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SIC heating elements
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SIC heating elements are resistant to high temperatures, oxidation, corrosion, fast heating, long life, small deformation at high temperatures, and easy installation and maintenance. They also have good chemical stability, are hard and brittle, and resistant to rapid cooling and heating, and are not easily deformed at high temperatures.
Matching with the automatic electric control system, it can obtain accurate constant temperature, and can automatically adjust the temperature according the required by the production process.
Heating with SIC heating elements is both convenient and safe and reliable. It has been widely used in high-temperature fields such as electronics, magnetic materials, powder metallurgy, ceramics, glass, semiconductors, analysis and testing, scientific research, and has become an electric heating element for tunnel kilns, roller kilns, glass kilns, vacuum furnaces, muffle furnaces, smelting furnaces, and various heating equipment.
Selection of Load and Quantity of Silicon Carbon Rod
The load of silicon carbon rod refers to the power that the silicon carbon rod is allowed to withstand, which is determined by the load density of the silicon carbon rod. The load density refers to the maximum power allowed per unit heating area of the silicon carbon rod heating element, usually measured in W/cm2. The load density directly determines the load and number of rods, and the furnace temperature directly affects the load density.
The higher the furnace temperature, the smaller the load density. At the same furnace temperature, the higher the load density, the faster the aging of silicon carbide rods, making the selection of load density particularly important.
Selection of hot resistance
Silicon carbon rod is a pure resistive non-metallic electric heating element. Its resistance is different from that of metal electric heating elements. Its resistance is high in cold state and changes with the increase of temperature. 800℃ is the inflection point. Below 800℃ is negative resistance characteristic, and above 800℃ is positive resistance characteristic. Based on this resistance characteristic, the resistance value marked on the silicon carbon rod at the factory is the hot resistance value measured by voltammetry method at 1100℃. Therefore, silicon carbon rod can only be selected according to the hot resistance value. Practice has proved that the hot resistance should be selected on the upper side, rather than small. If the resistance of the heating element is small to a certain extent (the same order of magnitude as the cold end), the cold end will turn red, which is obviously unfavorable. It will not only burn out the furnace wall and consume unnecessary electricity, but also naturally increase the actual heating time of the silicon carbide rod and shorten its service life.
Selection of silicon carbon rod models and specifications
Silicon carbon rod models refer to 3-section rods, 5-section rods, U-shaped rods, H-shaped rods and gun-shaped rods. Simply put, 5-section rods should be used for occasions with high homogenization requirements, and 3-section rods should be used otherwise; H-shaped rods or U-shaped rods should be used when single-end wiring is required; Gun-shaped rods are used for material basins. The specifications of silicon carbon rods refer to diameter, heating area length, cold end length, bridge length, center distance, etc. For straight rods (3-section rods and 5-section rods), the cold end length depends on the thickness of the furnace wall; The length of the heating element must correspond to the width of the liquid tank, and is generally not less than the width of the liquid tank.
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