Alumina crucibles, especially those with high purity like 99.6% alumina, can handle extremely high temperatures. This makes them perfect for various high-temperature applications.
The maximum temperature an alumina crucible can withstand depends on its purity and the conditions it's used under.
For 85% alumina ceramic crucibles, the maximum working temperature is 1400°C for short-term use.
99.6% alumina crucibles can withstand up to 1750°C.
These crucibles also show excellent high-temperature insulation properties, high thermal conductivity, and low thermal expansion.
They have high mechanical strength and chemical resistance.
4 Key Factors Explained: What Temperature Can Alumina Crucibles Withstand?
1. Temperature Resistance of Alumina Crucibles
85% Alumina Crucibles: These can handle temperatures up to 1400°C for short-term use. They are suitable for long-term use in stable environments where temperature changes are not rapid.
99.6% Alumina Crucibles: These can handle even higher temperatures, up to 1750°C. This makes them ideal for more demanding high-temperature applications.
2. Thermal Properties
High Thermal Conductivity: Alumina has high thermal conductivity. This makes handling easier and requires less energy to heat the crucible.
Low Thermal Expansion: Alumina crucibles show low thermal expansion. This helps maintain their structural integrity under temperature fluctuations.
3. Mechanical Strength
Alumina is harder than many other materials used for crucibles, like iron or graphite. This provides high mechanical strength and the ability to withstand higher internal pressures due to its high thermal expansion coefficient.
4. Chemical Resistance
High purity alumina products maintain good chemical resistance under high temperatures. They have excellent wear and abrasion resistance, making them suitable for use in reducing, inert, or high vacuum conditions.
Handling and Maintenance
Alumina crucibles are sensitive to thermal shock. It's recommended to heat and cool them slowly to prevent damage. A heating rate of 150-300°C per hour and a cooling rate of 75-150°C per hour are recommended to minimize the impact of thermal shock.
These properties make alumina crucibles a preferred choice for various high-temperature applications in laboratories and industrial settings. They ensure reliable performance and durability under extreme conditions.
Continue Exploring, Consult Our Experts
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