The effect of refractory materials and thermal insulation materials on electric heating alloys

The effect of refractory materials and thermal insulation materials on electric heating alloys

In the industrial electric furnace, in order to install the electric heating element and prevent it from deforming at high temperature, it is necessary to use the backing and supporting parts made of refractory materials. Some electric heating elements of household appliances are directly processed in powdered oxide. At this time, the surface of the electric heating alloy will be in direct contact with the refractory material, and physical and chemical reactions will occur at high temperatures, which will corrode the electric heating element. Insulation material is an important material to reduce heat loss. In special circumstances, the contact of the insulation material with the electric heating element will also harm the electric heating element.

A large amount of corrosive gases are released from ceramics and their glaze during the heating process of ceramic furnaces that use electric heating. These gases cause strong corrosion to electric heating elements and shorten the service life of electric heating elements. Today, Xiao Ye will introduce to you the process of furnace gas on electric heating elements and how to choose the electric heating alloys for firing ceramic furnaces reasonably: The ingredients of ceramics and glazes contain BaCl2, KCl, K2CO3, NaNO3, MgSO4, CaSO4 , FeS, etc. The firing temperature is as high as 1300°C, and different types of chemical reactions will occur at different stages of the firing process. Therefore, the composition of the furnace gas for firing ceramic products is more complicated. The following briefly describes the composition of the furnace gas and its effect on the heating element.

Since the temperature in the ceramic furnace is as high as 1300°C, and the furnace gas contains corrosive gas, the alloy is also required to have better corrosion resistance. At present, the following grades of iron-chromium-aluminum alloys can be used to fire electric heating elements of ceramic furnaces: 0Cr26A17.5, 0Cr27AI7Mo2, 0Cr24Al6R, Cr23AI6, Cr22Al6 containing cobalt and rare earths, and iron-chromium-aluminum alloys made by powder metallurgy.

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