Evaporators of this type are the best option for use in the metallurgical industry, because because of the particularly refractoriness of tungsten, products made from it are able to withstand temperatures up to 3000 ° C.
In addition, they are practically immune to oxidative reactions, are characterized by high resistance to aggressive media and damage during heating.
Used for deposition of films in vacuum. The principle of operation of this device is quite simple. The sprayed substance is placed directly in the evaporator, which during heating and evaporation is deposited on the desired surface.
As the simplest tungsten sheet evaporator, a tungsten product is usually used, visually representing a thin plate with a depression of the required shape.
The parameters of the sheet itself and the recesses are set depending on their operational need.
In addition, tungsten boats or crucibles obtained from metal sheets by riveting (bending) or by powder pressing with further mechanical processing are often used as evaporators of this type.
They are usually used in cases where the evaporated substance has insufficient wettability (for example, granules or powder) or there are some other reasons that do not allow the use of a wire evaporator.
Tungsten boats are used in various industrial sectors, most often in metallurgy, due to the high temperatures that they can withstand.
Used in glass melting and reduction of metal oxides, sintering and annealing in the vacuum industry, etc.
In addition, it is worth noting that due to the peculiarities of its design, this type of evaporator allows you to evaporate a larger amount of substance than wire, moreover, they are more inertial, and therefore in most cases it is preferable to use.