Molybdenum thermocouple protection tubes are metal sleeves used to protect the internal thermocouple wires (usually tungsten-rhenium thermocouples) in extreme environments. Its core function is to isolate the thermocouple from harsh measurement environments, ensuring the accurate, stable and long-term transmission of temperature signals.It is mainly made of high-purity metallic molybdenum (Mo) or molybdenum alloys, and is usually equipped with tungsten-rhenium (W-Re) series thermocouples inside. This is because they can measure extremely high temperatures (up to over 2300℃) and are well-matched with the physical and chemical properties of molybdenum at high temperatures, forming a complete ultra-high temperature thermocouple temperature measurement component. The protective tube, as a solid barrier, directly withstands high temperatures, corrosion, erosion and pressure, isolating the internal precision thermocouple wire from these harmful factors, thereby extending the service life of the thermocouple.
The reason why molybdenum thermocouple protection tubes are irreplaceable mainly lies in their unique advantages such as extremely high temperature resistance, excellent high-temperature structural stability, good resistance to reducing atmosphere, low coefficient of thermal expansion and relatively good vacuum performance.
The application scenarios of molybdenum thermocouple protection tubes are highly specialized, mainly concentrated in vacuum heat treatment furnaces, semiconductor industry, aerospace field, nuclear industry, rare earth smelting and glass industry, as well as scientific research laboratories and other industrial and research fields that require ultra-high temperature measurement. It is a key component for solving the problem of ultra-high temperature measurement at 1800℃ to 2000℃. With its extremely high melting point and high-temperature strength, it performs well in vacuum, inert and reducing atmospheres.
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