The highest temperature in a crucible depends on the material of the crucible.
Graphite crucibles can withstand temperatures as high as 5000°F (2760°C). They are commonly used in furnaces and high heat processes in various industries such as foundries, laboratories, and heavy-duty applications.
Platinum-gold crucibles have a lower maximum temperature limit of 1500°C (2732°F) due to the softening of the crucible material. These crucibles are often used for fusion processes, with fusion times as short as 3 minutes. They are also equipped with a viewing glass to observe the fusion and solidification processes.
Carbon-bonded and ceramic-bonded clay graphite and silicon carbide crucibles are widely used for melting and holding various metals such as aluminum, copper, bronze, nickel, and precious metals. These crucibles can withstand temperature ranges from 400°C (750°F) to 1600°C (2912°F).
High-purity graphite crucibles are designed to withstand temperatures up to 3000°C (5472°F). They are ideal for melting metals like aluminum, copper, and brass without the risk of contamination or damage due to heat stress. High-purity graphite crucibles have enhanced corrosion resistance, improved strength and stability at high temperatures, and extended service life.
Alumina ceramic crucibles have different temperature limits depending on the specific type. Under a reduction-oxidation atmosphere, an 85% alumina ceramic crucible can withstand temperatures from 1290°C to 1350°C (2344°F to 2462°F) for long-term use. The maximum working temperature for short-term use is 1400°C (2552°F). Alumina ceramic crucibles can withstand temperatures up to 1200°C (2192°F) and are suitable for melting samples with acidic substances.
In general, crucibles are designed with materials that have higher melting points than the metals they are used to melt. This ensures that the crucibles can withstand the high temperatures encountered in furnace operations. Different crucible materials, such as clay-graphite, silicon-carbide, and more, are used based on the specific requirements of the melting process.
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