フェムト秒レーザによる炭素系複合材料の精密切断加工

概要

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Fiber reinforced plastic (FRP), carbon fiber reinforced plastic (CFRP), and polycarbonate (PC) are three components being applied widely and increasingly in automobile and aerospace industries because of their wide range of beneficial physical properties. This study investigated microfabrication of laser cutting of three samples (FRP, CFRP, and PC) using a Ti:sapphire femtosecond laser (90 fs pulse width, 800 nm wavelength, 1 kHz frequency). Experimental results were analyzed using optical microscopy and scanning electron microscopy. Results show that edge angles of upper and lower cross-sections on the three samples were cut precisely to nearly 90 deg angles. The cutting results of FRP and CFRP demonstrated that the fiber damage is slight and that a smooth surface was obtained. However, the crosssection of PC cutted was not burnt with partial damage. For comparison, laser cutting using CO2 laser was also performed on the three samples. Experimental results showed that microfabrication using femtosecond laser is far superior because it creates a smoother surface than the CO2 laser, with little or no thermal damage. In conclusion, microfabrication by cutting these three materials (FRP, CFRP, and PC) was possible using a femtosecond laser.
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