Molybdenum Disilicide Heating Rod Basics

w type molybdenum disilicide heating rods
w type molybdenum disilicide heating rods

The molybdenum disilicide heating rod is a resistance heating component based on silicon and molybdenum, which can be heated to a high temperature in an oxidizing atmosphere. Its surface produces a dense quartz glass film that protects it from oxidation. Therefore, molybdenum disilicide has a unique high-temperature oxidation resistance, and its maximum temperature can reach 1800 ° C under an oxidizing atmosphere, and its applicable temperature is 500-1700 ° C. It can be used as a heating rod for industrial high-temperature furnaces such as ceramics, magnetic materials, glass, metallurgy, and refractory materials.

The mechanical properties of the molybdenum disilicide heating element are the same as those of other ceramic products, which are brittle materials which are easily broken at normal temperature, which makes it difficult to transport and install. But as long as it is properly installed and used properly, the breakage can be avoided.

Physicochemical properties of molybdenum disilicide heating rod

Physical properties

Bulk density  5.5-5.6g/cm3
Flexural strength  15-25kg/cm2
Vickers hardness  (HV) 570kg/mm2
Porosity  7.4%
Water absorption rate  1.2%
Thermal elongation  4%
u shaped molybdenum disilicide heating elements

Chemical properties  

Under high-temperature oxidizing atmosphere, a dense quartz protective layer is formed on the surface of the molybdenum disilicide heating element to prevent it from continuing to be oxidized. When the temperature is greater than 1700 ° C, the quartz protective layer (melting point of 1710 ° C) melts into droplets. When used in an oxidizing atmosphere, the quartz protective layer will be regenerated.

Electrical properties

The resistivity of the molybdenum disilicide heating rod increases rapidly with increasing temperature. Under normal operating conditions, the component resistance generally does not vary with the length of time of use. Therefore, new and old components can be mixed.

Application field

Mainly used in industrial heat treatment furnaces, sintering furnaces, foundry furnaces, glass melting furnaces, smelting furnaces, laboratory furnaces, test equipment and high-temperature sintering furnaces, etc.

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