Abstract
Enhanced cutting tool blades are required to manufacture next-generation small multilayer ceramic capacitors. Cemented tungsten carbide is used as the material for these blades. Recently, laser ablation has been used to fabricate sharp fine blades. In this study, a femtosecond laser was used to precisely and finely machine cemented tungsten carbide. Furthermore, we analyzed the interaction between the femtosecond laser and cemented tungsten carbides depending on the laser fluence. Scanning electron microscopy, confocal laser scanning microscopy, and a two-temperature model were used for the analysis. Based on this analysis, we understood the formation of burrs, nanoparticles, and droplets induced by a femtosecond laser. A laser beam with a diameter of ~ 16 µm was used for irradiation. Moreover, beams with fluence values of 0.24, 1.13, 2.12, and 3.40 J/cm2 were irradiated on the surface of cemented tungsten carbides. The total fluence was the same as that of the absorbed surface. Although the total fluence was the same, burrs, nanoparticles, and droplets were generated at higher fluences. Owing to the higher fluence, the temperature increased, thus increasing the time required to achieve thermal equilibrium between the electron and the lattice. Consequently, we propose the formation process for burrs, nanoparticles, and droplets. In addition, we demonstrate a machining solution without burrs, nanoparticles, or droplets. These results will prove useful across a number of different industries.
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Shin, YG., Ji, SY., Choi, J. et al. Morphologies of cemented tungsten carbide ablated by pulsed femtosecond laser to manufacture next-generation blades of a cutting tool. Appl. Phys. A 128, 828 (2022). https://doi.org/10.1007/s00339-022-05945-8
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DOI: https://doi.org/10.1007/s00339-022-05945-8