The use of tungsten rhenium thermocouples. The non-contact method is often used to measure temperatures above 1600 ℃, but this method has a large error. For example, using the contact rule can accurately measure the actual temperature. Among high-temperature thermocouples, precious metal thermocouples are expensive and can only reach temperatures below 1800 ℃. Tungsten rhenium thermocouples not only have high temperature limits, but also have good stability. Therefore, tungsten rhenium thermocouples are widely used in industries such as metallurgy, building materials, aerospace, aviation, and nuclear energy. China has abundant tungsten resources, and tungsten rhenium thermocouples are inexpensive and can partially replace precious metal thermocouples. They are a promising temperature measurement material in the field of high-temperature testing.
Use temperature. Its maximum operating temperature can reach 2800 ℃, but data is scattered above 2300 ℃. Therefore, it is best to use at a temperature of around 2000 ℃.
Use ambient atmosphere. Tungsten rhenium thermoelectric dipoles are prone to oxidation and are suitable for use in inert or dry hydrogen gas, or can only be used by isolating them from oxygen with a dense protective tube. Cannot be used in carbon containing atmospheres (such as in atmospheres containing hydrocarbons, where temperatures exceed 1000 ℃ and corrosion occurs). Tungsten or tungsten rhenium is prone to generate stable carbides in a carbon containing atmosphere, which reduces its sensitivity and causes brittle fracture. In the presence of hydrogen gas, it accelerates carbonization.