탄소 섬유 강화 열가소성 복합재의 레이저 파장에 대한반응성 연구

In the laser processing of carbon fiber reinforced thermoplastics (CFRTP), we evaluated the interaction between thelaser and the material based on parameters such as wavelength (355, 532, and 1064 nm), power, and scanningspeed. We observed that shorter wavelengths increased the photon energy, which boosts energy absorption in thePA6 polymer, subsequently influencing the processing quality and outcomes. When the energy per pulse wasconsistent, the kerf width at 1064 nm exceeded that at 355 nm; however, the heat-affected zone (HAZ) wassmaller. Despite the lower energy requirements for penetration, the uniformity of the fiber cross-section wasreduced. At 532 nm—positioned between 355 and 1064 nm—the carbon fibers exhibited greater optical absorptionthan at 1064 nm, whereas the polymer reactivity was lower than that at 355 nm. This wavelength allowed forefficient penetration processing with minimal energy, reduced HAZ, and maintained a fiber cross-sectionaluniformity similar to that at 355 nm. Because all three wavelengths were absorbed within tens of nanometers ofthe carbon surface, the heat transfer mechanisms across the carbon fibers remained consistent. The optimalprocessing quality was achieved by balancing high carbon fiber absorption with low polymer absorption, a conditionbest met at 532 nm, facilitating high-quality processing with minimal thermal impact.