Tungsten-Rhenium Thermocouples Introduction and Failure Analysis

Tungsten- rhenium thermocouples is 60 years developed a high-temperature thermocouples, tungsten / ( tungsten- rhenium -26 ) , ( -3 tungsten rhenium ) / ( -25 tungsten rhenium ) , ( tungsten- rhenium -5 ) / ( W - 26 rhenium ) and ( tungsten rhenium -5 ) / ( -20 tungsten rhenium ), etc. Long-term use temperature of 2000 ~ 2400 ℃, short-term use up to 3000 ℃. In the low-temperature thermocouples , ( copper -2.1 cobalt ) / Cu thermocouple, the 10K or more thermoelectric power greater than 10μV / K; gold contains trace amounts ( about 0.07 atomic percent ) alloy of iron and nickel-chromium alloy thermocouples at liquid helium temperature (4K) thermoelectric power greater than 10μV / K, all the better . ( Pt -0.1 Mo ) / ( Pt -5 Mo ) , ( Pt -1 Mo ) / ( Pt -5 Mo ) and tungsten , and 0.5 to 1 ( atomic% ) alloy of osmium and rhenium tungsten alloy thermocouples etc. can be used in the nuclear radiation conditions . In addition to metallic materials, graphite and other non-metallic materials, refractory compounds can also be used as high temperature thermocouples. The advantage of such materials are high melting point , high temperature stability, high thermal potential and thermoelectric power , etc. ; drawback is brittle materials , graphite is easy to absorb moisture and changes in thermal resistance , poor reproducibility , but also in research and development into . Such thermocouples with carbon / graphite , graphite / carbide , carbide / carbide .

Tungsten- rhenium thermocouples ! Generally in a vacuum or reducing atmosphere used , if the transmission distance is long , it requires specialized wire compensation .

Tungsten- rhenium thermocouple as an excellent high-temperature measurement sensor , the maximum temperature can reach 2800 ℃, is currently measured temperature above 1800 ℃ better contact industrial thermocouples, are widely used in aero-engine plume exploration , petrochemical heavy oil cracking furnace, coal gasification , metallurgical atmosphere furnace , nuclear reactor core temperature measurement. tungsten rhenium thermocouple wire in an inert gas and dry hydrogen thermoelectric properties stable, but vulnerable in an oxidizing atmosphere oxidation at different oxygen partial oxidization of the linear , when a very complete oxidation of the material properties which cause a qualitative change , it will lead to fundamental changes in thermoelectric properties .

1 In order to make the tungsten rhenium thermocouple wire used in an oxidizing atmosphere , and foreign scholars have done a lot of research, using a variety of oxidation technology so that it can be applied to an oxidizing atmosphere , for example , the coating protection law, taking the sealing Protection Act , taking the inflatable seal protection law, fill seal protection law.

2 , but on the tungsten rhenium thermocouple wire in nitrogen , high temperature stability of carbon in the environment has not been reported in this study through the tungsten rhenium thermocouples field failure analysis , discussion in nitrogen, high-temperature carbon environment, tungsten failure of rhenium thermocouples , has obvious theoretical significance and practical value !

Are many types of thermocouples , thermocouple domestic industry is widely used for the current product quality and classification of the different manufacturers , product quality and performance has a different problem , as technology continues to improve , the product and quality of life has made ​​great progress !


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