TPMS SiC structures produced by chemical vapour infiltration of SiC preforms shaped by powder bed fusion and binder jetting: a preliminary study on the early stages of the CVI process

This study combines two additive manufacturing (AM) techniques, named binder jetting (BJ) and powder bed fusion (PBF), with chemical vapor infiltration (CVI) to produce SiC architectures with enhanced mechanical and oxidation resistance properties. Using TPMS-based gyroid geometries, complex preforms were fabricated via AM and then densified through CVI. These preliminary results demonstrated that this approach could successfully produce intricate porous preforms, with structures achieving high relative density maintaining geometric stability during processing. The 10 h CVI process significantly improved the mechanical properties, with BJ-derived samples reaching an increase in compressive strength after two infiltration cycles (∼14 MPa). Oxidation tests at 1500°C confirmed excellent resistance, with the formation of protective SiO 2 layers contributing to material durability. These findings highlight the potential of combining AM and CVI for producing high-performance SiC ceramics. This approach offers a pathway to developing advanced materials tailored for demanding applications in energy, aerospace, and high-temperature industrial systems.