Description of Silicon Nitride Protective Tubes for Thermocouples
Silicon nitride (Si3N4) is used in the metallurgical industry because it maintains consistent performance at elevated temperatures. Its microstructure provides stability during temperature fluctuations. Measurements confirm its creep resistance and oxidation resistance. Its low thermal conductivity and wear resistance render it suitable for many industrial applications.
Silicon nitride protective tubes for thermocouples demonstrate corrosion resistance and high temperature resistance. They are applicable in waste incineration facilities and melting furnaces operating at elevated temperatures.
There are 5 production methods for fabricating silicon nitride, including SRBSN, GPSN, HPSN, HIP-SN and RBSN. Consequently, the applications and the working material differ. Among these methods, GPSN is used in the majority of cases for producing Si3N4 components.
Silicon Nitride Protective Tubes for Thermocouples
Specifications
GPSN
Property
|
Unit
|
|
Colour
|
|
Grey
|
Mechanical Properties
|
|
|
Density
|
g/cm³
|
3.21
|
Compressive Strength
|
MPa
|
3 000
|
Flexural Strength
|
MPa
|
800
|
Weibull Modulus m
|
|
15
|
Fracture Toughness KIc
|
MPa m^1/2
|
6.5
|
Elastic Modulus E
|
GPa
|
320
|
Poisson's Ratio
|
|
0.28
|
Vickers Hardness (HV 1)
|
GPa
|
16
|
Thermal Properties
|
Maximum Temperature
|
Inert Gas
|
°C
|
1 200
|
Air
|
°C
|
1 100
|
Thermal Conductivity
|
|
25
|
at 20°C
|
W/mK
|
28
|
at 1000°C
|
W/mK
|
16
|
Thermal Expansion
|
20-100°C
|
10-6/K
|
2
|
20-1000°C
|
10-6/K
|
3.5
|
Thermal Shock Parameter R1
|
K
|
600
|
Thermal Shock Parameter R2
|
W/mm
|
15
|
Electrical Properties
|
Specific Resistivity at 20°C
|
Ωcm
|
10^12
|
Specific Resistivity at 800°C
|
Ωcm
|
10^7
|
Dielectric Constant
|
1 MHz
|
6
|
Silicon Nitride Protective Tubes for
Thermocouple Applications
Products produced from silicon nitride include, among others:
- Ceramic tubes
- Bearing rollers
- Ceramic cutting tools
- Cyrol bearing rollers
- Nozzles
- Sealing rings
- Tube forming tools
- Special applications in mechanical engineering
Silicon Nitride-Protect Tube Packaging
During storage and transport the silicon nitride protective tube is managed in accordance with established protocols to preserve its quality in the original condition.