Silicon molybdenum rod technology and its production

U-shaped silicon-molybdenum rod is the most commonly used specification among silicon-molybdenum rod electric heating elements. In electric heating equipment, the element is suspended and installed vertically by supporting chucks to avoid adding mechanical stress to the heating end of the element, otherwise it is easy to cause the element to break .

Continuous work: The silicon molybdenum rod works continuously at high temperature for a long time, and the surface film gradually evaporates, so that the rod body undergoes thermodynamic phase equilibrium from the inside to the surface. When the concentration gradient of surface silicon is not enough to form the lowest silicide phase, free molybdenum occurs Oxidation and volatilization of the new molybdenum silicide interface will form a quartz glass protective film. In this way, the volatilization and film formation will continue to reduce the size of the components until the local minimum cross-section is overloaded and burned to failure. This is mainly the failure form of silicon molybdenum rods in continuous kilns. (Guide: Grinding technology affects the rapid development of machine tool industry)

Interstitial work: The quartz glass film on the surface of the silicon molybdenum rod is cracked, collapsed, and thinned due to thermal expansion and contraction during the thermal stress process of heating and cooling, and it re-forms protection on the new surface of the cracks and collapses. In the film, there is a pit lower than the surface of the element. After a certain number of alternations, the surface of the element forms a continuous pitted surface with a diameter of 1 to 2 mm and a depth of 0.2 to 0.5 mm, and finally burns at the smallest cross-section. This is mainly the failure form of the gap furnace.

The silicon molybdenum rod heating element is a special molybdenum disilicide high temperature conductive ceramic product, and it is the only silicide ceramic used in a large number of applications. The components are hard and brittle at room temperature, and cannot be bumped or twisted during transportation and installation. However, it starts to soften at 1350℃ and is easy to creep. Generally, it is installed vertically. When the electric furnace is drying or heating up, you should contact as soon as possible: One, three, three, two, two, and zero, there is a business fee.

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