What Are the Advantages of vacuum melting furnace？

Vacuum melting, casting and re-melting equipment have been implemented in huge numbers over the recent years mainly with an intention to try and eradicate impurities from the process wherever possible.
Vacuum induction melting (VIM) has some specific advantages including, gas elimination, chemical composition control, process control and more.

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Vacuum Induction Melting (VIM) stands out as a highly advantageous method for melting and refining metals and alloys. In this post, we will explore the key advantages of VIM, and discuss why it has become a preferred choice in the modern metallurgical industry.

Advantages of Vacuum Induction Melting

 High Purity and Quality

One of the most significant benefits of VIM is the ability to produce high-purity and high-quality materials. The vacuum environment eliminates the risk of contamination from oxygen, nitrogen, and other gases present in the atmosphere. This results in a cleaner and more homogeneous melt, free from harmful inclusions and impurities that could impact the material’s mechanical properties.

Controlled Atmosphere

In the vacuum chamber, the atmosphere is tightly controlled. Only specified gases are introduced at precise pressures. This level of control allows tight control over the chemical composition of the melted material and any reactivity. Unwanted oxidation or reactions with ambient gases are avoided.

High-Temperature Capability

Induction heating is very efficient and can generate the high temperatures required to melt most metals and alloys. The vacuum environment enhances temperature control and uniformity. The best we can do is ℃。

Rapid Melting and Cooling

The induction coils heat the metal charge extremely quickly, enabling rapid melting. After the power is shut off, the molten metal can be quickly cooled and solidified. This enables a high degree of control over the melting and solidification process. Rapid cooling, in particular, helps achieve unique microstructures and material properties.

Reduced Energy Consumption

The use of an induction furnace in VIM results in efficient energy transfer, as the magnetic field generated directly heats the metal. This makes the process more energy-efficient compared to other melting methods that rely on indirect heating, such as arc or resistance heating.

Wide Range of Applications

VIM can be employed for various industries and applications. It is widely used in the production of superalloys, stainless steels, and specialty metals for aerospace, medical, automotive, and energy industries. The process is also suitable for the production of advanced materials, such as intermetallic compounds, amorphous alloys, and metal matrix composites.

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Scalability

VIM furnaces can be designed and scaled to suit different production capacities and requirements. This flexibility makes it suitable for both small-scale research purposes and large-scale industrial production.

Vacuum Induction Melting is a highly advantageous method for producing high-quality and pure metals and alloys. It offers high purity, rapid melting and cooling, reduced energy consumption, etc. which leads to high-quality metals and alloys with tailored properties. For these reasons, vacuum induction melting is a preferred choice in the metallurgical industry.

Vacuum heat treatment can achieve almost all heat treatment processes such as quenching, annealing, tempering, carburizing, chromium and nitriding. Compared with ordinary heat treatment, it has the following advantages:

Advantages of vacuum heat treatment

1. No oxidation, no decarburization, and no carbon increase on the inner surface of the workpiece have a very good protection effect.

Oxidation makes the metal surface lose its metallic luster, increases surface roughness, and reduces precision, steel surface oxide is often the source of quenching soft spots and quenching cracking, reducing the strength of steel and other mechanical properties.

Vacuum heat treatment because the metal is heated under a certain vacuum, the workpiece avoids contact with oxygen, the workpiece has no oxidation, no decarburization, bright surface, good quality heat treatment, in the vacuum state, no recovery reaction, no carbon increase phenomenon. After adding a protective agent on the surface of the workpiece, the advantages of vacuum heat treatment are more obvious compared with vacuum quenching.

2. Improve overall mechanical properties, degassing, and promote metal surface purification

The vacuum has an obvious degassing effect on liquid metal and also has a good degassing effect on dissolved gas in solid metal. Hydrogen is the most harmful gas in metals. When heated in a vacuum, the hydrogen in metals and alloys can be quickly minimized to eliminate hydrogen embrittlement, thus improving the plasticity, toughness, and fatigue strength of the material and the overall mechanical properties of the workpiece. When metals and alloys are heated in a vacuum, if the vacuum level is lower than the decomposition pressure of the corresponding oxide, the oxide will decompose and free oxygen is immediately discharged from the vacuum chamber, further improving the surface quality of the metal.

3. Workpiece deformation

Generally speaking, the treated workpiece is heated in the furnace by thermal radiation, the temperature difference between inside and outside is small, and the thermal stress is small, which determines the small deformation of the parts during vacuum heat treatment. At the same time, heating and quenching under a vacuum are automatically completed, avoiding the handling of hot workpieces in the air (salt bath treatment and atmospheric protection treatment, although heated in an adiabatic environment, but still quenched in the air or quenching medium containing oxygen molecules), reducing the artificial processing deformation.

4. can reduce the volatility of the workpiece containing gold elements

Vacuum heat treatment can be heated and quenched in a controlled atmosphere, thereby reducing the volatility of gold elements in the workpiece to ensure the quality of heat treatment of the workpiece.

5. The vacuum heat treatment furnace has high thermal efficiency, can quickly heat up and cool down; has good stability and repeatability, a good working environment, safe operation, no pollution, and public hazards.

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