MoSi2 Heating Element Service Life
MoSi2 heating element shows no change in its resistance when it is used continuously in air. Although silicon carbon rod will increase in resistance with the age, the resistance of molybdenum disilicide rod will not change at all. Therefore, the service life of heating element should last for many years in theory.
However, there are actually many other factors that will shorten the life of MoSi2 components, even under ideal conditions, it is more difficult to predict the life of components. Some of the more common factors for the life of MoSi2 elements include:
1. Products to be produced. For example, the service life for producing special glass is different from that used in the reflective material industry and the magnetic material industry. The magnetic material industry has the longest service life and special glass the shortest.
2. Product quality. The raw materials and manufacturing processes determine the product quality.
3. The quality of the furnace. Good quality of furnace may benefit the life of elements.
4. Surface problems. Working at a temperature of 1800 ℃ for a long time, the protective glaze layer can flake away when cycling the temperature, eventually eroding the element after many cycles.
5. Tolerance for diameters of hot zone and cold end. The dimensional accuracy of hot zone will directly affect the precise temperature control of the electric furnace. When there is a tolerance in the diameters, the cross-sectional area and resistance value will change. The calorific value of the electric heating component will also change accordingly. 0.1mm diameter tolerance means 7% of the calorific value after calculation. This means that the uniformity of the electric furnace or the service life of the electric heating components will be greatly affected.
6. Operators. Overheat, control failures and over power will cause the failure of heating element.
7. Product contamination. Product or atmosphere reacts with the protective glaze causing deterioration of the element.
8. Insulation issues. Elements too tight in insulation, insulation shifts and breaks the element, or elements contact the insulation and overheat.
9. Mechanical forces. Hot elements soften and can distort depending how they are oriented in a furnace.
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