High-speed, high-precision bearings are the quality assurance of precision machining. Silicon nitride bearings are recognized as the most preferred material for high-end precision bearings due to their high hardness, high strength, high toughness, low thermal expansion rate, and self-lubricating properties.

It is widely used in automotive bearings, wind power insulating bearings, the petrochemical industry, precision machine tool high-speed bearings, and other fields. It is capable of handling various complex and harsh working conditions such as highly corrosive and high temperatures.

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

*Tested at room temperature

*The above information is for comparison only. The exact characteristics will vary depending on the manufacturing method.

Typical properties of silicon nitride ceramics

-High strength over a wide temperature range

-High fracture toughness

-High hardness

-Excellent wear resistance

-Low thermal expansion and high thermal conductivity

-Good thermal shock resistance

-Good chemical and oxidation resistance

Application of Si3N4 bearing

-precision machine tool high-speed bearings

-Automobile industry

-Industrial machinery

-Aerospace industry

-Motors and generators

-Medical equipment

-Chemical treatment

Packing

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