Zambotti,A.Kulkarni,A.Semerci,T.Vakifahmetoglu,C.Pelanconi,M.Bottacin,S.Sorarù,G.D.2024-06-192024-06-1920242666-5395https://doi.org/10.1016/j.oceram.2024.100603https://hdl.handle.net/11147/14572Zambotti, Andrea/0000-0002-8653-055XThis work proposes the processing of porous ceramic lattices via three polymer-derived ceramic routes, namely powder bed fusion and infiltration, fused filament fabrication and replica, and a direct replica of a foamed polymer. A common feature in the processing of these lattices is the use of the same polysilazane as the preceramic source for the Si-C-N-O network that builds up during ceramization. We adopted rotated cube, honeycomb and randomized cellular geometries as a matter of comparison for thermal exchange when an air flow is forced through the structures up to 1050 °C. The three procedural pathways are discussed in their limitations regarding geometry, polymer-to-ceramic conversion, high-temperature heat exchange performance and durability. In this regard, while rotated cube geometry results in the best thermal exchange and highest pressure drop, we show a correlation between chemical composition and high temperature oxidation of the Si-C-N-O network, possibly attributed to the selection of the processing routes. © 2024 The Authorseninfo:eu-repo/semantics/openAccess3D printingFused filament fabricationHeat exchangerPowder bed fusionPreceramic polymerReplicaSilicon oxycarbideArticle2-s2.0-8519354072910.1016/j.oceram.2024.100603