Additive and pyrolysis atmosphere effects on polysiloxane-derived porous SiOC ceramics

摘要: Abstract Porous silicon oxycarbide (SiOC) is emerging as a much superior ultrahigh surface area material that can be stable up to high temperatures with great tailorability through composition and additive modifications. In this study, bulk SiOCs were fabricated from base polysiloxane (PSO) system by using different organic additives pyrolysis atmospheres followed hydrofluoric acid (HF) etching. The modify the microstructural evolution influencing SiO 2 nanodomain formation. SiOC ceramics contain significantly less SiC more Ar + H O atmosphere compared Ar pyrolysis. Water vapor injection during also causes drastic increase in specific areas. addition of 10 wt% tetraethyl orthosilicate (TEOS) produces 1953.94 m /g, 880.09 m /g for PSO pyrolyzed Ar. fundamental processes phase evolutions are discussed novel pathway creating materials. ability drastically use presents promising processing route highly porous ceramics.