液态聚硅氧烷交联–成型–热解制备复杂形状硅氧碳-IngentaConnect.PDF

974 2012 40 7 Vol. 40No. 7 2 0 1 2 7 JOURNAL OF THE CHINESE CERAMIC SOCIETY J u l y 2 0 1 2 – – ( 300072) (4001 000 ) SiO SiC SiOC SiC SiO2 TB321 A 0454–5648(2012)07–0974–05 2012–07–03 14:54:47 /kcms/detail/11.2310.TQ1454.201207.974_009.html Fabrication of Macroscopic Complicated-shaped Bulk Silicon Oxycarbide Ceramics from Liquid Polysiloxanes by Crosslink-cast-pyrolysis SU DongAN Haijiao LIU Xiang LIANG Tian LI Yali (Key Laboratory of Advanced Ceramics and Machining Technology (Tianjin University), Ministry of Education, Tianjin 300072, China) Abstract: Liquid casting process is used for the fabrication of net-shaped bulk silicon oxycarbide (SiOC) ceramics from polyhydro- methylsiloxane and tetravinylcycletetrasiloxane through liquid casting, crosslinking and pyrolysis. The shaping, crosslinking and py- rolysis behavior is studied, and the structure and composition evolution of the SiOC ceramics pyrolyzed at high temperature is also studied. This system shows excellent shaping properties allowing the obtaining of macroscopic complicated-shaped bulk SiOC ce- ramics using different material and shape molds followed by pyrolysis. The crosslinked bodies remain intact during the pyrolysis process to obtain the crack-free pyrolyzed bodies at different temperatures (400–1 000 ). The structural analysis suggests that the SiOC ceramic transformed from amorphous SiOC network into nanoceramic containing SiC and SiO nanocrystals through the