Tungsten-Rhenium Thermocouples on The Air at High Temperature Thermoelectric Stability of The Conclusions of The Study

Explores the tungsten rhenium thermocouples thermoelectric air at high temperature stability, regularity conclusions drawn as follows:

(1) Tungsten rhenium thermocouple in the air, due to high temperature oxidation, causing mutations cause thermocouple thermoelectric power failure. Among them, at 1000 ℃, thermopower negative drift occurs; 800 ℃ and 900 ℃, thermopower positive drift occurs.

(2) Tungsten-rhenium thermocouples stability of each pole is different: 1000 ℃ positive instability occurs first thermopower negative drift; 800 ℃ and 900 ℃, the negative instability occurs first thermopower negative drift.

(3) Tungsten-rhenium thermocouples thermal emf sudden failure reasons, not due to selective oxidation of alloying elements, but because of a pole alloy wire is completely oxidized to oxides, the nature of the material has undergone a fundamental change. 1000 ℃, because of its positive completely oxidized tungsten rhenium thermocouples cause sudden failure; 800 ℃ and 900 ℃, it is negative.

(4) Tungsten-rhenium thermocouples sudden failure, thermoelectric power and volume resistivity of both mutations. Thus, the resistance measurement can predict its life.

(5) After failure of tungsten rhenium thermocouple thermoelectric power is still the illusion, which is its oxidation products with high conductivity rhenium oxide sake.


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