Evaporation, or more specifically, Resistance Thermal Evaporation, involves the heating of the evaporation material within a vacuum environment. The materials used in vacuum evaporation are usually made into pellets, so they are also called evaporation pellets. These pellets are heated to a temperature above which the vapor pressure of the material exceeds that of theContinue reading “Evaporation Pellets Used in Thermal Evaporation”
Category Archives: evaporation technology
Thermal Evaporation History Part Four
Evaporation or sublimation of compounds can result in extensive molecular disassociation. Some compound materials can be vaporized without significant disassociation. These include many halides, sulfides, and selenides, as well as a few oxides (such as SiO). Many of these compound materials were used in early optical coating “stacks,” and for many years thermal evaporation wasContinue reading “Thermal Evaporation History Part Four”
Thermal Evaporation History Part One (From late 1800s to early 1900s)
Thermal evaporation or vacuum evaporation is the vaporization of the evaporation material by heating to a certain temperature, so that the vapor pressure becomes appreciable, and the surface or molecules are lost from the surface in the vacuum. Vaporization can come from the surface of a liquid or from the surface of a solid. TheContinue reading “Thermal Evaporation History Part One (From late 1800s to early 1900s)”
4 Types of Vacuum Evaporation Coating
Resistance evaporation The resistance evaporation source is used to evaporate low melting point materials such as gold, silver, zinc sulfide, magnesium fluoride, chromium oxide, and the like. The resistance evaporation source is generally made of tungsten, molybdenum or tantalum. Electron beam evaporation The evaporating material is vaporized and evaporated by electron beam heating, and condensed on the surface of the substrate to form aContinue reading “4 Types of Vacuum Evaporation Coating”
Vacuum Evaporation Coating 