Induction melting furnace(WhatsApp:008618853692119)

In industrial furnaces, especially in kilns that use unshaped refractory materials as the lining, lining spalling is one of the key factors that cause the kiln to stop and shorten the service life. In the following, an intermediate frequency induction furnace is taken as an example to analyze in detail the reasons for the spalling of the induction furnace lining and countermeasures. Analysis of the mechanism of lining spalling defects 1. Flaking off the furnace lining caused by water vapor At 100°C and standard atmospheric pressure, the specific volume of water is 0.00104344m3/kg (liquid), 1.6736m3/kg (steam). Therefore, the volume expands 1618 times after changing from water to water vapor. If the moisture content of the furnace lining material is too high or damp, the preforms and coil slurry are newly replaced and the moisture is not completely baked and drained. When the furnace lining is knotted and sintered, the excessive temperature rise will cause the crucible The...

  Refractory materials with a melting point higher than 1700°C for medium frequency furnaces are roughly classified into six categories: oxides, carbides, nitrides, sulfides, borides and chemical elements according to their chemical composition. In the medium frequency electric furnace, the chemical elements and carbides work under high temperature and oxidizing atmosphere, which are easily oxidized or dissolved in molten iron. Silicon carbide can be used to repair the tapping trough or feeding trough of the furnace, but it cannot be used as the lining material for induction furnaces due to its electrical conductivity. Sulfides, borides, etc. can be dissolved in or chemically react with molten iron, and are reduced by iron and carbon. They are not suitable for furnace lining materials. Among nitrides, silicon nitride (Si-3N4) and aluminum nitride, although they have good oxidation resistance, peeling resistance, and are not easily corroded by molten metal, they are expensive an...