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 flexibility is high, and the price is mainly low. 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 the contact law. Among high-temperature thermocouples, precious metal thermocouples are expensive and the high 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 used in metallurgy, building materials, aerospace , aviation and nuclear energy and other industries are widely used. my country's tungsten resources are abundant, and tungsten-rhenium thermocouples are cheap and can partially replace precious metal thermocouples (platinum-rhodium thermocouples). It is a promising temperature measurement data in the field of high temperature testing. Its high 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 oxidize and are suitable for use in inert or dry hydrogen, or to isolate them from oxygen with a dense protective tube. It cannot be used in carbon-containing atmosphere (for example, when used in an atmosphere containing hydrocarbons, it will be corroded when the temperature exceeds 1000 °C). Tungsten or tungsten-rhenium is easy to form stable carbides in carbon-containing atmosphere, which reduces its flexibility and causes brittle fracture. In the presence of hydrogen, it will accelerate carbonization. The anti-oxidation problem of tungsten-rhenium thermocouples has been a topic of concern to scholars at home and abroad, and they have been working hard to study and deal with them.
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