What Are The Materials Of Thermocouple Sleeves?

The materials of thermocouple sleeves mainly include two categories: metal and non-metal. ‌Metal materials such as stainless steel, nickel-chromium alloy, tungsten-molybdenum alloy, etc. have good corrosion resistance and high temperature performance, and are suitable for different industrial environments. Stainless steel has good corrosion resistance and strong processability, and is suitable for general industrial occasions and precision instruments; nickel-chromium alloy is resistant to oxidation and high temperature, and is suitable for high temperature environment or strong corrosive environment; tungsten-molybdenum alloy has excellent high temperature strength and corrosion resistance, and is suitable for high temperature and high pressure environment. Non-metallic materials such as high temperature ceramics, silicon carbide, zirconium oxide, etc. are also commonly used in thermocouple sleeves, which have the characteristics of high temperature resistance and wear resistance. ‌

‌Thermocouple sleeves of different materials have their own characteristics in performance. ‌Stainless steel is relatively cheap and has good processability, and is suitable for general industrial occasions; nickel-chromium alloy is resistant to oxidation and high temperature, and is suitable for high temperature environment or strong corrosive environment; tungsten-molybdenum alloy has excellent high temperature strength and corrosion resistance, but it is more difficult to process. Non-metallic materials such as high-temperature ceramics, silicon carbide, zirconium oxide, etc. are mainly used for temperature measurement in high-temperature and highly wear-resistant working conditions, such as cement kiln tail, circulating fluidized bed, etc.

‌Selecting the appropriate thermocouple sheath material requires consideration of factors such as the use environment, working temperature and corrosion resistance. ‌For general industrial occasions and precision instruments, stainless steel is a better choice; in high-temperature environments or highly corrosive environments, nickel-chromium alloys or tungsten-molybdenum alloys are more suitable; if both high temperature and corrosion resistance are required, nickel-based alloys can be selected.