What are the changes after the electric heating tube electric furnace wire is electrified and heated
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What are the changes after the electric heating tube electric furnace wire is electrified and heated
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 dilute 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 square billets of alloy ingots, fine grinding of the square billets, and then hot rolling processing. After heat treatment of hot rolled wire rods, repeated wire 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, nickel resistance wire for a temperature sensor was successfully developed by repeatedly adjusting the trace element composition of nickel alloy and adopting appropriate heat treatment processes. The experiment shows 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. Since the beginning of the 21st century, a new type of electric heating wire has emerged - carbon fiber electric heating wire. The following are the performance parameters of the electric heating wire:
Single wire diameter 7.0-10 μ M
Tensile strength 3.6-3.8GPa
Elongation modulus 220-240GPa
Carbon content ≥ 95%
Elongation rate 1.5%
Density 1.6-1.76 g/cm3
Appearance gray black
Volume resistivity 1.5 × 10- ³ Ω cm
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