Preparation of nickel resistance wire and its resistance temperature characteristics

Preparation of nickel resistance wire and its resistance temperature characteristics

Thermal resistance sensors have the characteristics of large temperature measurement range, high accuracy, stable performance, and good repeatability. They are an ideal temperature detection element and are widely used in the collection of atmospheric temperature and fuel oil temperature in aircraft engines.

Different applications of high-efficiency resistance wires

According to their respective characteristics, they are used in different environments and temperature ranges. Generally speaking, platinum resistors have the characteristics of high temperature measurement accuracy, stable and reliable chemical performance, and wide temperature measurement range. They can be used as standard resistance thermometers and are widely used in industrial measurements. They are currently the most reproducible type of temperature measurement. For industrial applications, especially at lower temperature conditions, nickel resistors can partially replace platinum resistors and have broad application prospects. In general, the chemical properties of nickel wire are relatively stable and do not interact with elements such as oxygen and chlorine. Nickel wire can also generate a dense layer of nickel oxide on the surface, which has a protective effect. Nickel wire has good weldability and low price.

Composition of nickel resistance wire

The resistance of metals and alloys increases with temperature, but the temperature coefficient of resistance is generally higher for high-purity metals and rare alloys. Nickel resistance wires for temperature measurement are generally made of pure nickel, which has high stability. The temperature coefficient of the alloy resistance is adjusted by adding a small amount of alloy elements.

Preparation process of nickel resistance wire

The preparation process of nickel resistance alloy wire mainly adopts vacuum melting and electroslag remelting, followed by hot forging of the alloy ingot, fine polishing of the billet, and then hot rolling processing. After heat treatment of the hot-rolled coil, repeated drawing and hydrogen protection heat treatment annealing are carried out until the finished micro wire is pulled, and then hydrogen protection heat treatment annealing is carried out.

In the absence of industrial nickel resistance and nickel resistance wire standards in China, a nickel resistance wire for a temperature sensor was successfully developed by adjusting the trace element composition of nickel dilute alloy multiple times and adopting appropriate heat treatment processes. Experiments have shown that the resistance temperature coefficient of the developed nickel resistance wire material α = 0.005 86/℃, meeting usage requirements, stable wire performance, suitable for preparing airborne nickel resistance temperature sensors.

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