Polyetheretherketone (PEEK) has high heat resistance and excellent mechanical properties

suitable for the applications in high temperature environment of aviation. Light lattice structures can be produced by additive manufacturing (AM) to replace the conventional solid structure and realize the lightweight of aviation parts. Therefore

in this paper

the PEEK/Ta/Nb composite powders are prepared

and the triply periodic minimal surface (TPMS) gyroid lattice structures of PEEK/Ta/Nb were fabricated by high temperature–selective laser sintering (HT–SLS) additive manufacturing technique. The compressive properties of composite lattice structures were studied and the fracture mechanism was clarified. The results show that gradient gyroid lattice structure allows smooth transition at the cell junctions

but the stress concentrates at the inclined bar of large porosity

which can lead to a layerwise collapses at a 45° fracture direction. The yield strength of PEEK/Ta

PEEK/Nb and PEEK/Ta/Nb is increased by 23.5%

6.7% and 44.5% respectively compared with that of PEEK (1.19 MPa).