As new engineering coatings get ever thinner and more technologically advanced, there is an increasing demand for accurate assessment of the mechanical properties of the thin films, for instance ultra-thin carbon layers on magnetic heads, electronic pads for MEMS and LB films. The rapidly expanding field of depth-sensing evaluation and techniques related provides a quantitative method for mapping the micro mechanical properties. A new type of nano test system was introduced, the technology principle and the data analysis metho0d were described. It was used to test the performance of thin films on silicon wafer, steel and glass prepared by many kinds of technologies, this included nanoindentation, to evaluate the mechanical properties, such as hardness, elasticity modulus, and nanotopography to test the thickness and roughness, and nanoscratch to investigate the scratch resistance as well as the deformation and failure behaviour of the films. The results show that nanoindentation and nanoscratch techniques are very useful tools in charactering the performance of thin films in nano scale.

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory.Abstract: This paper studies paint removal using laser technology. A finite element model was created using COMSOL Multiphysics software, and the temperature field generated during the cleaning process was analyzed and verified. Laser paint removal behavior was investigated using a fiber laser, and its mechanism studied by combining Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy. In-depth analysis of this relatively new technology could provide the theoretical basis for industrial application. The results of this study show that, when compared to the original paint layer, the infrared absorption spectrum of the cleaned surface had two additional two peaks-1333.36 cm −1 and 678.82 cm −1 . In addition, there was a decrease in C element content on the treated surface and an increase in O content. In addition, new organic and complex compounds were formed on the cleaned surface as a result of bond cleavage and rearrangement. Furthermore, paint particles of varying sizes and shapes were produced by the impact of plasma shock. Under high-energy laser irradiation, the paint layer underwent combustion, resulting in spherical nanoparticles of uniform shape.

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