Tungsten-Rhenium Thermocouple Materials

Tungsten-rhenium thermocouple is a high-temperature resistant thermocouple that can be used in the range of 0 to 2300°C in vacuum, reducing and inert atmospheres. It has the advantages of good temperature-potential linear relationship, reliable thermal stability and low price. The relationship between thermoelectric potential and temperature of tungsten-rhenium thermocouple conforms to the ZBN05003-88 scale, which is equivalent to ASTME696-84 standard. Its temperature measurement accuracy is ≤0.5% and its response time is less than 0.5s.

It can be matched with display instruments to directly measure the temperature of liquid, steam and gas media. If the tungsten-rhenium thermocouple is protected by a special protective tube, it can also be used for a long time in an oxidizing atmosphere at a high temperature of 1600°C.

It can partially replace platinum-rhodium thermocouple as an ultra-high temperature measurement tool for high-tech metallurgical industry, high-temperature electronic thermoelectric system structural engineering and space vehicles, and nuclear reactors.

Materials of tungsten-rhenium thermocouples. There are two types of tungsten-rhenium thermocouples listed in the national standards of my country:

Tungsten-rhenium 5-tungsten-rhenium 26, its positive electrode nominal composition is 95% tungsten and 5% rhenium, and the negative electrode nominal composition is 74% tungsten and 26% rhenium. The graduation number is WRe5-WRe26, abbreviated as: W-Re5/26 (ASTM graduation number: C).

Tungsten-rhenium 3-tungsten-rhenium 25, its positive electrode nominal composition is 97% tungsten and 3% rhenium, and the negative electrode nominal composition is 75% tungsten and 25% rhenium. The graduation number is WRe3-WRe25, abbreviated as: W-Re3/25 (ASTM graduation number: D).

The grading numbers of tungsten-rhenium thermocouples include W/(W-26Re), (W-3Re)/(W-25Re), (W-5Re)/(W-26Re) and (W-5Re)/(W-20Re).