High-adaptability low-cost nickel chromium-nickel silicon thermocouple wire and production process thereof

Abstract

The invention provides a high-adaptability low-cost nickel chromium-nickel silicon thermocouple wire. The nickel chromium-nickel silicon thermocouple wire comprises a positive electrode thermocouple wire and a negative electrode thermocouple wire, and is characterized in that the negative electrode thermocouple wire is a nickel-based alloy wire, and the nickel-based alloy wire comprises the following components of, in percentage by weight, 0.3-1.0% of cobalt, 0.05-0.2% of yttrium, 0.1-0.5% of vanadium, 0.5-2.0% of titanium, 1.0-2.0% of iron, 2.0-3.0% of aluminum, 0.05-0.2% of niobium, 0.05-0.2% of molybdenum, 6.5-8.5% of chromium, 0.5-1.3% of vanadium, 0.5-1.3% of tungsten, 2.0-3.0% of manganese, 0.05-0.2% of gallium, 0.5-1.0% of silicon and the balance nickel. The alloy wire is prepared through smelting, refining and other operations, and the thermocouple wire is high in test precision and wide in applicability.

Description

technical field [0001] The invention belongs to the field of thermocouple wire preparation, and in particular relates to a high-adaptability and low-cost nickel-chromium-nickel-silicon thermocouple wire and a production process thereof. Background technique [0002] Nickel-chromium-nickel-silicon thermocouple wire (K-type thermocouple wire) is currently the most used base metal thermocouple wire in the temperature measurement area above 500 °C, and its consumption is the sum of other metal thermocouple wires. The nominal chemical composition of the positive electrode (KP) of nickel-chromium-nickel-silicon thermocouple wire is: Ni:Cr≈90:10, the chemical composition of the negative electrode (KN) is: Ni:Si≈97:3, and its operating temperature range is - 200~1300℃. K-type thermocouple wire has the advantages of good linearity, large thermal electromotive force, high sensitivity, good stability and uniformity, strong oxidation resistance, and low price, and can be used in oxidiz...

AI Technical Summary

Problems solved by technology

However, K-type thermocouples cannot be directly used in sulfur, reducing or reducing and oxidizing atmospheres and vacuums at high temperatures, and are not recommended for use in weak oxidizing atmospheres.

[0003] Patent CN201810397675.2 discloses a safe and stable low-temperature thermocouple wire made of nickel, titanium, gold, iron, aluminum, niobium, molybdenum, chromium and vanadium, which has high strength, good toughness, good low-temperature transformation and good conductivity , high measurement accuracy, but there are still problems of high production cost and poor adaptability

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