Equipment |Thermal Evaporation Equipment

Thermal Evaporation Equipment

Thermal evaporation is one of the most common ways to deposit a thin layer of material on a surface using gaseous mediums.  The process involves heating material in a vacuum chamber until the atoms on its exterior have enough energy to leave the surface. The atoms then sail about the vacuum chamber, coating a substrate situated above the evaporating material in the process. With a resistance boat or coil, current is passed through a broad metal ribbon with a large "dimple" where pellets of material are placed. As current in the ribbon is elevated, the "boat" gets hotter until the pellets melt and evaporate, coating the desired surface. Knudsen cells, Radak furnaces, and other sources have a crucible which can be exposed to a controllable heat source.  The source material is heated in the crucible until it melts and evaporates, flowing out of the open end of the crucible and to the target surface.