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(A) Macroporous cellar structure of SiC ceramics after pyrolysis of polysilane-infiltrated polyurethane (PU) foams (reproduced with permission from [59] © 2000 Springer). (B) The crack-free SiOC–C ceramic structure developed using extracted, maleic acid anhydrate (MA)-modified and polymethylhydrosiloxane (PMHS)-infiltrated pine wood compounds after pyrolysis at 800 °C in a nitrogen atmosphere (reproduced with permission from [54] © 2004 Elsevier).
