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.