LI Jiake, LIU Xin, FANG Wenmin, GUO Pingchun, WANG Yanxiang
(School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333043, Jiangxi, China)

Abstract: SiOC bulk porous ceramics were prepared by pyrolysis the cross-linked in nitrogen at 600-1000 °C the cross-linked body was synthesized at 80 °C for 10 hours with hydrogen-containing polysiloxane (PHMS) as the base material, tetramethyl-tetravinylcycletetrasiloxane (D4Vi) as the cross-linking agent, polydimethylsiloxane (PDMS) as the crack inhibitor, Pt complex as the catalyst, and the nuts powder as the pore-forming agent. The thermal evolution of the cross-linked body, the effects of the pyrolysis temperature and the adding content of the pore-forming agent on the phase composition, microstructure, specific surface area and porosity of SiOC ceramic were investigated by DSC,XRD, SEM, BET, etc. The results show that the SiOC porous ceramics are amorphous when the pyrolysis temperature is 600-1000 °C with their pore sizes distributed between 50 nm-300 nm and their porosity between 5.75-19.33%. When the pyrolysis temperature is 800 °C, the asprepared SiOC porous ceramic without adding the nuts powder owns the specific surface area of 40.46 m²/g and the porosity of 9.45%. When the adding content of the nuts powder is 15%, the as-prepared SiOC porous ceramic owns the specific surface area of 86.49 m²/g and the porosity of 19.33 %.

Key words: SiOC ceramics; porosity; nuts powder; microstructure