Temperature is one of the primary thermal parameters. Nowadays, chemical processes have entered the era of automatic control, and temperature measurement in high-temperature thermochemical processes has become increasingly common. Thermocouples are widely used tools for high-temperature measurement and control. However, at high temperatures, thermocouples often suffer from inaccurate readings or damage due to corrosion or other chemical reactions. In such scenarios, thermocouples must be equipped with protective sleeves that possess excellent thermochemical stability and impermeability to function effectively.

Molybdenum disilicide protective tubes belong to the category of cermet tubes and serve to isolate thermocouples or other heating elements that require protection from the working environment, thereby extending their service life. Molybdenum disilicide protective tubes are another high-temperature product developed based on the materials of silicon molybdenum rod elements, falling between metals and ceramics. Compared to other similar products, they offer superior thermal shock resistance, oxidation resistance, gas tightness, and mechanical properties. They are characterized by high-temperature corrosion resistance and excellent thermal stability. They are suitable for use in environments involving oxidation, reduction, alternating oxidation and reduction, certain chemically corrosive gases, and molten metals. When used for protecting temperature measurement elements in industries such as natural gas, fertilizers, metallurgy, refractory materials, ceramics, cement, carbon black, machinery, petrochemicals, and coal chemical processing, their performance surpasses that of other types of protective tubes.