The use environment of tungsten-rhenium thermocouples

Tungsten rhenium thermocouple temperature a potential good linear relationship, thermal stability, reliable and cheap price, etc. With display instrument, can directly measure the temperature of the liquid, steam and gas medium. It can partly replace platinum rhodium thermocouple as a high-tech, high temperature electronic thermal power system structure of metallurgy industry engineering and space vehicles, nuclear reactor of ultra high temperature measuring tool. Tungsten-rhenium thermocouples thermoelectric potential accord with ZBN05003 on the relationship between the temperature - 88 indexing table, equivalent ASTME696 - 84 standard. In a vacuum, reduction, inert atmosphere, can be used within 0 ~ 2300 ℃. The use of special protection tube of tungsten-rhenium accidentally can also in the oxidation atmosphere of the long-term use under 1600 ℃, its price lower than platinum rhodium thermocouple.

the use of tungsten-rhenium thermocouples. Measuring temperature above 1600 ℃, the non-contact method is adopted, however, the method of error is bigger, such as contact law can accurately measure the true temperature. In high temperature thermocouple, thermocouple is expensive and precious metals * high temperature can only be under 1800 ℃, and tungsten rhenium thermocouple temperature measurement not only high ceiling, and good stability, therefore, tungsten-rhenium thermocouples in metallurgy, building materials, aerospace, aviation, and nuclear power and other industries are widely used. Tungsten resources in our country, the tungsten-rhenium thermocouples cheap, can partially replace precious metal thermocouple, it is very promising in the area of high temperature test of temperature measuring materials.

temperature. It's * high temperature can reach 2800 ℃, but, when higher than 2300 ℃, scattered data. Therefore, the use of * to a temperature of 2000 ℃ or so.

using the environment atmosphere. Tungsten-rhenium thermocouples are easily oxidized, suitable for use in dry inert or hydrogen, or with dense protection tube separate it with oxygen. Cannot be used for carbon atmosphere ( As used in the atmosphere containing hydrocarbons, a temperature over 1000 ℃ or corrosion) 。 Tungsten or tungsten rhenium easy to generate stable carbides in carbon atmosphere, so that to reduce its sensitivity and cause the brittle fracture, the presence of hydrogen, will accelerate carbonization.