Polyamide 6 (PA6) is a thermoplastic material widely used in manufacturing for its excellent mechanical
properties, such as high strength, stiffness, and toughness. However, its suitability for powder bed fusion (PBF)
is limited due to its susceptibility to thermo-oxidative aging, resulting in material degradation and mechanical
property deterioration over time. To address this issue, the efficacy of antioxidants in increasing the aging
resistance of PA6 in PBF was investigated. Process-adapted analysis was employed using a coupled rheometer
FTIR instrument to elucidate physical and chemical changes in the material. In addition, the viscosity number of
the virgin and processed powder, the yellow index, and the part performance were evaluated. Results revealed
that the addition of primary and secondary antioxidants significantly enhanced the aging resistance of PA6 in
PBF, thereby increasing its potential as a suitable material for additive manufacturing applications.Mechanical Engineerin
