Tungsten-rhenium thermocouple
Tungsten-rhenium thermocouple is characterized by high melting point of hot electrode wire (3300℃), low vapor pressure, easy oxidation; Good chemical stability in non-oxidizing atmosphere. Electromotive force, high sensitivity, the most important or cheap price.
At present, the non-contact method is used to measure the temperature above 1600℃, but the error of this method is large, such as the contact rule can accurately measure the real temperature. In high temperature thermocouple, precious metal thermocouple is expensive and the highest temperature can only be below 1800℃, while tungsten-rhenium thermocouple is not only high temperature limit, but also good stability, therefore, tungsten-rhenium thermocouple in metallurgy, building materials, aerospace, aviation and nuclear energy and other industries have been widely used. Tungsten resources are abundant in China, tungsten-rhenium thermocouple is cheap, can partly replace precious metal thermocouple (platinum-rhodium thermocouple), it is a promising temperature measurement material in the field of high temperature testing. Thermocouple preferred medium energy meter.
Its maximum operating temperature can reach 2800℃, however, above 2300℃, data dispersion. Therefore, the use of temperature in the best about 2000℃.
Tungsten-rhenium thermocouples are easily oxidized and are suitable for use in inert or dry hydrogen gas, or they can only be used by isolating them from oxygen with dense protective tubes. Cannot be used in the atmosphere containing carbon (such as in the atmosphere containing hydrocarbons, the temperature exceeds 1000℃ will be corroded). Tungsten or tungsten-rhenium tends to form stable carbides in a carbon-containing atmosphere, resulting in reduced sensitivity and brittle fracture, and accelerated carbonization in the presence of hydrogen.
Tungsten-rhenium thermocouple oxidation resistance has been the focus of domestic and foreign scholars, and is committed to research and solution. Widely used in metallurgy, coking, chemical furnace, heat treatment, glass and other industries, it has the advantages of high precision, low price, stable performance, not limited by the working environment atmosphere, is the ideal product to replace platinum rhodium thermocouple.
Tungsten-rhenium hot steel thermocouple is specially designed for measuring the temperature of molten steel, liquid iron and other metals. It has the advantages of small volume, fast thermal response, high accuracy and low price.
