Graphite Degassing Rotor and Impeller for Aluminum Purification
Product Overview
Our graphite degassing rotors and impellers are essential consumable components in rotary degassing units used to remove dissolved hydrogen and solid particulates from molten aluminum and aluminum alloys. Manufactured from high-strength, high-purity graphite, these rotating shafts and impellers inject and disperse fine inert gas bubbles (nitrogen or argon) through the molten metal, floating out hydrogen gas and oxide inclusions. Each rotor is precision-machined to balance at high rotational speeds, ensuring stable operation and long service life in molten aluminum at 700-750°C.
Rotary degassing is the standard process for producing high-quality aluminum castings for automotive, aerospace, and electronics applications. The graphite rotor must resist molten aluminum wetting, thermal shock from immersion, and oxidative wear over hundreds of heats. At Jincheng Graphite, we supply complete degassing rotor assemblies including the shaft, impeller, and optional boron nitride coating, with designs compatible with major degassing units such as Maerz, PyroGenesis, and Aballer systems.
Key Features
- High-purity graphite - minimizes aluminum contamination and rotor erosion
- Precision balanced machining - runs smoothly at 200-600 RPM without vibration
- Excellent thermal shock resistance - withstands sudden immersion into 750°C molten aluminum
- Anti-wetting treatment - optional BN coating reduces aluminum adhesion and extends life
- Custom impeller designs - radial, curved, and cage-style impellers for different bubble dispersion needs
- Various shaft lengths - from 500 mm to 1500 mm to fit any degassing ladle
- Long service life - typically 2-4 weeks in continuous aluminum casting operations
- Threaded or flanged connections - compatible with standard degassing machine mounts
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-strength isostatic graphite |
| Bulk Density | 1.75 - 1.82 g/cm³ |
| Shore Hardness | 60 - 70 HS |
| Flexural Strength | 45 - 55 MPa |
| Service Temperature | 700 - 800°C (molten aluminum) |
| Operating Speed | 200 - 600 RPM |
| Shaft Diameter | 50 mm, 60 mm, 70 mm (custom) |
| Impeller Diameter | 150 - 300 mm (customizable) |
| Shaft Length | 500 - 1500 mm |
| Gas Flow Rate | 1.0 - 3.0 L/min |
| Surface Treatment | Optional BN coating / anti-wetting treatment |
| Dimensional Tolerance | ±0.1 mm |
Applications
- Aluminum die casting - degassing A380, ADC12, and AlSi9Cu3 alloys
- Aluminum extrusion billets - degassing 6063, 6061, and 6082 billet aluminum
- Aerospace aluminum castings - high-strength 7075 and 2024 aerospace alloys
- Automotive wheel casting - degassing A356 wheel castings
- Aluminum foil and sheet - degassing 1xxx and 8xxx series sheet alloys
- Secondary aluminum recycling - refining scrap aluminum ingots
Why Choose Jincheng Graphite?
- Specialized in aluminum foundry consumables - rotors, impellers, and nozzles for the aluminum industry
- BN coating option - extend rotor life by 30-50% with anti-wetting boron nitride coating
- Compatible with major degassing machines - Maerz, PyroGenesis, Aballer, and custom systems
- Consumable stock program - maintain a safety stock of rotors for continuous casting operations
- Custom geometries - we machine impeller designs to your specific bubble dispersion requirements
- Competitive pricing - factory-direct pricing significantly below European rotor brands
- Fast delivery - standard rotors ship within 5-7 business days
- Export packaging - protective packaging for safe international shipping
FAQ
Q: How long does a graphite degassing rotor typically last?
A: Under normal operating conditions in aluminum casting, a graphite rotor lasts approximately 2-4 weeks or 100-300 heats, depending on operating temperature, rotor speed, gas flow rate, and whether the rotor is BN-coated. Coated rotors typically last 30-50% longer.
Q: Do you offer boron nitride coating on the rotors?
A: Yes. We offer a premium BN-coated rotor option that forms a non-wetting barrier against molten aluminum, reducing aluminum buildup on the impeller and shaft. This extends service life and improves gas bubble dispersion efficiency.
Q: Can you make rotors for our specific degassing machine model?
A: Yes. Send us the shaft length, diameter, connection type, and impeller dimensions from your existing rotor, and we will manufacture a compatible replacement. We support both threaded and flanged mounting configurations.
Q: What is the typical lead time for a custom rotor?
A: Standard catalog rotors ship within 5-7 business days. Custom impeller designs or non-standard shaft lengths typically require 15-20 business days for production.
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