Tungsten-rhenium thermocouples

Tungsten-rhenium thermocouples is high-temperature thermocouple. It has a potential temperature good linear relationship, 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 a high-tech, high temperature electronic thermal power system structure of metallurgy industry engineering and space vehicles, nuclear reactor of ultra high temperature measuring tool. Tungsten-rhenium thermocouples thermoelectric potential accord with ZBN05003 on the relationship between the temperature -

88 indexing table, equivalent ASTME696 - 84 standard. In a vacuum, reduction, inert atmosphere, can be used within 0 ~ 2300 ℃. The use of special protection tube of tungsten-rhenium accidentally can also in the oxidation atmosphere of the long-term use under 1600 ℃, its price lower than platinum rhodium thermocouple.

overview of tungsten-rhenium thermocouples is 1931 by Goedecke ( 戈德克) First developed in the * of success to the development of the 60 s to 70 s refractory metal thermocouple. Tungsten-rhenium thermocouples features are: hot wire electrode high melting point ( 3300℃） Extremely easily, low steam and oxidation; In the oxidizing atmosphere chemistry stability is good. Electromotive force is big, high sensitivity, * is main or cheap.

tungsten-rhenium thermocouples dividing W/( W - 26Re) ，( W - 3Re) / ( W - 25Re) ，( W - 5Re) / ( W - 26Re) And ( W - 5Re) / ( W - 20Re) And so on. Long-term use of temperature of 2000 ~ 2400 ℃, short-term use * high up to 3000 ℃.

characteristics of tungsten-rhenium thermocouples is high-temperature thermocouple. It has a potential temperature good linear relationship, 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 a high-tech, high temperature electronic thermal power system structure of metallurgy industry engineering and space vehicles, nuclear reactor of ultra high temperature measuring tool.

tungsten-rhenium thermocouples thermoelectric potential accord with ZBN05003 on the relationship between the temperature -

88 indexing table, equivalent ASTME696 - 84 standard. In a vacuum, reduction, inert atmosphere, can be used within 0 ~ 2300 ℃. The use of special protection tube of tungsten-rhenium accidentally can also in the oxidation atmosphere of the long-term use under 1600 ℃, its price lower than platinum rhodium thermocouple. ( 1]

production process

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1: pre alloy powder preparation of

according to the weight percentage said anode materials and the anode material of various components, preparation of anode materials and the anode materials respectively, using high-energy disperse method, the speed of 80-3 15-150 r/min, dispersing time 20 h

2: molding

mechanical pressure molding, pressure - 150 Time 15-450 mpa 20 s

3: presintering

1300 - under the reducing atmosphere 1500 ° * 3 h

4: sintered

is divided into two segments, * *, a * 20 min, 2000 * * : 2800 - 3300 a * 450 min

5: rotary swaging:

temperature is 1300 - 1600 °, a compression ratio is more than 25% of the processing size range - 10% 20%

7: cleaning

alkaline electrolytic cleaning, alkali concentration: 15 30-20%, electrolytic voltage 100 v, 5 s time

8: annealing

the finished wire annealing temperature is 1200 - Time 30-1500 ° 60 min

9: finished product packaging

vacuum packing

the technical parameters of temperature tolerances

tungsten rhenium thermocouple temperature tolerance

use temperature 1300 ~ 1700 ℃ tolerance 0. 5% ∣ t ∣

0 ~ 2300 ℃ 1% tolerance ∣ t ∣

insulation resistance at normal temperature

normal temperature insulation resistance: tungsten-rhenium thermocouples in the ambient air temperature is 20 and 15 ℃, relative humidity is no more than

85%, thermal insulation resistance between the electrode and the external protecting tube should be greater than 100 m Ω. m。