Graphite boxes, also known as graphite saggars or graphite containers, are critical consumable components used in the production of lithium-ion battery anode materials. During carbonization and graphitization processes, graphite boxes provide a stable high-temperature environment and ensure uniform heat distribution throughout the furnace.
With the rapid growth of electric vehicles (EVs), energy storage systems (ESS), and consumer electronics, the demand for artificial graphite anode materials has increased significantly. High-density isostatic graphite boxes have become indispensable components in graphitization furnaces worldwide.
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Graphite Box Structure and Machining Details
Typical Production Process of Anode Materials
Petroleum Coke ↓ Calcination ↓ Carbonization ↓ Graphitization Furnace ↓ Crushing ↓ Spheronization ↓ Purification ↓ Surface Coating ↓ Anode Material ↓ Lithium-ion Battery
Graphite boxes are mainly used during the carbonization and graphitization stages, where temperatures can exceed 2800°C under inert atmosphere.
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Graphitization Furnace Loading with Graphite Boxes
Main Advantages of Graphite Boxes
Excellent High Temperature Resistance
Graphite boxes can withstand temperatures up to 3000°C under inert atmosphere without deformation.
Benefits
Stable operation
Long service life
Reduced replacement frequency
Superior Thermal Conductivity
Compared with ceramic containers, graphite provides significantly higher thermal conductivity, resulting in better temperature uniformity and shorter graphitization cycles.
Benefits
Improved graphitization efficiency
Reduced energy consumption
Better product consistency
Outstanding Thermal Shock Resistance
Repeated heating and cooling cycles can easily crack ceramic containers. Isostatic graphite exhibits superior thermal shock resistance and structural stability.
Benefits
Lower maintenance cost
Higher productivity
Longer service life
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High Density Isostatic Graphite Saggar
Technical Data Sheet
| Property | Unit | Typical Value |
|---|---|---|
| Material Grade | - | High Purity Isostatic Graphite |
| Carbon Content | % | ≥99.99 |
| Bulk Density | g/cm³ | 1.80-1.90 |
| Grain Size | μm | 5-15 |
| Ash Content | ppm | ≤50 |
| Flexural Strength | MPa | 40-70 |
| Compressive Strength | MPa | 80-150 |
| Thermal Conductivity | W/m·K | 100-140 |
| Electrical Resistivity | μΩ·m | 8-15 |
| CTE (20-600°C) | ×10⁻⁶/K | 3.5-5.5 |
| Maximum Temperature (Vacuum) | °C | 2500 |
| Maximum Temperature (Inert Atmosphere) | °C | 3000 |
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Technical Drawing of Graphite Saggar
Graphite Box VS Ceramic Saggar
| Item | Graphite Box | Ceramic Saggar |
|---|---|---|
| Maximum Temperature | 3000°C | 1600-1800°C |
| Thermal Conductivity | Excellent | Moderate |
| Thermal Shock Resistance | Excellent | Fair |
| Weight | Light | Heavy |
| Machinability | Excellent | Limited |
| Service Life | Long | Medium |
| Heating Efficiency | Excellent | Moderate |
| Replacement Frequency | Low | High |
| Cost Performance | Excellent | Good |
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Graphite Saggar VS Ceramic Saggar Comparison
Applications
Lithium-ion Battery Industry
Artificial Graphite Anode Materials
Natural Graphite Anode Materials
Silicon-Carbon Composite Materials
Sodium-ion Battery Industry
Hard Carbon Materials
Soft Carbon Materials
Carbon Material Industry
Carbonization Process
Graphitization Process
High Temperature Furnace Industry
Graphitization Furnace
Carbonization Furnace
Vacuum Furnace
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Lithium Battery Anode Material Production Line
Conclusion
High-purity isostatic graphite boxes have become essential components in modern lithium battery anode material production. Their superior thermal conductivity, excellent thermal shock resistance, high mechanical strength, and long service life make them the preferred solution for graphitization furnaces worldwide.
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