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Tungsten heater for vaporization


Vaporization is the transition of matter from a solid or liquid phase into a gaseous or vapor phase. Water boiling into steam is an example of vaporization.

Sublimation is the more specific name for the vaporization directly from the solid phase to the gaseous phase.
The process of coating a mirror with aluminum. The aluminum is vaporized in a vacuum, causing a film of metal, about 100 nanometers thick, to be deposited on the glass. Layers of other materials, such as silicon dioxide, may subsequently be laid down to give protection. Aluminum offers consistently high reflectance throughout the visible, near-infrared, and near-ultraviolet regions of the spectrum.

Before the 1930s, when the vacuum aluminizing technique was developed, the only method available for coating mirrors was silvering in which the silver was deposited chemically by a process developed by the German chemist Justus von Liebig. The initial reflectivity of silver (89 to 93%) is slightly higher than that of aluminum throughout most of the visible spectrum, but this advantage is short-lived because silver quickly tarnishes, whereas the reflectivity of an aluminum coating drops by only a few percent per year. Silver, too, is much more expensive.

Tungsten heater made of tungsten wire, single or multiple strand tungsten, mainly applied for vaporization and vacuum metallizing, such as aluminizing scope, aluminum spraying, chrome scope, mirror making, ceramic coating, plastics and heater element for decoration articles. Tungsten heaters can be stranded into single or multi wires according to the samples or drawings of customers. Pure wire and doped wire are both available. Diameter of tungsten wire: 0.2-1.2mm.

 

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