Silicon Nitride Tubes
Si3N4 tube is a covalent bond compound with high strength, low density, and high temperature resistance.
Silicon Nitride Tubes (Si3N4 Ceramic Tube) – High-Performance Engineering Material
Material Properties:
Silicon nitride ceramic tubes are inorganic materials that maintain dimensional stability during sintering. These precision-engineered components offer exceptional mechanical characteristics, particularly in hot-pressed form, ranking among the world’s hardest ceramic materials.
Key Advantages:
Exceptional Mechanical Strength
Withstands extreme pressures
Maintains structural integrity under stress
Superior Wear Resistance
Long service life in abrasive environments
Reliable performance in harsh conditions
Excellent Thermal Stability
Maintains properties at elevated temperatures
Suitable for prolonged high-temperature operation
Performance Characteristics:
Extreme hardness for demanding applications
Consistent mechanical properties under load
Outstanding durability in challenging environments
Silicon Nitride Ceramic Tubes Description
| item | Unit | Si3N4 |
| Physical Property | ||
| Color | \ | Gray Black |
| Density | g/cm3 | >3.2 |
| Mechanical properties | ||
| Rockwell hardness | HRA90 | |
| Vickers hardness (Hv50) | HV0.5 | >1550 |
| Elastic modulus (20℃) | Gpa | 290 |
| Bending strength(20℃) | Mpa | >600 |
| Compressive strength (20℃) | Mpa | 2500 |
| Fracture toughness (20℃) | Mpam1/2 | >6.0 |
| Thermal properties | ||
| Thermal conductivity | W/(m·K) | 15-20 |
| Coefficient of thermal expansion（20℃-1000℃） | 10-6K-1 | >3.1 |
| Thermal shock stability | △T℃ | 500 |
| Specific heat capacity | KJ/kg.K | 700 |
| Maximum operating temperature（in air） | ℃ | 1200 |
| Electrical properties | ||
| Dielectric strength (insulation strength) | KV/mm | 1 |
| Volume resistance (20℃) | Ω.cm | 10^12 |
* Tests under room temperature environment;
* The above information is offered for comparison only. Exact properties will vary depending on the manufacturing method.
Silicon Nitride Ceramic Tubes – Industrial Applications
Key Application Areas:
High-Performance Sealing Solutions
Engine seal rings
Turbocharger components
Valve systems
Metal Processing Equipment
Molten metal handling systems
Aluminum and titanium liquid temperature measurement
Welding and forming tools
Specialized Engineering Components
Precision drawing tools
Custom pipe and tube systems
Mechanical engineering applications
Thermocouple Protection Solutions:
Our silicon nitride thermocouple protection tubes offer superior performance in extreme environments:
Exceptional corrosion resistance in incinerators and melting furnaces
High-temperature stability up to 1000°C in oxidizing atmospheres
Non-wetting surface prevents aluminum adhesion
A fully dense structure prevents molten metal infiltration
Performance Advantages for the Aluminum Industry:
6-12+ month service life in aluminum processing
Superior thermal shock resistance
Pore-free construction (vs. reaction-sintered alternatives)
Maintains measurement accuracy in molten metals
Material Comparison:
| Feature | Our Si3N4 Tubes | Conventional Tubes |
|---|---|---|
| Density | 100% dense | Porous structure |
| Al Resistance | Non-wetting | Metal adhesion |
| Service Life | 6-12+ months | Significantly shorter |
Packing
As a ceramic material, silicon nitride is quite fragile in a lot of cases. Our silicon nitride tubes & silicon nitride protect tubes for thermocouples are carefully handled to minimize damage during storage and transportation. Suitable outer boxes and inner cushioning materials are used for Si3N4 products, vacuum packing is also engaged for some of the parts.
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