There are many types of new energy kilns, and their uses are also different. Therefore, in the selection of electric furnace wires, different resistance furnaces are required to match suitable electric furnace wires. According to the material classification, the commonly used electric furnace wires include iron-chromium-aluminum alloy electric furnace wires and nickel-chromium alloy electric furnace wires. The former is an alloy material with ferrite structure, and the latter is an alloy material with austenite structure. In addition, there are some special-purpose electric heating alloy wires such as tungsten wire, molybdenum wire and other box-type resistance furnaces. According to different uses and different temperatures, different electric furnace wires can be selected.
1. Feature of iron-chromium-aluminum electric furnace wire electric heating alloy material for box-type resistance furnace:
1. The use temperature is high. For example, the maximum use temperature of HRE iron-chromium-aluminum alloy wire in the atmosphere can reach 1400°C, that is, the maximum temperature of the box-type resistance furnace can reach 1400 degrees. If you need to design a box-type resistance furnace that exceeds this temperature, You need to choose other electric stove wires;
2. Long service life;
3. The allowable surface load is large;
4. Good oxidation resistance. The AI2O3 film formed after oxidation has good chemical resistance and high resistivity, and its specific gravity is less than that of nickel-chromium alloy and high resistivity;
5. Good sulfur resistance;
6. The price is significantly lower than that of nickel-chromium alloys;
7. The disadvantage is that as the temperature increases, the performance is plastic, and the strength at high temperature is low.
2. Features of box-type resistance furnace nickel-chromium electric furnace wire:
1. High strength under high temperature;
2. Cool down after long-term use, the material will not become brittle;
3. The emissivity of fully oxidized nickel-ming alloy is higher than that of iron-chromium-aluminum alloy;
4. Non-magnetic;
5. In addition to sulfur atmosphere, it has better corrosion resistance.
3. Disadvantages of box-type electric furnace alloy electric furnace wire:
Alloy electric furnace wire is the most widely used and the largest amount of heating material. Its disadvantage is that it is at a very high temperature (hot state) under working conditions, and it is prone to oxidation reaction and burn out in the air; from the perspective of electrothermal energy conversion, the energy is lost due to the generation of visible light; electric furnace filaments are often When used in a spiral state, an inductive reactance effect will be generated when power is applied.
