Silicon Nitride Riser Tubes and Stalks
Silicon Nitride Ceramic Component
SKU: FWM/SN-RISER-001
- Material
- Silicon Nitride (Si₃N₄) – Gas Pressure Sintered (GPS)
- Size
- Custom sizes available (standard lengths and diameters available)
- MOQ
- 5 pieces per type
- Applications
- Aluminum Casting & Foundry
Silicon Nitride Riser Tubes (Stalks) are critical components used in low-pressure die casting of aluminum and other non-ferrous metals.
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Product Description
Silicon nitride riser tubes carry molten aluminum from a holding furnace toward the die in low-pressure casting.
The open bore forms the metal-transfer passage as furnace pressure drives the melt upward. The flange and sealing interfaces connect the stalk to the casting machine; this function differs from a closed-end heater or thermocouple protection tube.
Silicon nitride combines strength and thermal shock resistance with low wetting by molten aluminum. These properties help the tube withstand repeated casting cycles and limit aluminum buildup.
Product Features
- Low wetting by aluminum to help limit metal buildup
- Thermal shock resistance through casting cycles
- Mechanical strength for the metal-transfer passage
- Resistance to attack by compatible molten aluminum alloys
- Open-bore and flange geometry matched to the casting machine
Typical Applications
- Low-pressure die casting of aluminum alloys
- Molten-aluminum transfer from holding furnace to die
- Stalk replacements in aluminum casting machines
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, length, diameters, flange dimensions and quantity for quotation.
- Riser tubes with flanges
- various flange designs and sealing configurations.
Packaging & Shipping
Packing and shipment arrangements are selected for the confirmed component geometry and order requirements.
| Item | Details |
|---|---|
| Packaging & shipping | Individually protected and packed in export cartons or wooden cases. Other commercial terms are 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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