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Tungsten-rhenium thermocouples _ instrument

by:JVTIA     2020-10-29
Tungsten rhenium thermocouple temperature a potential good linear, 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 metallurgical industry, high temperature electronic thermoelectric system structure engineering and space vehicles, nuclear reactor of ultra high temperature measuring tool. Applicable to the vacuum, reduction, inert atmosphere, can be used within 0 ~ 2300 ℃. The use of special protection tube of tungsten-rhenium accidentally can also be the oxidizing atmosphere of long-term use under 1600 ℃. Tungsten rhenium thermocouple temperature tolerance using temperature of 1300 ~ 1700 ℃ tolerance 0. 5% ∣ t ∣ 0 ~ 2300 ℃ 1% tolerance ∣ t ∣ room temperature insulation resistance: tungsten-rhenium thermocouples in the ambient air temperature is 20 and 15 ℃, relative humidity is not more than 85%, the thermal insulation resistance between the electrode and the external protecting tube should be greater than 100 m Ω. m。 Introduction of tungsten-rhenium thermocouples 1, tungsten-rhenium thermocouples tungsten-rhenium 5 - Tungsten rhenium 26 and tungsten rhenium 3 - Tungsten-rhenium two tungsten rhenium 5-25 Tungsten-rhenium 26, it is the name of the anode components in containing 5% 95%, rhenium, tungsten cathode nominal composition of containing 74%, 26% rhenium tungsten. Index number of WRe5 - WRe26, dividing number: W - Re5/26。 Tungsten-rhenium 3 - Tungsten-rhenium 25, it the name of the anode components in containing 3% 97%, rhenium, tungsten cathode nominal composition of containing 75%, 25% rhenium tungsten. Index number of WRe3 - WRe25, dividing number: W - Re3/25。 2, tungsten rhenium thermocouple temperature can reach 2800 ℃, but, when higher than 2300 ℃, scattered data. Therefore, the use of around 2000 ℃ temperature well. 3, 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.
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