When it comes to burning samples at high temperatures, choosing the right crucible is crucial.
Alumina ceramic crucibles are typically the go-to choice for this purpose.
These crucibles can withstand temperatures up to 1800℃ for short-term use.
1. Material and Temperature Resistance
Alumina ceramic crucibles are made of a material that can handle extreme heat.
They are suitable for melting samples with acidic substances.
However, they are not recommended for samples with alkaline substances like NaOH, Na2O2, or Na2CO3.
These alkaline substances can cause corrosion.
Additionally, these crucibles should be kept away from hydrofluoric acid (HFA).
2. High-Temperature Performance
Alumina ceramic crucibles, especially those with 99% purity, exhibit excellent high-temperature insulation properties.
They have a large thermal conductivity and low thermal expansion.
This makes them ideal for use in reduction–oxidation atmospheres up to 1700℃.
At these temperatures, alumina ceramic does not react with air, water vapor, hydrogen, or CO.
This ensures stability and safety during high-temperature operations.
3. Application in Chemical Analysis
In chemical analysis, crucibles are crucial for quantitative gravimetric analysis.
This process involves measuring the mass of a residue or precipitate after heating to remove all volatiles and moisture.
The process includes pre-weighing the crucible and lid.
Placing the residue on "ashless" filter paper inside the crucible.
Heating until the filter paper is completely burned up.
The crucible is then cooled and reweighed to determine the mass of the dried residue.
4. Specialized Crucibles for Filtration
A specific type of crucible, known as a Gooch crucible, is designed with perforated bottoms for filtration in gravimetric analysis.
These crucibles are essential tools in laboratories where precise measurement of sample residues is required.
Continue Exploring, Consult Our Experts
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