What is the temperature range of graphite crucible?

The temperature range of a graphite crucible depends on the specific material grade and application conditions. Generally, graphite crucibles are known for their excellent high-temperature performance and can withstand temperatures up to 3000°C (5432°F) under certain conditions. However, there are key considerations:

Graphite Crucible Temperature Ranges

Maximum Operating Temperature

In inert or reducing atmospheres (e.g., argon, nitrogen, or vacuum): Up to 3000°C.

In oxidizing atmospheres: Typically limited to around 500-700°C, unless protected by coatings or special treatments. This is due to the susceptibility of graphite to oxidation at high temperatures.

Thermal Shock Resistance

Graphite crucibles can endure rapid temperature changes without cracking, making them suitable for applications requiring frequent heating and cooling cycles.

Application-Specific Ranges

For melting metals like gold, silver, or aluminum: Operating temperatures generally range from 600°C to 1500°C.

For melting high-temperature alloys or refractory metals: Temperatures can exceed 2000°C.

Factors Influencing Temperature Tolerance

Atmosphere: Graphite performs best in environments free from oxygen to prevent oxidation.

Material Quality: High-purity graphite offers better thermal resistance and durability.

Coatings: Crucibles with anti-oxidation coatings can operate at higher temperatures in air.

Usage and Maintenance: Proper handling and gradual heating can help achieve optimal temperature performance.