How to choose the heating element of the muffle furnace?

The heating element of the muffle furnace is generally a silicon carbide rod or a silicon molybdenum rod. The silicon molybdenum rod resistive heating element is a high temperature resistant and oxidation resistant resistance heating element made on the basis of molybdenum disilicide. When used in a high-temperature oxidizing atmosphere, a bright and dense quartz (SiO2) glass film is formed on the surface, which can protect the inner layer of the silicon molybdenum rod from oxidation. Therefore, the silicon molybdenum rod element has unique high-temperature oxidation resistance.

In an oxidizing atmosphere, the maximum operating temperature is 1800°C. The resistance of the silicon molybdenum rod heating element increases rapidly with the increase of temperature, and the resistance value is stable when the temperature does not change. Under normal circumstances, the resistance of the element does not change with the length of time of use. Therefore, the old and new silicon molybdenum rod electric heating elements can be mixed.

According to the structure, working atmosphere and temperature of the heating equipment, the correct selection of the surface load of the electric heating element is the key to the service life of the silicon molybdenum rod electric heating element.