Graphite crucible
High-Quality Graphite Crucibles for Industrial Applications
Graphite crucibles are essential tools in high-temperature industrial processes. Our premium-grade graphite crucibles offer exceptional thermal conductivity, chemical resistance, and durability for various melting and casting applications.
Key Features of Our Graphite Crucibles:
- High-purity graphite material (99.9% carbon content)
- Excellent thermal conductivity (150-200 W/m·K)
- Extreme temperature resistance (up to 3000°C in inert atmosphere)
- Superior resistance to thermal shock
- Low wettability by molten metals
- Long service life with proper maintenance
Technical Specifications
| Parameter | Standard Grade | High Purity Grade | Special Coated Grade |
|---|---|---|---|
| Density (g/cm³) | 1.70-1.75 | 1.75-1.80 | 1.80-1.85 |
| Ash Content (%) | <0.2 | <0.05 | <0.1 |
| Compressive Strength (MPa) | 35-45 | 40-50 | 45-55 |
| Max Working Temperature (°C) | 2800 | 3000 | 3000 |
| Thermal Conductivity (W/m·K) | 150-170 | 170-190 | 180-200 |
Graphite Crucible Sizes and Capacities
| Model | Internal Diameter (mm) | Height (mm) | Wall Thickness (mm) | Capacity (kg) |
|---|---|---|---|---|
| GC-50 | 50 | 80 | 10 | 0.5 |
| GC-100 | 100 | 150 | 15 | 2.0 |
| GC-150 | 150 | 200 | 20 | 5.0 |
| GC-200 | 200 | 250 | 25 | 10.0 |
| GC-300 | 300 | 350 | 30 | 25.0 |
Graphite Crucible Applications
- Precious metal melting (gold, silver, platinum)
- Non-ferrous metal processing (aluminum, copper, zinc)
- Semiconductor crystal growth
- High-temperature chemical reactions
- Laboratory research and experiments
- Jewelry manufacturing
Graphite Crucible Frequently Asked Questions
Q: How long does a graphite crucible typically last?
A: The lifespan of a graphite crucible depends on several factors including operating temperature, type of metal being melted, and maintenance practices. Under normal conditions with proper care, our standard graphite crucibles can last for 50-100 melting cycles when used for precious metals, or 20-50 cycles for more aggressive metals like aluminum. High-purity grades typically last 30% longer than standard grades.
Q: What precautions should I take when using a graphite crucible?
A: Proper handling extends crucible life significantly. Always preheat new crucibles gradually to 200°C before first use to remove moisture. Avoid thermal shocks by not exceeding 300°C/min heating or cooling rates. Never leave molten metal in a cooled crucible. Use appropriate tongs that don't damage the crucible rim. Store in dry conditions when not in use. For specific metals, consider using protective coatings or fluxes.
Q: Can graphite crucibles be used with all types of metals?
A: While graphite crucibles are versatile, they're not suitable for all metals. They work excellently with precious metals, copper, brass, aluminum, and zinc. However, they should not be used with iron, steel, or other high-carbon-affinity metals that can carburize. Reactive metals like titanium or zirconium can also damage graphite crucibles. For these applications, consider specially coated graphite or alternative materials like clay-bonded graphite.
Maintenance Tips for Graphite Crucibles
- Clean after each use with appropriate tools (brass brush recommended)
- Store in dry, temperature-controlled environment
- Inspect regularly for cracks or excessive wear
- Apply protective coatings when recommended
- Rotate crucibles to distribute wear evenly
Why Choose Our Graphite Crucibles?
Our graphite crucibles are manufactured using premium materials and strict quality control processes. We offer:
- ISO-certified production facilities
- Custom sizes and specifications available
- Technical support and application guidance
- Competitive pricing with bulk discounts
- Fast shipping and reliable packaging