Graphite crucibles are highly heat-resistant containers used in metallurgical, foundry, and laboratory applications for melting and casting metals or other high-temperature materials. The unique properties of graphite make these crucibles suitable for extreme temperatures, as they can withstand very high thermal loads without degrading or breaking down.
● Maximum Operating Temperature: Graphite crucibles can typically withstand temperatures up to 2,900°C (5,252°F). This makes them ideal for melting metals with high melting points like platinum, gold, silver, copper, and iron.
● Minimum Temperature: There is no specific minimum temperature for graphite crucibles. However, they perform best at high temperatures and are not typically used at low temperatures.
● Continuous Operating Range: In continuous use, the typical operating temperature range for a graphite crucible is between 500°C to 2,500°C (932°F to 4,532°F). This range ensures safe operation and longevity.
Different metals have varying melting points. For example, aluminum melts around 660°C, while iron melts at 1,538°C. The crucible must handle the specific temperatures required for the metal being processed.
Graphite is stable in inert or reducing atmospheres (such as argon or nitrogen). However, in oxidizing environments, it can degrade at lower temperatures (around 500°C to 700°C). Protective coatings or an inert atmosphere are often used to extend the lifespan of the crucible.
Graphite crucibles have excellent thermal shock resistance, allowing them to handle rapid temperature changes without cracking. However, sudden extreme temperature changes can still lead to wear and tear over time.
Melting of aluminum, lead, tin, and zinc.
Applications involving low-melting-point metals and some ceramics.
Melting of gold, silver, copper, brass, and iron.
Foundry applications and laboratory testing of high-temperature alloys.
Production of materials like silicon carbide and other advanced ceramics.
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