Metallization process - Surface Treatment

                 

Can be made into almost any kind of metal wire can be sputtering, metal spraying has many important applications, metallized decorative effect can be provided for the product.

Metallization technology has certain requirements:

Metallization process work must be pretreated substrate surface, the membrane material and the substrate metallization citation belongs mechanical bond, to get a good degree of mechanical bonding must be cleaned. Wire must be free of rust, grease-free, clean, standards-compliant. The substrate to be frosted.

Spraying construction environment metallization process should be higher than 5 degrees Celsius, if the air is humid, rain must be indoors. Spraying using thermal spraying method, the distance preferably 100-200mm, thermally sprayed belong manual operation, with respect to the vacuum coating apparatus by certain disadvantages for coating system.

When spraying, the spray gun should be perpendicular to the substrate, the angle of not less than 45 degrees, the maximum distance of not more than 200mm.

Spray coating thickness should grasp, generally after more than 0.1mm thickness to be layered deposition, the substrate temperature must not exceed 100 degrees Celsius, the moving speed of the gun should be uniform, 300-400mm / s better, spraying process can not hand touching sprayed surfaces.

Qualified metallized surfaces should be evenly without bubbles, no adhesion to the metal, you can use a magnifying glass to check the appearance, not only the appearance of quality to be qualified, but also qualified plating thickness, during an inspection if found to be defective should be re-fill plating .

Common metallization

Chrome: Chrome is a silvery white metal, a little bluish, there are five types, it is now widely used product modeling plating. There are chrome-plated guard, black chrome plating, hard chrome plating, porous chrome, white chrome.

Plated alloy: Alloy is required development of industrial production, some products require alloy properties, such as cobalt alloy, it looks pale pink, has strong corrosion resistance, plating out the effect of the system is very warm. For example tin alloy, corrosion resistance is better, a higher wear resistance and hardness, good polishing performance.

Silvered: a white light, high plasticity of the noble metal, silver having good conductive properties, can be improved conductivity performance of the product, it is fine silver metal, also commonly used for decoration.

Electron Beam Evaporation Vacuum Coating Machine Principles and Characteristics

Electron Beam Evaporation Vacuum Coating Machine Working Theory

Electron beam evaporation source is heated by hot cathode emits electrons in the electric field, a high energy density electron beam directly onto the coating material bombardment. Kinetic energy of the electron beam is converted to heat, so that the material is heated to be gasified, complete evaporation coating.

The kinetic energy of electrons in the electric field potential U, obtained was
The kinetic energy of electrons in the electric field potential U, obtained
 In the formula, (electron charge to mass ratio). If the flow rate of the electron beam of electrons ne, the thermal effect is generated electron beams Qe

 Qe = neeUt = IUt

 Where

       I- beam electron beam, A;

       t- beam current duration of action, s;

      U- potential difference, V.

When the potential difference generated by the thermal energy (acceleration voltage) is high, the formula (Qe = neeUt = IUt) can make the membrane vaporized, thereby providing a good source for vacuum coating technology.

 Electron beam heating evaporation advantages:

① electron beam heating than resistance heating has a higher energy density, high melting point materials can be evaporated, such as W, Mo, Al2O3, etc., and to obtain a higher evaporation rate;

② vaporized materials into the water-cooled copper crucible, to avoid contamination of the crucible material, a thin film of high purity can be prepared;

③ particle kinetic energy electron beam evaporation, is favorable for obtaining a dense, good film adhesion.

 Electron beam heating of disadvantages:

① structure is more complex, more expensive equipment;

② If the high vapor density near the evaporation source, the interaction between the electron beam occurs and vapor particles, electron energy loss and the track will be offset. While causing excitation and ionization vapor and residual gas will affect the film quality.

Widely applications of vacuum coating machines

  A lot of consumers know little about vacuum coating machine concept, do not understand uses of vacuum coating machine in the market;in fact there are a lot of derivatives of vacuum coating machines which are closely related with the consumer, coater buyers generally engaged in the following sectors: one category is mainly decorative, highlighting its decorative function, commonly used in plastic toys, gift wrap coating, cell phone case, digital products shell, windows, tiles and other gold-plated.
  Another feature is the main highlight of the function coating applications. Will be following industries: solar collector tubes, eyeglasses and lenses AR high back,increase the tools and moulds hard,the phone shell radiation shielding.
  Above two industries are closely related with the vacuum ​coating machines, so in life, vacuum coating machine is very important.

Major advantages of vacuum coating machine in plastic industry?

  Nowadays, “vacuum” has been widely used in various fields. It’s aimed to protect the products from the damage caused by impurity, and overcome the disadvange in normal environment. That’s the major reason why vacuum coating machine is applied in plastics industry.
  The plastic products are popularly used in people’s life with the advantage of easy forming, low cost, light quality, no corrosion; But its disadvanges, such as non-beauty, easy aging, poor mechnical performance, have restrained its expansion in application.
  This vacuum coating technology can metallise the plastic surface, and combine the orgnic material with inorgnic material.
The advantages of the vacuum coating machine’s application are as the following:

1.Easy cleaning, no absorbing dust

2.Electric conductivity in the plastic surface

3.More decorative function, making the surface more beautiful, smooth, colorful

4.Decrease the water absorbsion, improve heat resistance, not easy to deformation

5.Enhance the hardness and wear-resistanc

6.Imprive the characteristics of weather resistance. Usually, the plastics age quickly in the outdoor because of the ultraviolet radiation; But the coating aluminum film can reflect the UV strongly and improve the weather resistance.