When it comes to evaporation, heating the source material is a crucial step.
There are two primary methods used to achieve this: resistive heating and electron beam heating.
What are Two Common Ways to Heat the Source Material in Evaporation?
1. Resistive Heating
Resistive heating involves using a heating element or filament to heat the source material.
The filament is typically made from materials like tungsten, molybdenum, quartz, or graphite.
A large current is passed through a resistive wire or foil that contains the metal material.
As the filament heats up, it reaches its melting point.
This heat is transferred to the source material, causing it to evaporate or sublimate into a vapor.
2. Electron Beam Heating
In electron beam heating, an electron beam is used to heat the source material.
The electron beam is generated by an electron gun.
This beam is directed at the source material, causing it to heat up and evaporate or sublimate.
Electron beam evaporation offers precise control over the heating process.
It also allows for high deposition rates.
Both resistive heating and electron beam heating are commonly used in evaporation processes.
These methods heat the source material to high temperatures, causing it to vaporize and condense onto the substrate.
Each method has its own set of advantages and is chosen based on factors like the coating material, deposition rate, coating quality, and film thickness control.
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