Silicon nitride is mainly composed of Si3N4 and has excellent thermal shock resistance and high-temperature strength. These properties make it an ideal material in automotive engines and gas turbines. It is used in turbocharger rotors, heating plugs, and hot plugs in diesel engine components, and many other different applications.

Silicon nitride Performance

Item

Unit

Si3N4

Type

Gas pressure sintered

Density

g/cm3

3.2-3.3

Color

Black, Grey

Young Modulus

GPa

300~320

Vickers Hardness

GPa

15 – 17

Compressive Strength

MPa

2200

Bending Strength

MPa

600-1000

Thermal Conductivity

W/m.K

20-30

Thermal Expansion

10-6/°C

3.2

Max. Working Temp.

°C

1200

Volume Resistivity

Ω ·cm

> 1014

Dielectric Constant

6

Dielectric Strength

kV/mm

12

Fracture toughness

MPa·m1/2

5.0-7.0

Advantage

Silicon nitride has high strength and fracture toughness at high temperatures.

Silicon nitride has a small thermal expansion coefficient and extremely high thermal shock resistance.

Application

It is used as a high-temperature structural member in automotive engines, gas turbines, and combustion chamber components.

Packing

Silicon nitride diesel engine components use appropriate outer boxes and internal buffer materials, and some components are also vacuum-packed.