Tungsten- rhenium thermocouples is high temperature thermocouples. It has the potential of a linear relationship between temperature , thermal stability , reliable, cheap, etc. . And display instrument for direct measurement of liquids , steam and gases such as temperature. It can partially substitute platinum-rhodium thermocouple as high metallurgical industry , high-temperature electronic thermoelectric systems and space vehicle structural engineering , ultra-high temperature nuclear reactors measurement tools .

Tungsten- rhenium thermocouples for temperature dependence of thermopower meet ZBN05003-88 indexing table , equivalent ASTME696-84 standards. In a vacuum , reducing , inert atmosphere , at 0 ~ 2300 ℃ range. The use of special protective tube tungsten rhenium even can at 1600 ℃ under oxidizing atmosphere, long-term use , its price is lower than the platinum- rhodium thermocouple .

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. Tungsten- rhenium thermocouples is 60 years developed a high temperature thermocouple, a W / (W-26Re), (W-3Re) / (W-25Re), (W-5Re) / (W-26Re) and ( W-5Re) / (W-20Re) and so on. Long-term use temperature of 2000 ~ 2400 ℃, short-term use up to 3000 ℃. In the low-temperature thermocouples , (Au-2.1Co) / 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 composition thermocouple, at liquid helium temperature (4K) thermoelectric power greater than 10μV / K, all the better . (Pt-0.1Mo) / (Pt-5Mo), (Pt-1Mo) / (Pt-5Mo) and tungsten , and 0.5 to 1 ( atomic% ) alloy of osmium and rhenium tungsten alloy thermocouples in nuclear irradiation 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 .


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A tungsten rhenium thermocouples overview

Tungsten- rhenium thermocouples is high temperature thermocouples. It has the potential of a linear relationship between temperature , thermal stability , reliable, cheap, etc. . And display instrument for direct measurement of liquids , steam and gases such as temperature. It can partially substitute platinum-rhodium thermocouple as high metallurgical industry , high-temperature electronic thermoelectric systems and space vehicle structural engineering , ultra-high temperature nuclear reactors measurement tools .
Tungsten- rhenium thermocouples for temperature dependence of thermopower meet ZBN05003-88 indexing table , equivalent ASTME696-84 standards. In a vacuum , reducing , inert atmosphere , at 0 ~ 2300 ℃ range. The use of special protective tube tungsten rhenium even can at 1600 ℃ under oxidizing atmosphere, long-term use , its price is lower than the platinum- rhodium thermocouple .

Second, tungsten rhenium thermocouple temperature tolerance tungsten rhenium thermocouples

Temperature 1300 ~ 1700 ℃ Tolerance 0.5% | t |
0 ~ 2300 ℃ Tolerance 1% | t |

Third, temperature insulation resistance : tungsten rhenium thermocouples in the ambient air temperature of 20 ± 15 ℃, relative humidity less than 85% , the heat between the electrode and the outer protection tube insulation resistance should be greater than 100MΩ.m.

Forth , tungsten rhenium 3/ 25 tungsten rhenium thermocouple protection tube outer

( 1 ) silicon carbide tube (Sic) at 1600 ℃ oxidizing atmosphere using the following
( 2 ) molybdenum disilicide tube (Mosi2) at 1600 ℃ under air and some corrosive atmospheres ( supply agreement )
( 3 ) molybdenum tube (Mo) at 2300 C in vacuum using the following ( supply agreement )
( 4 ) tantalum tube (Ta) at 2300C using the following vacuum ( supply agreement )

Fifth , tungsten rhenium thermocouple indexing are: tungsten rhenium 3 - 25 tungsten rhenium , tungsten, rhenium 5 - tungsten- rhenium 26.


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1, Tungsten- rhenium thermocouples metallurgical industry , powder metallurgy applications

metallurgy products usually in reducing atmosphere such as hydrogen production , the working temperature 1000 ~ 1800 ℃. Just using sintered corundum tube or pipe , materialized oxidation of tungsten rhenium thermocouple powder metallurgy plant in Xiangtan and other applications for many years.

2, Tungsten- rhenium thermocouples VN , manganese nitrogen, boron carbide and chromium -nitrogen alloy Si3N4 powder production application

currently about VN , nitrogen alloy chromium , manganese alloy production and nitrogen Si3N4 powder production process control, more mining materialized oxidation of tungsten rhenium thermocouples, 2003 in the amount of 500 above , access to users.

3, Tungsten- rhenium thermocouples nonferrous metallurgy application
application
in lead smelting process, in order to lead slag can be well separated , often using electric front bed of new technology, the sensor must be exposed to high temperatures , corrosive media. Testing environment is extremely harsh , resulting in a very short life platinum-rhodium thermocouple ( only two weeks or so ) , materialized oxidation of tungsten rhenium thermocouples can not only replace expensive platinum-rhodium thermocouple, but life is doubled.

4, Tungsten- rhenium thermocouples materialized oxidation of tungsten rhenium thermocouples application < / span>

in Chemical Plant pyrolysis furnace using tungsten- rhenium thermocouples replace platinum and rhodium even, at 1400 ℃ under a reducing atmosphere , the use of composite alumina tube to get good results.

5, Tungsten- rhenium thermocouples 1800 ℃ -2000 ℃ high temperature application

At temperatures above 1800 ℃ under the conditions currently only uses tungsten rhenium thermocouples. I am using the BN insulation, sintered tungsten tube , successfully used in 1800 ℃ -2000 ℃ vacuum furnace, there are many users.

6,Tungsten- rhenium thermocouples liquid steel temperature measurement application < span style = "font-size: 12px">

Under vacuum conditions , the use of metal-ceramic protective tube (Φ10 × 140 ~ 190) tungsten rhenium thermocouple batch temperature of molten steel in-line measurement , in order to meet the needs of a vacuum metallurgical production process .


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Standardization of tungsten rhenium thermocouples are tungsten rhenium 3 - tungsten- rhenium 25 (D -type ) and tungsten rhenium 5 - tungsten rhenium 26 (C -type ) of two types, corresponding indexing are: tungsten rhenium 3 - tungsten and tungsten- rhenium 25 rhenium 5 - tungsten rhenium 26.

Tungsten- rhenium thermocouple wire quality performance standards described :

1 , Delivery specifications for diameter 0.1 ~ 0.5mm, diameter tolerance of ± 0.01mm;

2 , Even silk smooth surface, no oxidation, no bending, no glitches, mezzanine and splitting , allowing a small scratches , dents and a few spots ;

3 , According to the provisions sampling sampling test, the positive wire ( low rhenium ) and negative wire ( high rhenium ) at 1200 ℃ uneven thermal emf when no more than 80 microvolts (t0 = 0 ℃, namesake electrode method );

4 , At 20 ~ 30 ℃ ambient temperature , thermocouple wire diameter 5 times its own diameter shaft 5 laps wound surface without cracks, dual wire bent without breaking ;

5 , The temperature thermoelectric properties verification point : 100 ℃ (± 1 ℃), 1000 ℃ (± 10 ℃), 1200 ℃ (± 10 ℃), 1400 ℃ (± 10 ℃), 1600 ℃ (± 10 ℃), 2000 ℃ (± 10 ℃), or in consultation with users selected test temperature points ;

6 , Each batch furnaces have passed the type test .


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