Induction Vacuum Melting Furnace

Melting is carried out under vacuum or protective atmosphere conditions. The primary purpose of Induction Vacuum Melting Furnace is to produce high-purity, high-performance special alloys.

The Induction Vacuum Melting Furnace creates a melting environment under vacuum or inert gas protection. This is not merely a protective measure but a refining method. By utilizing the difference in gas partial pressures under vacuum, harmful gases such as hydrogen, oxygen, and nitrogen dissolved in the molten metal are spontaneously released, while low-boiling-point impurities such as lead, zinc, and bismuth are volatilized and removed. This achieves a level of deep purification that is unattainable in atmospheric melting.

The Induction Vacuum Melting Furnace serves high-precision and high-technology fields such as aerospace, nuclear power, energy, and the chemical industry. For example, single-crystal superalloys used in aircraft engine turbine blades contain multiple highly oxidizable elements such as aluminum, titanium, and hafnium. The vacuum environment can control the burn-off rate of these elements to within one percent, ensuring that the alloy composition is precise to two decimal places. In the nuclear power sector, corrosion-resistant alloys have extremely stringent requirements for carbon content (typically requiring no more than 0.02%), and vacuum melting avoids the carbon pickup problem associated with graphite electrodes in traditional processes. As another example, the rare earth elements neodymium and dysprosium in NdFeB permanent magnets are chemically highly reactive. Atmospheric melting would form a large number of oxide inclusions, leading to a significant decline in magnetic properties.

The furnace body system is complex, comprising a double-layer water-cooled shell, vacuum pump units, sealing mechanisms, and other components to maintain the melting environment-either high vacuum or inert gas protection.

The advantages of Induction Vacuum Melting Furnace are manifested in two aspects: purity and precision. The efficiency of degassing and impurity removal is extremely high-the removal rate of hydrogen can reach over 90%, while oxygen and nitrogen can be reduced by 50% to 70%. Electromagnetic stirring ensures a uniform temperature distribution in the molten bath, with temperature differences not exceeding ±5°C. Combined with the vacuum secondary charging system, volatile elements or trace strengthening elements can be precisely added during the late refining stage, achieving closed-loop composition control. At the same time, because oxidation burn-off and electrode contamination are avoided, the recovery rate of precious metals and rare elements can be increased by 5% to 10%, which is of great significance for high-value materials.

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