Silicon Nitride Degassing Rotors
Silicon Nitride Ceramic Component
SKU: FWM/SN-DGR-001
- Material
- Silicon Nitride (Si₃N₄) – Gas Pressure Sintered (GPS)
- Size
- Custom sizes available
- MOQ
- 5 pieces per type
- Applications
- Aluminum Casting & Foundry
Silicon Nitride Degassing Rotors are core purification components used in aluminum melting and casting processes.
Send drawing, dimensions, rotating speed, operating temperature and quantity for confirmation before 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 Degassing Rotors are core purification components used in aluminum melting and casting processes. By rotating at high speed, they break inert gas (nitrogen or argon) into fine, uniform bubbles, efficiently removing hydrogen and non-metallic inclusions from molten aluminum, thereby improving melt purity, casting density and mechanical properties.
Made from Gas Pressure Sintered (GPS) silicon nitride, these rotors offer excellent corrosion resistance, non-wetting behavior toward molten aluminum, high wear resistance and outstanding thermal shock resistance. They typically last 3–10 times longer than traditional graphite rotors, significantly reducing replacement frequency, downtime and total cost of ownership.
Manufacturing process (source record): High-purity α-Si₃N₄ powder + sintering aids → dry pressing / CIP → green machining → gas pressure sintering under nitrogen → precision finishing → final inspection.
Quality control (source record): Dimensional inspection, surface quality check, dynamic balance verification (if required), density/porosity testing and batch traceability.
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, no secondary contamination, easy cleaning
- Excellent corrosion and erosion resistance in aluminum melt
- High hardness and strength for long-term high-speed rotation with stable geometry
- Outstanding thermal shock resistance (withstands repeated immersion at 700–750 °C)
- Higher and more stable degassing efficiency
- Clean operation, compatible with automated continuous casting lines
- Significantly longer service life than graphite rotors
Typical Applications
- Online aluminum melt degassing systems
- Aluminum alloy melting and holding furnaces
- Continuous casting and high-quality aluminum production lines
- Processes requiring high melt purity and low hydrogen content
Technical Data
| Property | Unit | Typical Value |
|---|---|---|
| Density | g/cm³ | 3.20 – 3.26 |
| Apparent porosity | % | 0 – 0.2 |
| Elastic modulus | GPa | 300 – 320 |
| Compression strength | MPa | > 1500 |
| Vickers hardness (HV0.5) | GPa | 15 – 16 |
| Fracture toughness | MPa·m¹/² | 7.0 – 9.0 |
| Bending strength | MPa | 700 – 900 |
| Linear expansion coefficient | ×10⁻⁶/°C | 3.1 – 3.3 |
| Thermal conductivity | W/(m·K) | 20 – 25 |
| Maximum service temperature in aluminum melt | °C | 700 – 750 (typical) |
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, dimensions, rotating speed, operating temperature and quantity for confirmation before quotation.
- Complete rotor assemblies (rotor head + shaft)
- Custom blade designs and shaft lengths
- Designs optimized for different degassing systems
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. Payment terms, port of shipment and shipping options confirmed in the 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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