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Tungsten-rhenium thermocouple not only has a high upper temperature limit, but also has good stability
2012-4-9 11:19:07

是1930年由戈德克(GoedecKe)首先研制出来的,是测至1800℃以上的工业热电偶中性能最佳的热电偶。 Tungsten-rhenium thermocouple was first developed by GoedecKe in 1930. It is the best performing thermocouple among industrial thermocouples measured above 1800 ° C. At present, the products of American Hoskins company and Ari company solid type anti-oxidation tungsten rhenium thermocouple (protection tube: the outer protection tube is cermet is used at a temperature of 1600 ° C. It is mainly used in harsh environments such as coal gasifiers and vulcanization furnaces. S-type or other low-gold thermocouples are not suitable for use in H2S or SO2 containing) technology leading internationally.

采用实体型结构(专利技术,专利号: 92210122)解决了钨铼热电偶高温抗氧化问题。 Our company's anti-oxidation tungsten rhenium thermocouple adopts a solid structure (patent technology, patent number: 92210122) to solve the problem of high temperature oxidation resistance of tungsten rhenium thermocouple. It is characterized by high temperature resistance and oxidation resistance. It can be used in oxidation, reduction or alternate atmosphere, and it is cheap, only 1 / 2-1 / 4 of platinum rhodium couple. The solid type anti-oxidation tungsten rhenium thermocouple is mainly used for temperature measurement in furnaces, metallurgy, chemical industry, refractory materials, coal gasification furnaces or sulfur recovery devices. 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 inexpensive 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 are 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.

抗氧化问题一直是国内外学者所关注的课题,并致力于研究解决。 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.