Precautions for Using Graphite Crucibles
Graphite crucibles are primarily used for melting metal materials and are made from graphite, silicon carbide, silica, refractory clay, pitch, and tar. When using graphite crucibles, it is essential to keep the following precautions in mind:
- Support During Heating: Since the bottom of the graphite crucible is quite small, it needs to be placed on a graphite pad or clay triangle while heating to ensure stability and even heating.
- Handling Post-Heating: Graphite crucibles can be directly heated. However, after heating, they should not be cooled abruptly. Use crucible tongs to remove the crucible, and avoid placing it on a cold metal surface to prevent damage from rapid cooling.
- Inspection for Cracks: Always check the graphite crucible for any visible cracks or defects before use. Additionally, regular inspections should be conducted after use to ensure the crucible remains in good condition.
Following these three key points will help maintain the efficiency and longevity of graphite crucibles, ensuring safe and effective operation.