Silicon Nitride Heater Protection Tubes
Silicon Nitride Ceramic Component
SKU: FWM/SN-HPT-001
- Material
- Silicon Nitride (Si₃N₄) – Gas Pressure Sintered (GPS)
- Size
- Custom sizes available
- MOQ
- 5 pieces per type
- Applications
- Aluminum Casting & Foundry
Silicon nitride heater protection tubes for immersion-heating assemblies in aluminum melting and holding equipment.
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Product Description
Silicon nitride heater protection tubes separate an electric heating element from molten metal while transferring heat into the process.
The ceramic tube surrounds the heater and forms the barrier between the element and the melt. It is a protective component, not a complete heater or a thermocouple sensing tube.
Thermal shock resistance helps the tube tolerate temperature changes, while strength and resistance to molten-aluminum attack support the immersed structure. Low wetting by aluminum helps reduce buildup on the outside surface.
Product Features
- Ceramic barrier between the heater and molten aluminum
- Thermal shock resistance during temperature changes
- Strength for the immersed tube structure
- Low wetting by aluminum to help reduce surface buildup
- Heat transfer through the tube wall into the melt
Typical Applications
- Immersion-heating assemblies in aluminum holding furnaces
- Heater protection in aluminum melting equipment
- Temperature maintenance in aluminum processing systems
95% Si₃N₄ Typical Properties
| Property | 95% Si₃N₄ | Condition / method |
|---|---|---|
| Density (g/cm³) | ≥3.2 | — |
| Young’s modulus (GPa) | 300 | — |
| Fracture toughness (MPa·m½) | 6.2 | — |
| Flexural strength (MPa) | >720 | 25°C |
| Compressive strength (MPa) | 2200 | 25°C |
| Thermal conductivity (W/(m·K)) | 15–20 | 25°C |
| Coefficient of thermal expansion (10⁻⁶/K) | 3.0–3.2 | 25–1000°C |
| Volume resistivity (Ω·cm) | >10¹⁴ | 25°C |
| Typical maximum material temperature (°C) | 1200 | — |
| Poisson’s ratio | 0.26 | — |
| Dielectric strength (kV/mm) | 16 | — |
| Relative permittivity | 8.2 | 1 MHz; 25°C |
| Dielectric loss tangent | 0.004 | 1 GHz; 25°C |
Available Forms
Representative forms are shown for selection. Send drawing, dimensions, operating temperature, medium and quantity for material grade and dimensional confirmation before quotation.
- Straight tubes, flanged tubes, closed-end tubes
- Custom lengths, diameters and wall thicknesses
- Designs compatible with various heating element types
Packaging & Shipping
Packing and shipment arrangements are selected for the confirmed component geometry and order requirements.
| Item | Details |
|---|---|
| Packaging & shipping | Individually protected, cushioned and packed in export cartons or wooden cases according to size, quantity and transport requirements. Port of shipment confirmed in the quotation. |
| Payment terms | T/T / Western Union / PayPal; 50% advance payment, 50% balance before shipment |
| Shipping methods | Sea freight / Air freight / Door-to-door courier |
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