Tungsten-rhenium wire: used to make tungsten-rhenium thermocouple and fast coupling head, tie wire generated by sapphire, electrode of large laser, also used to make high-performance filament, cathode of electron tube, etc.
Tungsten-rhenium thermocouple wire melting point: 3120-3360℃, the highest can be used to 3000℃, it is the most high temperature resistant metal thermocouple. It has the advantages of good linear relation between temperature and electromotive force, reliable thermal stability and low price. With the display instrument supporting, can be directly measured temperature at present to measure the temperature of more than 1600℃, the use of non-contact method, but the error of this method is larger, such as contact rule can accurately measure the real temperature. In high temperature thermocouple, precious metal thermocouple (platinum-rhodium thermocouple) is expensive and the highest temperature can only be below 1800℃, while tungsten-rhenium thermocouple is not only high temperature limit, but also good stability, therefore, tungsten-rhenium thermocouple in metallurgy, building materials, aerospace, aviation and nuclear energy and other industries have been widely used. Its maximum operating temperature can reach 2800℃, however, above 2300℃, data dispersion. Tungsten-rhenium thermocouple is easily oxidized, so in vacuum, reducing, inert atmosphere, can be used in the range of 0 ~ 2300℃. Tungsten-rhenium couple with special protection tube can also be used in the oxidation atmosphere of 1600℃ for a long time, its price is lower than platinum-rhodium thermocouple, can not be used in the atmosphere containing carbon (such as in the atmosphere containing hydrocarbons, the temperature is more than 1200℃ is corroded).
Tungsten or tungsten-rhenium tends to form stable carbides in a carbon-containing atmosphere, resulting in reduced sensitivity and brittle fracture, and accelerated carbonization in the presence of hydrogen. Company specializing in the production of antioxidant tungsten-rhenium thermocouples, ideal temperature range of 0 ~ 1500 ℃, the structure of double layer or three layer (not used) protection tube, double tube structure of the external protecting tube of protection for the pure corundum tube, the protection pipe for molybdenum silicide, three of the casing outside the protection pipe for recrystallized silicon carbide or pure corundum tube, tube and the protection tube and double tube is the same, The filling material in the tube is high temperature insulating material (can be used for a long time below 1800℃), and then the cold end is sealed after vacuum (sealant can be used for a long time below 300℃), to ensure that there is no residual oxygen in the tube. The product is suitable for vacuum, reduction and other inert gas use (0 ~ 1650℃), the ideal temperature measurement in the oxidation atmosphere is 0 ~ 1500℃. Time constant: ≥180 s.
