Graphite crucibles are essential tools in high-temperature applications, particularly for melting metals.
Their ability to withstand extreme temperatures makes them indispensable in various industrial processes.
Understanding the Temperature Range of Graphite Crucibles
1. Maximum Temperature Tolerance
Graphite crucibles can withstand temperatures up to 3000 degrees Celsius (5472 degrees Fahrenheit).
This high-temperature tolerance makes them suitable for melting various metals, including aluminum, copper, brass, and other non-ferrous metals.
2. Oxygen Sensitivity
It is important to note that graphite is oxygen sensitive.
Graphite begins to oxidize at around 500°C (932°F) in air.
Oxidation can lead to a loss of mass and eventual structural failure if the material is repeatedly exposed to air at elevated temperatures.
3. Preventing Oxidation
To prevent oxidation, graphite crucibles should not be exposed to air while at high temperatures.
This precaution is crucial to maintain the integrity and longevity of the crucible.
4. Composition and Manufacturing
Graphite crucibles are made from high-purity graphite mixed with refractory clay, grog, and other additives.
These materials are formed into the crucible shape by extrusion or die casting and then heat treated in an oven for strengthening.
5. Key Features
The high-density, fine grain size, high purity, high strength, low specific resistance, ease of precise machining, and excellent thermal shock resistance of graphite crucibles contribute to their durability and performance at high temperatures.
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