Product Overview
High-purity graphite crucibles designed specifically for melting rare earth metals, rare earth alloys, and reactive metals. Our rare earth melting crucibles are manufactured from high-density isostatic graphite with exceptional corrosion resistance to molten rare earth metals, providing long service life and clean melting results. The crucibles are precision machined with thick walls for durability in high-temperature melting applications.
Key Features
- High purity isostatic graphite for minimal contamination
- Excellent corrosion resistance to rare earth metals
- High temperature resistance up to 1600°C and above
- Thick wall design for extended service life
- Good thermal shock resistance
- Custom sizes and geometries available
- Suitable for vacuum and inert atmosphere melting
Technical Specifications
| Parameter | Unit | Value |
|---|---|---|
| Material | - | High Purity Isostatic Graphite |
| Bulk Density | g/cm³ | 1.80 - 1.88 |
| Shore Hardness | - | 70 - 80 |
| Flexural Strength | MPa | 45 - 55 |
| Compressive Strength | MPa | 80 - 95 |
| Thermal Conductivity | W/(m·K) | 120 - 140 |
| Ash Content | ppm | <50 |
| Max Working Temperature | °C | 1600+ |
| Capacity Range | kg | 0.5 - 100 |
Applications
- Rare earth metal melting (Nd, Pr, Dy, etc.)
- Rare earth alloy preparation
- Neodymium iron boron (NdFeB) magnet production
- Samarium cobalt magnet manufacturing
- Reactive metal melting (titanium, zirconium, etc.)
- Vacuum induction melting applications
- Laboratory and research melting processes
Why Choose Jincheng Rare Earth Melting Crucibles?
We supply high-purity graphite crucibles for rare earth metal producers and research institutions worldwide. Our crucibles are specifically engineered to resist corrosion from molten rare earth metals, providing longer service life and cleaner melting results compared to standard graphite crucibles. We offer a range of standard sizes as well as fully custom designs for your specific melting furnace and process requirements.
FAQ
Q: How long do graphite crucibles last for rare earth melting?
A: Service life depends on the specific rare earth metal, melting temperature, and atmosphere. Typically, our high-purity crucibles last for 20-50 melting cycles with proper preheating and operating procedures. Dysprosium and other heavy rare earths are more aggressive and may reduce crucible life.
Q: Should I preheat the graphite crucible before use?
A: Yes, proper preheating is essential. Gradually heat the crucible to 800-1000°C before introducing molten metal to remove moisture and prevent thermal shock. Rapid temperature changes can cause cracking and significantly reduce crucible service life.
Q: Can you provide crucibles with spouts and pouring lips?
A: Yes, we can machine custom crucible designs including pouring spouts, lips, handles, and other features. Please provide your drawings or describe your requirements, and we will manufacture crucibles tailored to your melting and pouring process.
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