Characteristics of electrothermal materials

Time：2022-07-29

As the heat source that converts electric energy into heat energy, the electric heating element is required to reach the required temperature, and the material used to make the electric heating element is also required to have the following properties:
(1) High resistivity. When the current passing through the electric heating element is constant, the greater the resistance, the greater the power obtained, the more electric energy is converted into heat energy, and the faster the furnace temperature rises. Using high resistivity materials to process electric heating elements with short growth and large cross-section can not only save materials but also prolong the service life of electric heating elements.
(2) Small resistance temperature coefficient. Resistance temperature coefficient refers to the value of the resistance of electrothermal materials changing with temperature. The resistance of electric heating elements with positive resistance temperature coefficient increases gradually with the increase of temperature. Too large temperature coefficient is not conducive to the stability of heating power and is easy to cause temperature fluctuations.
(3) Good heat resistance and high strength under high temperature. The temperature of the electric heating element itself is higher than the normal working temperature of the furnace, with a general difference of 50~100 ℃. In order to prevent it from serious deformation, melting and fracture, the electric heating materials used should have good heat resistance and high temperature strength.
(4) The coefficient of linear expansion should be small. The electric heating element with large linear expansion coefficient will become thicker and longer when the temperature rises, which may damage the fixed element and cause the electric heating element to fall off or short circuit. Therefore, the electric heating material with small linear expansion coefficient should be selected.
(5) Good processability. When selecting electric heating element materials, its machinability should be considered, that is, it is convenient for processing and forming, winding and installation.

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