High Resistance Electric Heating Alloy
High resistance electric heating alloy is a kind of electric heating material that uses electricity as energy and converts it into heat energy. It is mainly composed of nickel-chromium alloy material, which can be divided into single-phase and double-phase. According to the chemical composition, it can be divided into NiCr and FeCr types, and can also be further divided into NiCr20 and NiCr20/C. Generally, NiCr alloys have good resistivity, heat resistance and oxidation resistance, and their electrical resistivity ratio can reach 10^-5 ohm-meter.
High resistance electric heating alloy is widely used in a variety of electric heating parts. For example, the electric heating tube of household electric water heater and the electric heating core of hair dryer are all made of high resistance electric heating alloy. In addition, this alloy can also be used as an industrial electric heater, with a wide range of uses.
Moreover, high resistance electric heating alloy is also widely used as a heating member in electronic components such as relays, electronic switches, thermistors and thermoelectric transistors. In addition, it can also be used in heating fabrics, electric hot water bottle, electric rug and electric blanket.
Due to the increasing demand for electric heating products in the market, high resistance electric heating alloy has become a common electric heating material, and its scope of application is also very extensive. However, due to the different properties of different alloys, users must choose the mychoice alloy to meet their requirements.
In general, high resistance electric heating alloys must meet the following requirements：
1) High electrical resistivity. The resistivity should be no less than 1*106 Ω/m for pure nickel-chromium alloy and no less than 0.2*106 Ω/m for Fe-Cr alloy.
2) High surface load. The surface load of electric heating alloy should not be lower than 16A/cm2.
3) High strength and plasticity. The tensile strength and plasticity of electric heating alloy should not be lower than 490MPa and 9%, respectively.
4) Good heat dissipation. The thermal conductivity of electric heating alloys should not be less than 1870W/m*K.
5) Low coefficient of thermal expansion. The coefficient of thermal expansion of electric heating alloy should not be higher than 9.3*10-6/K.
As a high-temperature electric heating material, high resistance electric heating alloy must meet the requirements of GB/T1234-1995 standard. During production and processing, the material should be subjected to thorough inspections and tests in order to ensure that the material meet the requirements of the standard.
High resistance electric heating alloy has strong ability to convert electricity into heat energy, and has wide application fields. Therefore, in the production and application of various electric heating products, high resistance electric heating alloy plays an irreplaceable role. Although there are many types of electric heating alloy on the market, we must guarantee the quality of the alloy we use. With the help of modern detection and analysis technology, we must ensure that the alloy meet the requirements of the standard before mass production and equip it with perfect quality assurance system so as to guarantee the safe and efficient use of electric heating alloys.
