Vacuum melting, also known as vacuum induction melting (VIM), is a process that involves melting metals and alloys under vacuum conditions using electromagnetic induction.
This process is primarily used for refining metals and alloys, effectively removing dissolved and chemical-bonded impurities.
The result is a clean and homogeneous end product.
7 Key Points to Know About Vacuum Melting
1. Refractory Lined Crucible
In the vacuum induction melting process, a refractory lined crucible is enclosed in an induction furnace within a vacuum chamber.
2. Airtight Furnace
The furnace is airtight and capable of withstanding the required vacuum for processing.
3. High Melting Points
The metals used in vacuum induction melting typically have high melting points, up to 1800°C.
4. Elimination of Contamination
The main purpose of vacuum processing is to eliminate contamination from the processing environment and reduce the level of impurities in the final product.
5. Release of Impurities
During the melting process, impurities such as oxygen, nitrogen, hydrogen, and carbon are released from the molten metal and pumped out.
6. Electromagnetic Induction
The vacuum induction melting process is achieved through electromagnetic induction. An alternating current is passed through the induction coil, creating electrical eddy currents in the metal.
7. Applications and Industries
Vacuum induction melting is widely used in various industries, including aerospace, automotive, and electronics, for the production of high-purity metals and alloys with specific properties and performance characteristics.
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