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| Study on Mechanical Properties of Polyetheretherketone/Tantalum/Niobium Lattices Made by High Temperature–Selective Laser Sintering |
| CAI Haosong1 , CHEN Peng1 , SU Jin1 , WANG Mingzhe1 , WANG Haoze1 , YAN Chunze 1, 2, 3, WANG Wei2 , SHI Yusheng1 |
| (1. State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 2. Huake 3D Science Technology Ltd. of Zhejiang Province, Wenzhou 325004, China; 3. Rearch Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen 518000, China) |
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Abstract 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).
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2021, 
