ОЦІНКА ВПЛИВУ ДОБАВКИ МІДНОГО ГІДРОКСИАПАТИТУ НА ФЕМТОСЕКУНДНУ ЛАЗЕРНУ АБЛЯЦІЮ АРМОВАНИХ ВУГЛЕЦЕВИМ ВОЛОКНОМ ПЛАСТИКІВ

Carbon fiber reinforced plastics (CFRP) are widely used in aerospace, automotive, and marine industries due to their excellent strength-to-weight ratio, chemical resistance, and formability. However, their heterogeneous structure complicates conventional machining, often requiring multistep processing. Laser micromachining, particularly with femtosecond (fs) pulses, offers a promising alternative by minimizing heat-affected zones (HAZ) and enabling precise ablation. Yet, uneven ablation between the epoxy matrix and carbon fibers remains a challenge. In this work, copper-substituted hydroxyapatite (Cu-HAp) microparticles were synthesized and introduced into the epoxy matrix to improve laser energy absorption and ablation uniformity. SEM analysis revealed that Cu-HAp particles possess a hierarchical quasi-cubic morphology with a high surface area, favorable for infrared absorption. CFRP samples modified with Cu-HAp were processed using a 1030 nm fs-laser, and the resulting surface morphology was examined. Compared to unmodified systems, Cu-HAp-modified composites showed more defined ablation zones, deeper material removal, and enhanced uniformity across fiber and matrix phases. The results confirm that Cu-HAp serves as an efficient near-infrared absorber, enhancing the precision and quality of fs-laser machining of CFRP. These findings support the potential of Cu-HAp additives for advanced micromachining and functional surface structuring of polymer composites.