Laser‐Assisted AFP In Situ Consolidation of CF / PEEK : Pyrolysis Kinetics and Pyrolysis Yield

ABSTRACT This study investigated the pyrolysis kinetics of carbon fiber‐reinforced polyetheretherketone (CF/PEEK) under laser heating. Kinetic models (Kissinger, Friedman, Flynn–Wall–Ozawa, and Kissinger–Akahira–Sunose) based on thermogravimetric analysis (TGA) data established equations predicting the optimal process temperature window and critical residence time for laser systems. Real‐time Fourier transform infrared spectroscopy (FTIR) monitored functional group evolution during pyrolysis. Microstructural damage at different stages was characterized using SEM and 3D surface morphology analysis. The ASTM D2344 short beam shear test evaluated interlayer mechanical property evolution under gradient temperature fields. Results showed that at 550°C, 100 mm/s laying speed, and 200 N pressure, the sample's interlayer shear strength peaked at 87.18 MPa. However, at 650°C, significant surface thermal decomposition and carbonization occurred. FTIR revealed maximum intensity for the carbonyl (CO) bond stretch (1651 cm ⁻¹ ) and aromatic ring CC vibration (1594 cm ⁻¹ ) at this temperature, correlating with a shear strength decrease to 73.39 MPa. The study demonstrates that establishing an Arrhenius‐type kinetic equation from thermal analysis allows accurate prediction of thermal decomposition extent. This provides a theoretical basis for optimizing laser‐assisted automated fiber placement parameters.