Preparation and Characterization of SiO2/SiCN Core-shell Ceramic Microspheres
ZHANG Hai-yuan1,2, LIU Hong-li1,2, LI Jing2, KANG Wei2
1. Tianjin Key Laboratory of Soft Soil Characteristics and Engineering Environment, Tianjin 300384, China;
2. School of Materials Science and Engineering, Tianjin Chengjian University, Tianjin 300384, China
Abstract：The SiO2/PSN core-shell microspheres were prepared via an emulsion reaction combined with the polymer-derived ceramics (PDCs) method using polysilazane (PSN) in situ polymerization on the surface of SiO2 modified by silane coupling agents MPS, followed by pyrolysis process to obtain SiO2/SiCN core-shell ceramic microspheres. The effects of raw mass ratio, curing time and pyrolysis temperature on the formation and the morphology of core-shell microspheres were studied. The morphology, chemical composition and phase transformation were characterized by SEM, EDS, TEM, FT-IR and XRD. The results show that after reaction for 4h at 200℃, SiO2 completely coated PSN forms a core-shell microsphere with rough surface when the mass ratio of SiO2 and PSN is 1:4; when pyrolysis temperature is at 800-1200℃, amorphous SiO2/SiCN core-shell ceramic microspheres are prepared; at 1400℃, the amorphous phase partially crystallizes to produce SiO2, SiC and Si3N4 phase.
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