The melting point of a crucible can vary depending on the material it is made of.
For example, a pure platinum crucible has a melting point above 1770°C. However, if alloyed with rhodium, the melting point can be elevated even further. A platinum-rhodium alloy composed of 10% or 3.5% rhodium has a melting point of 1780-1850°C.
Other types of crucibles, such as carbon-bonded and ceramic-bonded clay graphite and silicon carbide crucibles, are commonly used for melting and holding various metals and alloys. The temperature range for these crucibles can vary depending on the specific metal or alloy being melted. For example, aluminum and aluminum alloys, copper and copper-based alloys, and precious metals typically require crucibles that can withstand temperatures ranging from 400°C/750°F to 1600°C/2912°F.
It is important not to heat a crucible above its maximum temperature, as this can lead to dangerous crucible failure. Similarly, operating below the crucible's lower temperature limit can also cause problems, such as oxidation of the crucible material.
The properties of alumina crucibles are also worth considering. Alumina is often chosen for its low melting point, which is around 2000°C (3600°F), lower than other common crucible materials like graphite or molybdenum. Alumina also has a high thermal conductivity, making it easier to handle and requiring less energy to heat the crucible. Additionally, alumina is harder than iron or graphite, providing higher strength and allowing it to withstand higher internal pressure due to thermal expansion.
Overall, the melting point and properties of a crucible depend on the material it is made of and the specific metals or alloys it is intended to handle.
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