The principle of laser cleaning
Laser cleaning is the use of laser beam has a large energy density, controllable direction and convergence ability and other characteristics, so that the bond between the pollutants and the substrate is destroyed or the pollutants directly gasification and other ways to decontamination, reduce the pollutants and the substrate of the bonding strength, and then achieve the role of cleaning the surface of the workpiece. The principle of laser cleaning is shown in the figure below. When the contaminants on the surface of the workpiece absorbs the laser energy, its rapid vaporization or instantaneous thermal expansion to overcome the contaminants and the surface of the substrate between the force, due to heat energy rise, the contaminant particles vibration and fall off from the surface of the substrate.
Application of laser cleaning
Laser cleaning in industrial production as a pre-processing procedures, not only can be effective in removing rust, decontamination, etc., but also can make the substrate surface chemical reaction, to generate a layer of protection to prevent the substrate from rusting again, to improve its corrosion resistance. At present, laser cleaning technology has been applied to the military, mold cleaning, surface treatment, microelectronics, cultural relics and medical protection and other fields.
Laser cleaning of the light source control
In order to optimize the effect of laser cleaning on the surface of the object to be cleaned, it is necessary to take into account the laser cleaning method, cleaning model, the wavelength of the laser, energy density, power, pulse frequency, pulse time, and laser incidence angle and other process parameters. Pulsed laser can effectively clean the surface corrosion of carbon steel. Only by systematically studying the process parameters, can we form a set of efficient laser cleaning system. For example, pulse width: laser cleaning can make the grain structure and orientation of the substrate surface change without damaging the surface of the substrate, and can also control the roughness of the substrate surface, thus enhancing the comprehensive performance of the substrate surface. As an important parameter of laser cleaning, pulse width needs to be controlled reasonably. Reasonable control of the pulse width of the cleaning efficiency control, the effect will be greatly improved. However, the adjustment of pulse width will also affect the changes of other parameters, so it is necessary to systematically study the relationship between the parameters and a large number of experiments to get the optimal results. As an advanced technology in laser manufacturing, laser cleaning technology has great potential for application in industrial development, and it is of great strategic significance to vigorously develop laser cleaning technology.
