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...

 Shandong Huaxin Electric Furnace Co., Ltd.   not only provides customers with high-quality products but also provides comprehensive product after-sales service and consultation on production operations. Before the medium frequency furnace is used, the induction coil of the medium frequency furnace needs to be knotted, that is, the lining is knotted. After the lining is knotted, the oven is carried out. At this time, abnormal noise will sometimes occur. One of the reasons is that the temperature is not raised according to the oven process, and the temperature is too fast, and the furnace lining thermally expands and bursts, which makes noise. The general idea to solve the problem is to reduce the heating rate and strictly implement the oven process. Secondly, the inductor coil of the medium frequency electric furnace is not well insulated, which will cause inter-turn ignition and abnormal noise. The solution is to handle the insulation. In addition, if there is debris...

  　　 The inductor of the medium frequency diathermy furnace is designed according to the length of the heated workpiece and the diameter of the workpiece, so the inductor has lengths and shorts. But in general, the medium frequency diathermy inductor is generally relatively long (referring to the axial direction of the heated workpiece), and its purpose is to ensure that the heating temperature and the temperature difference between the core and the surface meet the requirements under the condition of the heating workpiece tempo unchanged. There are basically two types of lining assembly for medium frequency heating inductors, one is knotted lining, and the other is assembled lining. Whether it is knotted lining or fabricated lining, long-term work under high temperature will change (mainly thermal expansion and contraction and oxidation). If used improperly, the heating material will collide and squeeze the furnace lining phenomenon, so the use of the furnace lining has a certa...

  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...