When it comes to crucibles, one of the most important questions is: what temperature can a crucible withstand?
The answer depends significantly on its material composition and the specific conditions of use.
5 Key Factors to Consider
1. Material Composition
For instance, an 85% alumina ceramic crucible can operate effectively in a reduction–oxidation atmosphere at temperatures ranging from 1290°C to 1350°C.
It has a maximum short-term working temperature of 1400°C.
This type of crucible exhibits excellent high-temperature insulation properties, mechanical strength, and low thermal expansion.
2. Extreme Conditions
In more extreme conditions, such as those requiring a crucible to withstand both oxidizing and reducing atmospheres, a crucible made from 99.6% alumina (Al2O3) can be used at operating temperatures up to 1750°C.
This high-purity alumina crucible is particularly inert to hydrogen, carbon, and refractory metals, enhancing its suitability for high-temperature applications.
3. Maximum Temperature
It's crucial to note that the maximum temperature a crucible can handle is not the only factor to consider.
4. Rate of Temperature Change
The rate of temperature change and the specific metals being melted or held also play significant roles in crucible selection and performance.
Crucibles must be chosen based on their ability to resist thermal shock, which is particularly important in applications involving rapid temperature fluctuations.
5. Thermal Shock Resistance
For example, crucibles with high carbon content, such as those made from graphite, offer high thermal conductivity and thermal shock resistance.
These are ideal for foundry applications where temperatures can change dramatically in a short time.
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