Dispersion strengthening platinum/rhodium13-platinum thermocouple wires and production method thereof

Abstract

The invention discloses dispersion strengthening platinum / rhodium13-platinum thermocouple wires, comprising a cathode and an anode; the thermocouple wires are characterized in that the anode contain ingredients according to the following weight percentage: 12.87-13% of rhodium; 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the excess is platinum; the cathode contains ingredients according to the following weight percentage: 0-0.5% of zirconium; 0-0.5% of yttrium; 0-0.5% of calcium; 0-0.5% of lanthanum; 0-0.5% of titanium; the allowance platinum. The production method of dispersion strengthening platinum / rhodium13-platinum thermocouple wires comprise mixing ingredients, vacuum melting, placing and rolling, oxidizing, combined machining and drawing forming. The dispersion strengthening platinum / rhodium13-platinum thermocouple wires of the invention enjoy long service life, high adaptive temperature, strong contamination resistance and low use cost.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a dispersion strengthened platinum rhodium 13 -Platinum thermocouple wire and its production method. Background technique [0002] Thermocouple wires are used to make various temperature measuring elements, and are widely used in temperature measurement in various fields such as the steel industry and the glass industry. Platinum rhodium is generally used in large quantities in the prior art 13 - Platinum thermocouple wire with a positive platinum rhodium 13 The nominal composition is rhodium Rh13%, platinum Pt is the balance, and the nominal platinum content of the negative electrode is 100%. This kind of thermocouple wire can be used under high-temperature oxidation conditions, and the temperature can be measured in the temperature range of 300-1400°C. However, the platinum pole grains of this kind of thermocouple wire are easy to coarsen, and the anti-pollution abili...

AI Technical Summary

Problems solved by technology

This kind of thermocouple wire can be used under high-temperature oxidation conditions, and the temperature can be measured in the temperature range of 300-1400°C. However, the platinum pole grains of this kind of thermocouple wire are easy to coarsen, and the anti-pollution ability is poor, causing the thermoelectric potential to be unstable. , shorter service life, higher cost