The characteristics of the tungsten-rhenium thermocouple are: the hot electrode wire has a high melting point (3300 ° C), a low vapor pressure, and is easily oxidized; it has good chemical stability in a non-oxidizing atmosphere. The electromotive force is large, the sensitivity is high, and the most important thing is the low price. At present, the non-contact method is mostly used to measure the temperature above 1600 ℃, but the error of this method is relatively large. For example, the real temperature can be accurately measured by using the contact law. Among high-temperature thermocouples, precious metal thermocouples are expensive and the maximum temperature can only be below 1800 °C, while tungsten-rhenium thermocouples not only have a high temperature measurement limit, but also have good stability. Therefore, tungsten-rhenium thermocouples are widely used in metallurgy, building materials, aerospace , aviation and nuclear energy and other industries are widely used. my country's tungsten resources are abundant, and the price of tungsten-rhenium thermocouples is low. It can partially replace precious metal thermocouples (platinum-rhodium thermocouples). It is a promising temperature measurement material in the field of high-temperature testing. Its maximum operating temperature can reach 2800 ℃, however, when it is higher than 2300 ℃, the data is scattered. Therefore, the operating temperature is preferably around 2000 °C. Tungsten-rhenium thermocouples are easy to be oxidized and are suitable for use in inert or monotonic hydrogen, or to isolate them from oxygen with a dense protective tube. It cannot be used in a carbon-containing atmosphere (such as in an atmosphere containing hydrocarbons, the temperature exceeds 1000 ° C and it will be corroded). Tungsten or tungsten-rhenium is prone to form stable carbides in a carbon-containing atmosphere, which reduces its sensitivity and causes brittle fracture. In the presence of hydrogen, it will accelerate carbonization. The problem of anti-oxidation of tungsten-rhenium thermocouples has always been a topic of concern to scholars at home and abroad, and efforts have been made to study and deal with them. Our company adopts the international advanced manufacturing technology and successfully developed the assembled high temperature and high pressure tungsten rhenium thermocouple. It has the advantages of high precision, low price, stable performance, and is not limited by the working environment and atmosphere.
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