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(A) SiOC-based open cell structure obtained using 20% polysiloxane and 80% expandable microsphere (461DU40). The specimen was pyrolyzed at 1200 °C for 1 h in nitrogen. (B) Typical microstructure of porous SiOC ceramics obtained using 20% polysiloxane and 80% expanded microspheres (461DE20d70). The green compacts were cross-linked at 180 °C in air followed by pyrolysis at 1200 °C for 1 h in nitrogen.
