Tungsten-Rhenium Thermocouples Classification and Use

Tungsten- rhenium thermocouples is 1931 by goedecke ( Ge virtues g ) first developed out at 60 to 70 years to develop the most successful refractory metal thermocouples. Tungsten- rhenium thermocouple is characterized by: a high melting point hot wire (3300 ℃), vapor pressure, easily oxidized ; in a non- oxidizing atmosphere, good chemical stability. Emf , high sensitivity , the most important is cheap.

1 , tungsten rhenium thermocouples classification . Included in the national standards of tungsten rhenium thermocouples , there are two :

a, tungsten rhenium 5 - 26 tungsten rhenium , its positive nominal composition of 95% tungsten , 5% rhenium , tungsten cathode a nominal composition of 74% , 26% rhenium . Indexing number of wre5-wre26, abbreviated : w-re5/26.

b, 3 tungsten rhenium - tungsten rhenium 25 , its positive nominal composition of 97% tungsten , 3% rhenium , tungsten anode nominal composition of 75% , 25% rhenium . Indexing number of wre3-wre25, abbreviated : w-re3/25.

2 , the use of tungsten- rhenium thermocouples . Current measuring a temperature above 1600 ℃ , the use of non- contact method , however, the method of error is large , such as the contact law can accurately measure the real temperature . In the high-temperature thermocouples , precious metal thermocouples are expensive and the maximum temperature only in 1800 ℃ below, while tungsten rhenium thermocouple temperature limit is not only high, but good stability, therefore , tungsten rhenium thermocouples in metallurgy , building materials, aerospace , aviation and nuclear industries have been widely used . Rich resources of tungsten , tungsten- rhenium thermocouples cheap, can be partially substituted precious metal thermocouples , it is the high-temperature test promising field of temperature materials .

3, the use of temperature . Its maximum temperature can reach 2800 ℃, however , higher than 2300 ℃ , the data is scattered. Therefore , the use of temperature, preferably at about 2000 ℃ .

4 , the use of atmosphere. Easily oxidized tungsten- rhenium thermocouples , suitable for hydrogen in an inert or dry use , or dense protective tube isolated in order to use it with oxygen . Carbon-containing atmosphere can not be used ( as in the use of hydrocarbon-containing atmosphere , the temperature exceeds 1000 ℃ i.e. by corrosion) . Tungsten or tungsten- rhenium in a carbonaceous atmosphere is easy to form a stable carbide , that reduce the sensitivity and cause brittle fracture, in the case of the presence of hydrogen , is accelerated carbonation .

5 , tungsten rhenium thermocouples antioxidant . The issue has been a subject of concern to scholars at home and abroad , and is committed to study and solve . Our company adopts the international advanced making process , successfully developed a high temperature and pressure assembly type thermocouple w-re , the product temperature range of 0 ~ 1800 ℃, widely used in metallurgy , coking , chemical furnace , heat treatment, glass and other industries, it has a high accuracy , low price , stable performance, the work atmosphere free from restrictions , etc., instead of platinum and rhodium thermocouple is the ideal product. I produced the w-re thermocouple in Zhuzhou Cemented Carbide Works , Zigong Cemented Carbide factory and Shenyang Tech and other units, widely used, the performance reached the level of similar foreign products . Its technical indicators are as follows :

1 , sub-degree No. : w-re3/25, w-re5/26
2 , temperature range : 0 ~ 1800 ℃
3 , temperature measurement accuracy : <± 1% t; <± 0.5% t
4 , the time constant : ≥ 180 s
5 , insulation resistance :> 5mω
6 , Size : 300,500,750,1000,1100 (mm)

Tungsten- rhenium thermocouple temperature measurement of molten steel is designed for rapid measurement of molten steel , iron and other metals melt temperature was designed and manufactured , it has a volume of some  fast response , high accuracy and low price . Its technical indicators are as follows :

1, the maximum temperature temperature : 1800 ℃ .2, temperature measurement accuracy : ≤ 0.5% t.3, Insulation resistance : ≥ 30 mω.4, measuring the success rate : ≥ 98% .5, Response time: < ; 5 s.


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