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The tungsten - rhenium thermocouple with small size and fast thermal response speed is introduced

The tungsten - rhenium thermocouple with small size and fast thermal response speed is introduced


  The characteristics of tungsten-rhenium thermocouple are: high melting point of hot electrode wire (3300℃), low vapor pressure, easy oxidation; Good chemical stability in non-oxidizing atmosphere. Large electromotive force, high sensitivity, the most important or low price. At present, non-contact method is mostly used to measure the temperature above 1600℃. However, the error of this method is large. If the contact rule is used, the true temperature can be accurately measured.

  In the high temperature thermocouple, the precious metal thermocouple is expensive and the highest temperature can only be below 1800℃, while the tungsten-rhenium thermocouple is not only the upper limit of temperature measurement, but also has good stability. Therefore, the tungsten-rhenium thermocouple is widely used in metallurgy, building materials, aerospace, aviation and nuclear energy and other industries. China has abundant tungsten resources, and the tungsten-rhenium thermocouple has low price, which can partially replace the precious metal thermocouple (platinum-rhodium thermocouple). It is a promising temperature measurement material in the field of high temperature testing.

  Its maximum operating temperature can reach 2800℃, however, above 2300℃, data dispersion. Therefore, the best operating temperature is about 2000℃. Tungsten-rhenium thermocouple is easily oxidized and is suitable for use in inert or monotonic hydrogen, or with a dense maintenance tube to isolate it from oxygen. Can not be used in atmospheres containing carbon (such as in atmospheres containing hydrocarbons, the temperature beyond 1000℃ is corroded).

  Tungsten or tungsten-rhenium can easily form stable carbides in the atmosphere containing carbon, which reduces the sensitivity and causes brittle fracture, and accelerates carbonization in the presence of hydrogen. The oxidation resistance of tungsten-rhenium thermocouple has been the focus of scholars at home and abroad. Our company adopted the international advanced fabrication process, successfully developed the prefabricated tungsten-rhenium thermocouples, high temperature and pressure of the product temperature range of 0 ~ 1800 ℃, widely used in metallurgy, coking, chemical furnace, heat treatment, glass and other industries, it has high precision, low price, stable performance, without being limited by the working environment atmosphere, etc.

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