The highest temperature heating element is made from tungsten, which can operate up to 2800°C (5075°F). However, in practice, this rating is often downgraded due to factors such as embrittlement when exposed to oxygen or water vapor, and sensitivity to changes in emissivity.
Tungsten is a material with excellent electrical, mechanical, and thermal properties, similar to molybdenum, but with a much higher melting point. This makes it suitable for use in high-temperature applications, such as specialized heat treatment processes. Tungsten heating elements are capable of withstanding high temperatures and maintaining their strength and stability. However, they must be used with a ramping temperature control system to prevent embrittlement due to overheating, especially during cold start-up conditions.
It is important to note that tungsten heating elements must not be exposed to air while at elevated temperatures, as they oxidize in air starting around 500°C (932°F) and rapidly above about 1200°C (2192°F). Under specific conditions, such as at a pressure of less than 10-2 torr, tungsten can be used up to 2000°C (3632°F), and at less than 10-4 torr, it is resistant to evaporation up to roughly 2400°C (4,352°F).
In summary, tungsten is the material with the highest allowable operating temperature for heating elements, but its practical use may be limited by factors such as oxidation, embrittlement, and sensitivity to changes in emissivity. Proper control systems and operating conditions are necessary to ensure the longevity and effectiveness of tungsten heating elements.
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