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Grade: Reaction Bonded
Composition: Si₃N₄
Form: Tube
Material: Silicon Nitride
Commodity: Ceramics
Inside Diameter:
5mm
Reaction Bonded Silicon Nitride (Si₃N₄) Tube combines low density, high fracture toughness, and strong resistance to both wear and oxidation, making it a leading material for high-performance tubular components. Its stability in corrosive or high-temperature atmospheres ensures use in furnaces, molten metal handling, and advanced thermal systems. Industries such as aerospace, automotive, and chemical processing employ Si₃N₄ tubes in heat exchangers, thermocouple protection sheaths, and fluid transport systems exposed to harsh conditions. Research applications include high-temperature gas flow studies, thermal cycling tests, and evaluation of advanced ceramic-matrix composites. The tubular form maximizes surface-to-volume efficiency while providing robust thermal shock resistance. With superior reliability over metals, Si₃N₄ tubes play a crucial role in advancing energy, aerospace, and materials engineering technologies.
Tolerances
Tube
| Outside Diameter | =<2mm | ±10% |
|---|---|---|
| Outside Diameter | =<5mm | ±10% |
| Outside Diameter | >5mm | ±10% |
| Wall Thickness | ±20% |
Material Properties for Ceramics
Chemical Resistance
| Element | Value |
|---|---|
| Acids - concentrated | Fair |
| Acids - dilute | Good |
| Alkalis | Fair |
| Halogens | Good |
| Metals | Fair |
Electrical Properties
| Element | Value |
|---|---|
| Dielectric constant | 10 |
| Volume resistivity( Ohmcm ) | >10⁷@25 |
Physical Properties
| Element | Value |
|---|---|
| Apparent porosity( % ) | 15-23 |
| Density( gcm⁻³ ) | 2.4 |
Thermal Properties
| Element | Value |
|---|---|
| Upper continuous use temperature( C ) | 1200-1500 |
| Specific heat( J K⁻¹ kg⁻¹ ) | 690@25°C |
| Thermal conductivity( W m⁻¹ K⁻¹ ) | 10-16@20°C |
| Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) | 3.3@20-1000°C |
Mechanical Properties
| Element | Value |
|---|---|
| Tensile modulus( GPa ) | 170-220 |
| Hardness - Vickers( kgf mm⁻² ) | 800-1000 |
| Shear strength( MPa ) | 190-240 |
| Tensile strength( MPa ) | 160 |
Pultrusions
| Element | Value |
|---|---|
| Compressive strength( MPa ) | 550-650 |
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Reaction Bonded Silicon Nitride Rod (Si₃N₄) Reaction bonded silicon nitride (Si₃N₄) rod; high strength, wear resistance, and thermal stability with low density and oxidation/corrosion resistance. Used for turbine parts, rolling elements, and structural supports in high‑temperature environments.each
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