Graphite Rotor Impeller for Aluminum Rotary Degassing
Product Overview
Our graphite rotor impellers for rotary degassing are precision-machined components installed in aluminum melting and holding furnaces to inject and disperse inert gas (nitrogen or argon) into molten aluminum. As the rotor spins at 200-600 RPM, the impeller breaks the purging gas into fine bubbles that rise through the melt, removing dissolved hydrogen and solid inclusion particles. These degassing rotors are consumable components in aluminum casting plants, die foundries, and aluminum alloy recycling operations, and we supply both standard and custom impeller designs for major degassing equipment brands.
Effective rotary degassing is critical for producing high-quality aluminum castings, as dissolved hydrogen causes porosity and inclusions reduce mechanical properties. At Jincheng Graphite, we manufacture graphite degassing rotors from high-purity, high-density isostatic graphite that resists molten aluminum wetting and thermal shock. We supply complete rotor assemblies including the shaft and impeller, as well as replacement impellers for existing degassing units. Our rotors are compatible with standard rotary degassing machines used in die casting, sand casting, and continuous aluminum casting operations worldwide.
Key Features
- High-density graphite - resists molten aluminum wetting and reduces erosion
- Precision impeller vanes - machined for fine bubble dispersion and effective degassing
- Thermal shock resistant - withstands sudden immersion into 700-750°C aluminum melt
- Complete rotor assemblies - shaft + impeller as one ready-to-install unit
- Standard and custom designs - compatible with major degassing machine brands
- Consistent bubble distribution - designed for uniform hydrogen removal across the melt
- Long service life - high-density graphite extends rotor life vs. standard grades
- Competitive cost - factory-direct pricing vs. OEM degassing rotor replacements
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-density isostatic graphite |
| Bulk Density | 1.80 - 1.88 g/cm³ |
| Shore Hardness | 65 - 75 HS |
| Flexural Strength | 55 - 65 MPa |
| Melt Temperature Range | 700 - 800°C (aluminum and aluminum alloys) |
| Operating Speed | 200 - 600 RPM |
| Shaft Diameter | 30 mm, 40 mm, 50 mm (custom) |
| Impeller Diameter | 100 mm, 120 mm, 150 mm, 200 mm (custom) |
| Shaft Length | 500 - 1500 mm (custom per furnace depth) |
| Gas Bore Diameter | 6 - 10 mm (through shaft center) |
| Vane Design | 4-vane, 6-vane, or radial disperser type |
| Service Life | 15 - 30 days (depending on melt and operating conditions) |
Applications
- Die casting - degassing aluminum die casting alloys before casting
- Sand casting - hydrogen removal in aluminum sand casting foundries
- Aluminum recycling - purifying recycled aluminum melts before ingot casting
- Continuous casting - in-line degassing for aluminum rod and sheet casting
- Aluminum alloy wheels - degassing A356 and wheel casting alloys
- Lithium battery foil - high-purity degassing for aluminum battery foil production
Why Choose Jincheng Graphite?
- Degassing rotor expertise - deep experience with aluminum foundry degassing applications
- High-density material - our graphite resists aluminum wetting better than standard grades
- Direct replacement - our rotors fit most standard degassing machine mounts
- Custom lengths - shaft length tailored to your furnace depth
- Bulk supply program - reliable monthly supply for foundry consumable management
- Cost savings - 30-50% lower cost vs. imported OEM degassing rotors
- Fast delivery - standard rotor assemblies ship within 7-10 days
- Technical support - we help optimize rotor speed and gas flow for your alloy
FAQ
Q: How long does a graphite degassing rotor last?
A: Under normal operating conditions (700-750°C aluminum, 300-500 RPM), a high-density graphite rotor typically lasts 15-30 days. Rotor life depends on melt temperature, rotor immersion depth, gas purity, and how often the rotor is immersed and withdrawn. We recommend monitoring impeller diameter as it erodes.
Q: Are your rotors compatible with our existing degassing machine?
A: Our rotors are designed to match standard rotary degassing machine shaft couplings. Please provide your machine brand, shaft coupling type, and required shaft length, and we will confirm compatibility. We can also custom-machine the top coupling to match your specific machine.
Q: What gas should be used with the degassing rotor?
A: High-purity nitrogen (99.999%) or argon is recommended. Nitrogen is more economical for most aluminum casting applications; argon is preferred for high-purity alloys and when nitrogen solubility is a concern. Gas flow rate is typically 1-3 L/min depending on melt volume.
Q: Can you supply just the impeller, or must I buy the complete rotor?
A: We supply both complete rotor assemblies (shaft + impeller) and replacement impellers only. If your shaft is still in good condition, you can replace just the impeller, which is the part that experiences the most erosion.
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