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Our company successfully developed tungsten-rhenium thermocouples using international advanced manufacturing technology
2012-3-16 10:21:47

是1931年由Goedecke(戈徳克)首先研制出来的,在60至70年代得以发展的最成功的难熔金属热电偶。 Tungsten-rhenium thermocouple was first developed by Goedecke in 1931, and was the most successful refractory metal thermocouple developed in the 1960s and 1970s. Tungsten-rhenium thermocouples are characterized by a high melting point of the hot electrode wire (3300 ° C), low vapor pressure, and easy oxidation, and good chemical stability in a non-oxidizing atmosphere. Large electromotive force and high sensitivity, the main thing is cheap.
1, the classification of tungsten rhenium thermocouple. There are two types of tungsten-rhenium thermocouples listed in national standards in China:
Thallium A, tungsten thorium 5-tungsten thorium 26, the nominal composition of the positive electrode is 95% tungsten, thorium 5%, and the nominal component of the negative electrode is 74% tungsten, thorium 26%. The division number is WRe5-WRe26, short for W-Re5 / 26.
Thorium B, tungsten thorium 3-tungsten thorium 25, the nominal composition of the positive electrode is 97% tungsten, 3% thorium, and the nominal composition of the negative electrode is 75% tungsten, 25% thorium. The division number is WRe3-WRe25, short for W-Re3 / 25.
2, the use of tungsten rhenium thermocouple. At present, when measuring temperatures above 1600 ° C, non-contact methods are often used. However, the error of this method is relatively large. If the contact method is used, the real temperature can be accurately measured. Among high-temperature thermocouples, precious metal thermocouples are expensive and the highest temperature can only be below 1800 ° C. Tungsten-rhenium thermocouples not only have high temperature measurement limits, but also good stability. Therefore, tungsten-rhenium thermocouples are used in metallurgy, building materials, and aerospace , Aviation and nuclear energy industries are widely used. China has abundant tungsten resources. Tungsten-rhenium thermocouples are inexpensive and can partially replace precious metal thermocouples. It is a promising temperature measurement material in the field of high temperature testing.
3. Operating temperature. Its maximum operating temperature can reach 2800 ° C. However, when it is higher than 2300 ° C, the data is scattered. Therefore, the best use temperature is around 2000 ° C.
4. Use environmental atmosphere. Tungsten-rhenium thermocouples are extremely susceptible to oxidation and are suitable for use in inert or dry hydrogen, or they can be isolated from oxygen with a dense protective tube. Can not be used in carbon-containing atmosphere (such as in a hydrocarbon-containing atmosphere, the temperature exceeds 1000 ℃ will be corroded). Tungsten or tungsten thorium is easy to form stable carbides in a carbon-containing atmosphere, which reduces its sensitivity and causes brittle fracture. In the presence of hydrogen, it will accelerate carbonization.
5, tungsten rhenium thermocouple is resistant to oxidation. This problem has been a topic of concern to scholars at home and abroad, and is committed to research and solution. Our company has adopted the international advanced manufacturing process and successfully developed the assembled high temperature and high pressure W-Re thermocouple. The temperature measurement range of this product is 0 ~ 1800 ℃, which is widely used in metallurgy, coking, chemical furnaces, heat treatment, glass In other industries, it has the advantages of high accuracy, low price, stable performance, and is not restricted by the working environment atmosphere. It is an ideal product to replace platinum and rhodium thermocouples. The W-Re thermocouples produced by our company have been widely used in Zhuzhou Cemented Carbide Factory, Zigong Cemented Carbide Factory and Shenyang Zhongkeyi, and their performance has reached the level of similar foreign products. Its technical indicators are as follows:
1. Indexing number: W-Re3 / 25, W-Re5 / 26
2. Temperature measurement range: 0 ~ 1800 ℃
3. Temperature measurement accuracy: 5MΩ
6. Specifications: 300, 500, 750, 1000, 1100 (mm)
Tungsten-rhenium molten steel rapid temperature measurement thermocouple is specially designed for measuring the temperature of molten steel, molten iron and other metal melts. It has the advantages of high volume, high response speed, high accuracy, and low price. Its technical indicators are as follows:
1. Maximum temperature measurement temperature: 1800 ℃
2.Temperature measurement accuracy: ≤ 0.5% t
3.Insulation resistance: ≥30 MΩ
4.Measurement rate: ≥98%
5. Response time: <5 s
Special note: At present, the W-Re thermocouples produced by our company are divided into three types, one is a fine ceramic protection tube, the other is a pure molybdenum protection tube, and the other is a tungsten protection tube. The specifications of the ceramic tube are: diameter Ф8, Ф10, Ф12, Ф14, Ф16, and length 300 ~ 1100mm. This type of thermocouple can be used in any atmosphere for a long time without being restricted by the working environment atmosphere. The temperature measurement range is 0 ~ 1800 ° C. The specifications of molybdenum tube and tungsten tube are: diameter of Ф6, Ф8, Ф10mm and length of 500 ~ 700mm. This type of thermocouple can only work for a long time in an environment protected by vacuum, reduction or inert gas. Molybdenum tube is best at 1800 Long-term use at a temperature below ℃, the short-term use temperature can reach 2000 ℃; as for tungsten tube, it can work at 2100 ℃ for a long time, but it is difficult to process and makes it very expensive

的特点是:热电极丝熔点高(3300℃),蒸气压低,极易氧化;在非氧化性气氛中化学稳定性好。 Tungsten-rhenium thermocouples are characterized by a high melting point of the hot electrode wire (3300 ° C), low vapor pressure, and easy oxidation, and good chemical stability in a non-oxidizing atmosphere. Large electromotive force and high sensitivity, the main thing is cheap.
At present, when measuring temperatures above 1600 ° C, non-contact methods are often used. However, the error of this method is relatively large. If the contact method is used, the real temperature can be accurately measured. Among high-temperature thermocouples, precious metal thermocouples are expensive and the highest temperature can only be below 1800 ° C. Tungsten-rhenium thermocouples not only have high temperature measurement limits, but also good stability. Therefore, tungsten-rhenium thermocouples are used in metallurgy, building materials, and aerospace , Aviation and nuclear energy industries are widely used. China is rich in tungsten resources. Tungsten-rhenium thermocouples are cheap and can partially replace precious metal thermocouples (platinum-rhodium thermocouples). It is a promising temperature measurement material in the field of high temperature testing.
Its maximum operating temperature can reach 2800 ° C. However, when it is higher than 2300 ° C, the data is scattered. Therefore, the best use temperature is around 2000 ° C.
Tungsten-rhenium thermocouples are extremely susceptible to oxidation and are suitable for use in inert or dry hydrogen, or they can be isolated from oxygen with a dense protective tube. Can not be used in carbon-containing atmosphere (such as in a hydrocarbon-containing atmosphere, the temperature exceeds 1000 ℃ will be corroded). Tungsten or tungsten thorium is easy to form stable carbides in a carbon-containing atmosphere, which reduces its sensitivity and causes brittle fracture. In the presence of hydrogen, it will accelerate carbonization.
The anti-oxidation problem of tungsten-rhenium thermocouples has always been a topic of concern to scholars at home and abroad, and is committed to research and solution. Our company has adopted the international advanced manufacturing process and successfully developed the assembled high temperature and high pressure tungsten rhenium thermocouple. The temperature range of this product is 0 ~ 1800 ℃, which is widely used in metallurgy, coking, chemical furnaces, heat treatment, glass, etc. Industry, it has the advantages of high accuracy, low price, stable performance, and is not restricted by the working environment atmosphere. It is an ideal product to replace platinum and rhodium thermocouples. The tungsten-rhenium thermocouple produced by our company has been widely used in many units, and its performance has reached the level of similar foreign products. Its technical indicators are as follows:
1. Indexing number: W-Re3 / 25, W-Re5 / 26
2. Temperature measurement range: 0 ~ 1800 ℃
3. Temperature measurement accuracy: <± 1% t; <± 0.5% t
4. Time constant: ≥180 s
5. Insulation resistance:> 5MΩ
6. Specifications: 300, 500, 750, 1000, 1100 (mm)
Tungsten-rhenium molten steel rapid temperature measurement thermocouple is specially designed for measuring the temperature of molten steel, molten iron and other metal melts. It has the advantages of small size, fast thermal response, high accuracy, and low price. Its technical indicators are as follows:
1. Maximum temperature measurement temperature: 1800 ℃
2.Temperature measurement accuracy: ≤ 0.5%
3.Insulation resistance: ≥30 MΩ
4.Measurement rate: ≥98%
5. Response time: <5 s
分三类: At present, the tungsten-rhenium thermocouples produced by our company are divided into three categories:
The first type is a fine ceramic protection tube. The specifications of the ceramic tube are: diameter of Ф8, Ф10, Ф12, Ф14, Ф16, and length of 300 ~ 1100mm. This type of thermocouple can be long-term in any atmosphere without being restricted by the working environment For use, the temperature measurement range is 0 ~ 1800 ° C. Another type is pure molybdenum protection tube. Molybdenum tube and tungsten tube specifications are: diameter Ф6, Ф8, Ф10mm, length 500 ~ 700mm, this type of thermocouple can only For long-term work in an environment protected by reducing or inert gas, molybdenum tubes are best used for a long time at a temperature below 1800 ° C, and the short-term use temperature can reach 2000 ° C;
Another type is tungsten protection tube. As for tungsten tube, it can work at 2100 ℃ for a long time, but it is difficult to process and it is very expensive.
Please choose the thermocouple suitable for you according to our parameters