In the field of mobile phone cover, the application of PVD coating decoration technology is more and more widely used. In the metal, glass, ceramic and composite back cover, PVD coating is needed to enhance the face value and force of the phone cover. What is the beauty and taste of the product through coating? What are the mainstream processes? Let's take a look today.
1. The inner surface of the glass is coated with a reflective film.
2. The outer surface of the glass is coated with AG and AF film to increase the hand feeling. The inner surface is coated with color film.
3. Composite sheet plating anti-blue light (ice flame blue)
3. Zirconium oxide ceramic and glass cover outer surface coating
PVD coatings are mainly divided into evaporation plating, sputtering plating and ion plating. Today, we mainly compare evaporation and sputtering.
Evaporation coating is to deposit the film material into the gas phase and then deposit it on the surface of the substrate. The film formation method determines that the energy of the evaporated particles can only be 0.1-0.3 ev, the atomic kinetic energy is too low, and the packing density is too low.
The instability of electron beam evaporation and its internal mechanism:
| Impact type | Problems | Internal mechanism |
| temperature | Film formation temperature affects product color | High temperature, high packing density, low drift |
| Effect of oxidation capacity of vacuum chamber | Long wavelength before large cleaning, then short | * Water vapor can be considered as oxygen. * Coating speed directly affects oxidation capacity, That is, the ratio of metal or suboxide in the film layer. *The substance evaporated from the crucible is a high-valence oxide, A mixture of suboxides and metal monomers, more metal monomers or suboxides will trap more oxygen atoms in the atmosphere and make the film dense. |
| When the air humidity is high, the film color is not well controlled. | ||
| Long furnace length | ||
| Coating slow wavelength long | ||
| Effect of membrane decomposition | Looks like the size of the electron gun spot has an effect | * Spot position affects spot size. * Filament deformation will also bring about changes in spot size. * When the scan is fast enough, the surface evaporates, and when it is slow, it still evaporates. This of course is equivalent to the "spot size" problem. *The spot is small, the temperature in the evaporation zone is high, and the material is seriously decomposed. The ratio of metal monomer to suboxide is higher. |
| Looks like the spot position also has an effect | ||
| Looks like filament deformation also has an effect | ||
| Looks like the speed of scanning also has an impact | ||
| ......... |
The magnetron sputtering coating ionizes argon by applying an electric field between the target and the wall of the vacuum chamber, and accelerates the argon ions against the surface of the target. The target is struck by the sub-ion, the target atom overflows and kinetic energy of tens or even hundreds of electron volts is directed to the surface of the substrate to be plated and deposited on the surface of the substrate. The atomic kinetic energy is two orders of magnitude higher than the evaporation, and the packing density is as high as 98%. The refractive index is high and stable.
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