Alumina, also known as aluminum oxide (Al2O3), is fired at temperatures ranging from 1350°C to 1800°C.
This wide temperature range ensures that alumina products achieve high purity, excellent chemical resistance, and superior mechanical strength.
Understanding these firing temperatures is crucial for lab equipment purchasers to ensure the materials meet their specific needs in terms of durability, resistance, and performance.
5 Key Points Explained: What Temperature is Alumina Fired At?
1. Temperature Range for Firing Alumina
Alumina is typically fired at temperatures between 1350°C and 1800°C.
This range is derived from various applications and the desired properties of the alumina products.
For instance, firing at 1350°C for 20 minutes can achieve a density of about 99% of the theoretical value and a grain size of 1.2 μm.
2. High Purity Alumina Products
High purity alumina products can withstand very high temperatures under reducing, inert, or high vacuum conditions.
They remain chemically resistant and have excellent wear and abrasion resistance.
The highest temperature that 99.6% alumina products can withstand is up to 1750°C (3182°F).
3. Alumina Furnace Tube Characteristics
Alumina furnace tubes exhibit high purity (Al2O3 > 99%) and good chemical resistance.
They can be used long-term at 1600°C and short-term at 1800°C.
These tubes also have good resistance to rapid heat and cold, making them less prone to bursting.
4. Alumina Crucible Properties
Alumina crucibles have a lower melting point (about 2000°C) compared to other materials like graphite or molybdenum.
They also have high thermal conductivity (about 3000 W/m·K) and high strength, making them suitable for handling high internal pressures due to their high thermal expansion coefficient.
5. Usage Considerations for Alumina Tubes
When using alumina tubes for the first time, they need to be preheated to eliminate stress and pollutants.
The recommended heating rate is 5~8°C/min, reaching up to 1300°C and holding for 30 minutes.
The temperature rise and cooling rates should be controlled to avoid damage to the material.
6. Reduction-Oxidation Atmosphere Applications
In a reduction-oxidation atmosphere, 85% alumina ceramic crucibles show excellent high-temperature insulation properties and mechanical strength.
They can be used for long-term applications in stable environments where temperature changes are not too rapid, with a maximum working temperature of 1400°C for short-term use.
Understanding these key points helps lab equipment purchasers make informed decisions about the appropriate alumina products for their specific needs.
The firing temperature plays a crucial role in determining the final properties of the alumina, such as purity, resistance, and strength, which are essential for various laboratory applications.
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