Tungsten Boat for Vacuum Coating

Thanks to a high melting point, a low vapor pressure and stable chemical property, tungsten boat is widely used in vacuum evaporation coating industry as a resistance evaporation source.

Vacuum coating technique is a kind of technology to produce thin film material by physical means. In the vacuum chamber, atomic of material is isolated from the heating source and hit the plated object’s surface. This technology was first used in the production of optical lenses, such as navigation telescope lens. Later it extended to other functional film, such as music aluminizing, decorative coating and surface modification. Vacuum coating includes three types, named vapor deposition, sputtering deposition and ion plating.

As a main source of resistance heating, W (wolfram) boat is widely applied to vacuum deposition: use a refractory metal, such as W-boat, to form the shape of boat or shape of wire, i.e. Make the current pass them, and then heat evaporated material which place above it or place in the tungsten crucible. Adopting W-boat for vacuum deposition would save more material which can accelerate the speed of volatilization of powder, the required temperature. On the other hand, it just need low temperature and heating current but evaporation brilliant is much stronger which can produce film on the substrate.

Tungsten boat for vacuum deposition can make the material surface metallization, combine the organic materials and inorganic materials to further improve its physical and chemical properties. In addition, it can also improve the surface hardness. Vacuum deposition can increase its hardness and abrasion performance. And reduce the absorption rate, the more the coating times, the less vacuum, and the absorption rate will be reduced. Products would not easily to be deformed, and its heat resistance would enhance. Vacuum deposition has a high deposition rate if using wolfram boat.

When use W-boat for vacuum deposition, operators should keep inflammable poison safely in case of fire poisoning. When washing parts and wolfram boat, operators should wear rubber gloves. When off duty, don’t forget to turn off the power and disconnect water source.