Silicon carbide far-infrared electric heater is a radiation typeheater. After power-on, it can form a strong broad-spectrum directional radiation in the vertical space, effectively converting electrical energy into far-infrared radiation energy, directly transferring it to the object to be dried, rapidly converting it into molecular thermal motion, drying from the inside out, achieving the purpose of rapid drying and setting, and achieving significant energy-saving effects. The silicon carbide far-infrared electric heating plate uses a silicon carbide plate coated with metal oxide (i.e., far-infrared coating) as the radiation element. Electric heating wires are installed in the holes (or grooves) of the element, and a thick layer of insulating, refractory, and heat-insulating material is placed at the bottom of the element. Then a metal shell is installed, and wiring terminals are connected for power-on use. Silicon carbide has a room temperature flexural strength of 45 MPa, a high-temperature flexural strength of 50 MPa at 1000°C, a bulk density of 2.7-2.75 g/cm³, a thermal expansion rate of 0.42-0.48% at 900°C, and a thermal conductivity (at 350°C) of 10.3-16.7 W/m·K.
When far-infrared radiation radiates onto an object, absorption, reflection, and transmission can occur. The heated and dried material absorbs far-infrared radiation energy at a certain depth inside and on the surface molecules simultaneously, generating a self-heating effect, causing the solvent or water molecules to evaporate, with uniform heating, thereby avoiding deformation and quality change caused by different thermal expansion degrees, keeping the appearance, physical and mechanical properties, fastness, and color of the material intact. Widely used in automobiles, textiles, printing and dyeing, dyes, papermaking, bicycles, refrigerators, washing machines, chemical fibers, ceramics, electrostatic spraying, grain, food, pharmaceuticals, chemicals, tobacco and other industries, achieving ultra-fast drying purposes. It has the advantages of good radiation effect, significant power saving, and convenient use and maintenance, especially suitable for large drying rooms, ovens, and conveyor drying tunnels.
