Porcelain crucibles are essential tools in laboratories, especially for tasks that require high-temperature resistance and chemical inertness.
5 Key Materials Explained
1. Porcelain
Porcelain is a ceramic material made from a mixture of kaolin, feldspar, and quartz.
It is fired at very high temperatures, making it highly resistant to heat.
Porcelain crucibles are known for their smooth, non-reactive surfaces, which are perfect for gravimetric chemical analysis.
2. Alumina
Alumina, or aluminum oxide, is another material commonly used in crucibles.
It has an extremely high melting point and is highly resistant to thermal shock.
Alumina crucibles are ideal for high-temperature applications where chemical inertness is critical.
3. Inert Metals
Inert metals like platinum, nickel, and zirconium are also used to make crucibles.
These metals are chosen for their resistance to corrosion and their ability to remain chemically inert at high temperatures.
Platinum crucibles, for example, are often used in applications involving corrosive materials.
4. High Melting Point
Crucibles made from these materials are designed to have a higher melting point than the substances they contain.
This ensures they can withstand the heat of the furnace without melting or degrading.
5. Loose-Fitting Lids
The lids of these crucibles are typically loose-fitting to allow gases to escape during heating.
This is crucial for preventing explosions or other hazardous situations.
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