Silicon nitride ceramics have high-temperature resistance, high strength, and excellent corrosion resistance, and have been widely used as structural materials in various fields. 

As a protection tube material, silicon nitride tube can be applied to high-temperature measurements around 1200℃, overcoming the shortcomings of the traditional high alumina, corundum protection tube.

Overcome the traditional high alumina, corundum protection tube high-temperature deformation, slagging, and other shortcomings, greatly improving the service life of the protection tube.

Si3N4 thermocouple protection tube has excellent corrosion resistance and high-temperature strength and can be used in waste incinerators and melting furnaces with higher operating 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

Silicon Nitride Tube Applications

Silicon Nitride Ring

In industry, high temperature and thermal shock, acid and alkali corrosion, molten metal corrosion, strong oxidizing or reducing atmosphere and other harsh environments.

– Protect Tubes for Thermocouples Silicon Nitride

– Silicon Nitride Ceramic Protection Tubes

– Tube forming tools

– Mechanical engineering special applications

– Silicon nitride ceramic bushing

Packing

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