Classification and comparison of the types of heating wires
The types of heating wires are classified according to their chemical element content and organizational structure. There are iron-chromium-aluminum alloy heating wires and nickel-chromium alloy heating wires. These two heating wires are used as heating elements and have different functional characteristics.
Advantages and disadvantages of iron-chromium-aluminum alloy heating wire
The advantage of the iron-chromium-aluminum alloy heating wire is its high operating temperature. The experiment shows that the higher operating temperature of the iron-chromium-aluminum alloy heating wire can reach 1400°C. The iron-chromium-aluminum alloy heating wire has long service life, high resistivity, high surface compounding, and good oxidation resistance.
The disadvantage of the iron-chromium-aluminum alloy heating wire is its low strength in high temperature environments. As the temperature increases, the plasticity of the iron-chromium-aluminum alloy heating wire will increase, which means that the iron-chromium-aluminum alloy heating wire is prone to deformation at high temperatures. And it is not easy to repair after deformation.
Advantages and disadvantages of nickel-chromium alloy heating wire
The advantages of nickel-chromium alloy heating wire are high strength in high temperature environment, long-term high temperature operation is not easy to deform, and it is not easy to change the structure, and the nickel-chromium alloy heating wire has good normal temperature plasticity, and the repair after deformation is relatively simple. In addition, the nickel-chromium alloy heating wire has high emissivity, non-magnetic, good corrosion resistance and long service life.
The disadvantage of nickel-chromium alloy heating wire is that the operating temperature cannot reach the level of the previous heating wire. The manufacture of nickel-chromium alloy heating wires requires the use of nickel. The price of this metal is higher than that of iron, chromium and aluminum. Therefore, the manufacturing cost of nickel-chromium alloy heating wires is relatively high, which is not conducive to cost control.