as a reliable and durable material that exceeds

Silicon Nitride’s Key Applications

Silicon nitride can readily be deployed in some of the world’s toughest working environments, owing to its unique intersection of chemical and thermodynamic properties. Hot pressed silicon nitride offers excellent high-temperature performance and is ideal for seal face components challenging conditions, including boiler water reactor pumps, pressurized water reactor pumps, corrosive borated water service, and within rotating bearings.

Pump components comprised of silicon nitride are also used in the oil and gas sector, and throughout the petrochemical industry at large. The chemical integrity of Si3N4 makes it suitable for surfaces within pumps (impellers, shafts, seals, etc.) that routinely come into contact with abrasive slurries and corrosive fluids.

Properties Of Silicon Nitride




Bending Strength750MPa
Compressive Strength3800MPa
Elastic Modulus290GPa
Fracture Toughness7MPa m1/2
Weber Coefficient15m
Vickers Hardness1700HV 0.5



Coefficient of Line

Thermal Expansion

210-6 K-1
Thermal Conductivity20W/mK
Thermal Shock Resistance (Put in Water)750ΔT℃
Max Working Temperature1300



Volume Resistance at 20℃>10Ωcm
Dielectric Strength10×106V/m
Dielectric Constant-εr

One MHZ Dielectric

Loss Angle at 20℃




Nitric Acid(60%)90℃1WT 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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