Some problems of vacuum coating equipment
Although the vacuum coating machine is a nano level machine, which is very precise, it can only control the film thickness at a single point in the vacuum chamber regardless of the precision of the monitor in the machine. In generally，it is the middle position of the work-piece holder. If the film thickness in the center of the vacuum coating machine is not uniform, the substrate far away from the center can not get uniform thickness. Although the shield can eliminate the long-term non-uniformity, some film thickness changes are caused by the instability of the evaporation source or the different performance of the coating material, so it is almost impossible to eliminate this problem, but the proper selection of the structure of the vacuum chamber and the evaporation source can minimize these effects. In other words, it is very important to choose a high-quality vacuum coating machine, which can reduce unnecessary troubles.
As countries around the world attach importance to environmental protection, environmental protection laws are becoming stricter. The development of the social economy has put forward new requirements to the traditional high-consumption, heavy-pollution electroplating industry. The electroplating industry is a basic industry that involves a wide range and cannot be directly banned. Therefore, it needs to be upgraded. Vacuum coating as a green coating technology is a new technology concept in the field of surface engineering. Vacuum composite coating integration technology is used to replace or partially replace traditional chemical plating technology to achieve the purpose of protecting the environment, reducing consumption, reducing emissions, and eradicating the three wastes of electroplating. Continue to develop contradictions with environmental friendliness, and earnestly build an environmentally friendly and resource-saving society. Vacuum coating technology includes vacuum ion coating, magnetron sputtering coating, evaporation coating, ion implantation, ion cleaning and a series of single technologies and the integration of multiple composite technologies, involving vacuum, machinery, control, optoelectronics, material modification, surface Engineering, information and other multidisciplinary fields of integration of optical, electrical and mechanical control.
The advantages of vacuum coating technology over traditional electroplating technology: In the past, electroplating and electroless plating were mostly used for coatings. Not only the thickness is difficult to control, the uniformity of the film is poor, the adhesion is poor, but there are also particularly serious problems such as three wastes. Today, people's awareness of environmental protection is gradually increasing, and its development has been restricted by various aspects. The vacuum coating technology has a simple technological process, improves the environment, has no pollution, has fewer consumables, has uniform and dense film formation, and has strong binding force with the substrate. Compared with the traditional electroplating method, the vacuum coating technology has many advantages, such as good decorative effect, strong metal texture, low cost (about 1/3 to 1/2 of traditional electroplating), and easy operation. Especially in the application of non-metallic objects, it has advantages that traditional electroplating cannot match. In view of this, vacuum coating has been widely used in the surface metallization of various plastics, ceramics, glass, wax, wood and other products.
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