Iron-chromium-aluminium alloys ( FeCrAl ) are alloys containing high amounts of the elements chromium and aluminium, which offer a variety of unique advantages that meet specific application needs and make them ideal for use in certain fields. Below are the main features, functions and areas of application of FeCrAl alloys:
Unique advantages
1. High application temperatures: FeCrAl alloys are able to withstand temperatures up to 1400°C in air, which is higher than the temperatures that NiCr electric heating wires can withstand.
2. Long service life: at the same operating temperature, the service life of FeCrAl alloy can be 2 to 4 times longer than that of NiCr alloy.
3. High surface loading capacity: Due to its higher permissible operating temperature and longer life, it is able to withstand higher surface loads, contributing to rapid heating and material savings.
4. Excellent oxidation resistance: The aluminium oxide (Al2O3) film formed on the surface is dense and does not easily come off, providing good oxidation protection, while the nitriding resistance is superior to that of chromium oxide (Cr2O3) on NiCr heater wires.
5. Low Density: Compared to Nichrome, Ferrochrome Aluminium alloys are less dense, which means that material can be saved in the manufacture of components of the same size.
6. High resistivity: The high resistivity of FeCrAl alloys not only helps to efficiently convert electrical energy into heat, but also reduces the amount of material used.
7. Good sulphur resistance: For sulphur-containing environments or surfaces contaminated with sulphur, FeCrAl alloys show good corrosion resistance.
8. Cost-effectiveness: The absence of the rare metal nickel makes it relatively inexpensive.
Needs met
Iron-chromium-aluminium alloy was developed to meet the needs of electric heating elements that require stable operation in high-temperature environments. It is particularly suitable for industrial applications that require high efficiency, long life and low cost.
Function
- Efficient conversion of electrical energy into thermal energy
- Maintains structural stability and mechanical strength at high temperatures
- Resistant to chemical attack in harsh environments
Fields of application
Industrial electric furnaces: used as heating elements in various types of industrial furnaces, such as melting furnaces, annealing furnaces, etc.
Household appliances: e.g. ovens, heaters and other portable household electric heating appliances.
Far infrared devices: utilising their highly efficient heat radiation properties.
Nuclear engineering: potential applications in nuclear reactor components due to its excellent high temperature oxidation resistance and mechanical strength.
Additive manufacturing (3D printing): particularly in the manufacture of components requiring good high-temperature properties.
