Silicon Nitride Riser Tubes / 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.
Send drawing, length, diameters, flange dimensions and quantity for quotation.
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Product Description
Review representative product forms and application context below. Final geometry and acceptance criteria are confirmed from the drawing and operating conditions.
Silicon Nitride Riser Tubes (Stalks) are critical components used in low-pressure die casting of aluminum and other non-ferrous metals.
Compared with traditional cast iron riser tubes, GPS silicon nitride tubes offer low thermal conductivity for better heat preservation of the molten aluminum, high mechanical strength at elevated temperatures, excellent thermal shock resistance, and non-wetting behavior toward molten aluminum. This significantly reduces aluminum adhesion, air leakage risk, and maintenance frequency, while improving casting quality and process stability.
Manufacturing process (source record): High-purity Si₃N₄ powder → forming → gas pressure sintering → precision machining → final inspection.
Quality control (source record): Dimensional inspection, surface quality, density/porosity and sealing surface check.
Data status: the source record is not supplier-verified. Numerical values are typical engineering references, not guaranteed product specifications; final values require grade, drawing and test-basis confirmation.
Product Features
- Non-wetting to molten aluminum — no adhesion, easy cleaning, reduced aluminum loss
- Low thermal conductivity for superior heat preservation
- High mechanical strength retained at elevated temperatures
- Excellent thermal shock resistance for repeated cycles
- Low risk of air leakage and structural damage
- Long service life and lower total maintenance cost
Typical Applications
- Low-pressure die casting of aluminum alloys
- Molten aluminum transfer and filling systems
- Holding furnaces and casting machines
Technical Data
| Property | Unit | Typical Value |
|---|---|---|
| Density | g/cm³ | 3.15 – 3.26 |
| Apparent porosity | % | 0 – 0.2 |
| Young’s Modulus | GPa | 300 – 320 |
| Flexural Strength | MPa | ≥ 700 – 900 |
| Fracture Toughness | MPa·m¹/² | 6 – 9 |
| Vickers Hardness / HRA | GPa / HRA | 15 – 16 GPa / 92 – 94 |
| Thermal Expansion Coefficient | ×10⁻⁶/°C | 2.95 – 3.3 |
| Thermal Conductivity | W/(m·K) | 20 – 27 |
| Max. Operating Temperature | °C | 1200 – 1400 |
Typical reference values for material selection only. Final specifications are confirmed against drawing, grade and operating conditions. Values are typical reference data and may vary with grade, geometry and test method. Final specifications confirmed against drawing and operating conditions.
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. Terms confirmed in quotation. |
About FreeWill Material
FreeWill Material supplies technical ceramic components for demanding industrial applications. Our product range includes silicon carbide, silicon nitride, alumina, zirconia and other engineered ceramic materials.
We work with qualified manufacturing resources in China to support material selection, drawing-based customization, production coordination, inspection documentation and export delivery. Component feasibility, tolerances and material grades are reviewed according to the customer's drawings and operating conditions.
Our focus is to provide international buyers with clear technical communication, practical sourcing support and responsive quotation service for custom ceramic components.
- Drawing-Based Customization
- Material Selection Support
- Inspection Documentation
- Export Coordination
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