▲ Good adhesive force of thin film
In the case of ordinary vacuum coating, the particles of the evaporation material are evaporated to the surface of the workpiece with energy of about one electron volt. The depth of the interface formed between the surface of the workpiece and the coating is usually only a few hundred angstroms (10,000 angstrom =1 micron =0.0001 cm). In ion plating, the ionized particles have energy of 3,000 to 5,000 electron volts after ionization. When the workpiece is bombarded with the electro ion at high speed, not only the deposition rate is fast, but also the surface of the workpiece can be penetrated to form a diffusion layer with deep injection of the substrate, and the diffusion depth of the ion plating interface can reach 4 to 5 microns. The depth of diffusion is deeper than that of ordinary vacuum diffusion membranes by several tens or even hundreds of times, and thus the adhesion force is particularly strong. The tensile test of the specimen after ion plating shows that the coating still stretches with the matrix metal, without peeling or decoating, when it is pulling until the fracture is near.
▲ Strong coating capacity
In ion plating, the evaporating particles move in the direction of the power line in the form of charged ions in the electric field, so that any part where there is an electric field can obtain a good coating. Compared with the coating which can be obtained only in the direct direction is much more superior. Therefore, this method is very suitable for parts that are hard to be plating by other coating methods such as internal holes, grooves, and narrow slits on parts.
▲ Excellent coating quality
The ion-plated coating has a dense structure, no pinholes, no bubbles, and a uniform thickness. Even facets and grooves can be evenly coated, and metal bubbles do not form. Because this method can also repair defects such as micro-cracks and pits on the workpiece surface, it can effectively improve the surface quality and physical and mechanical properties of the parts being plated.
▲ Rinsing process simplification
Most of the existing coating processes require strict cleaning of the workpiece in advance, which is complicated and costly. However, the ion plating process itself has an ion bombardment cleaning effect, and this effect will continue throughout the coating process. The cleaning effect is good, the coating can be directly attached to the substrate, the adhesion of the film is effectively enhanced, and a large amount of pre-plating cleaning work is simplified.
▲ Wide range of plating materials
The ion plating is using high energy ions to bombardment of the workpiece surface, so that a large amount of electric energy is converted into heat energy on the surface of the workpiece, thus promoting the diffusion and chemical reaction of the surface tissue. However, the whole workpiece, especially the inner part of the workpiece, is not affected by high temperature, so the coating technology has wide application scope. In general, various metals, alloys and some synthetic materials, insulating materials, thermal sensitive materials and high melting point materials can be plated. The metal workpiece can be plated with or metal or non-metallic materials, or even plastic, rubber, quartz and ceramics can be plated.