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The parameters of tungsten-rhenium thermocouples and use skills _ instrument

by:JVTIA     2020-10-28
Tungsten-rhenium thermocouples has so many features, it is conceivable that it is how the application field of tungsten-rhenium thermocouples are widely. Let the tungsten-rhenium thermocouples can give full play to their role, the important is the operation of tungsten-rhenium thermocouples. Tungsten-rhenium thermocouples used skills: tungsten rhenium thermocouple temperature tolerance using temperature of 1300 ~ 1700 ℃ tolerance 0. 5% t use 0 ~ 2300 ℃ temperature tolerance 1% t 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 the classification of tungsten-rhenium thermocouples listed in the national standard in our country there are two kinds of tungsten-rhenium thermocouples: ( 1) 5 - tungsten rhenium 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, abbreviated: w - re5/26。 ( 2) 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, abbreviated: w - re3/25。 Tungsten-rhenium thermocouples measuring temperature above 1600 ℃, the use of non-contact method is used, 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 can only high temperature 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. Its high temperature can reach 2800 ℃, but, when higher than 2300 ℃, scattered data. Therefore, the use of temperature at about 2000 ℃. 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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