How does the resistance of a silicon carbide component change after a period of use?
2026-04-10
Silicon Carbide Rods (such as Silicon Carbide Rods) exhibit a gradual increase in resistance over time, a phenomenon known as “aging.”
Silicon Carbide Rods (such as Silicon Carbide Rods) exhibit a gradual increase in resistance over time, a phenomenon known as “aging.” This aging process is primarily caused by oxidation reactions on the material’s surface under high-temperature conditions. The resulting silicon dioxide protective layer can slow down further oxidation, but it gradually thickens, leading to a slow rise in resistance. Moreover, prolonged exposure to high temperatures may induce changes in the material’s internal crystal lattice structure, further exacerbating the increase in resistance.
Experimental data show that domestically produced Silicon Carbide Rods may experience a 15% to 20% increase in resistance after 60 to 80 hours of continuous operation, with the rate of increase gradually slowing thereafter. When the resistance rises to 3 to 4 times its initial value, the component is generally considered to have reached the end of its service life. Aging significantly affects equipment performance: under constant voltage conditions, an increase in resistance leads to a decrease in current and, consequently, a reduction in output power, potentially resulting in lower heating efficiency and unstable temperature control.
To slow down the aging process, it is essential to control the operating temperature (recommended not to exceed 1400°C), avoid frequent thermal cycling, and optimize the furnace atmosphere by minimizing corrosive components such as water vapor and alkaline substances. Regularly monitoring resistance trends enables early detection of component degradation, allowing for timely adjustments to power supply parameters or replacement of faulty components, thereby ensuring the long-term stable operation of the equipment.
Related Questions
Precautions for Using Silicon Carbide Rod
Before installing the Silicon Carbide Rod, first check the resistance (Ω) marked on the cold end, then perform resistance matching; the resistance variation within each group should be within ±0.1. After the rod passes through the holes on both sides (or top and bottom) of the furnace wall, it should be able to rotate freely through 360 degrees, and forced installation or hammering must be strictly avoided.
Use and precautions of Silicon Carbide Rod in the glass industry?
In a glass furnace, as the molten glass flows through the cooling and homogenizing sections, it should be uniformly cooled to a temperature suitable for forming. If no measures are taken, the sides of the feeder channel will lose heat more rapidly than the central region.
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