Porous SiC ceramics with dendritic pore structures by freeze casting from chemical cross-linked polycarbosilane

In this study, a commercial polycarbosilane (PCS) and divinylbenzene (DVB) were used as the preceramic polymer precursor and crosslinking agent, respectively to form porous silicon carbide (SiC) ceramics by freeze casting DVB/camphene/PCS solutions. Porous silicon carbide (SiC) with a dendritic pore...

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Bibliographic Details
Published in:Ceramics international 2018-04, Vol.44 (6), p.6293-6299
Main Authors: Xue, Fengdan, Zhou, Kechao, Wu, Ning, Luo, Hang, Wang, Xiaofeng, Zhou, Xuefan, Yan, Zhongna, Abrahams, Isaac, Zhang, Dou
Format: Article
Language:English
Subjects:
Divinylbenzene
Freeze casting
Polycarbosilane
Porous structure
SiC
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Summary:In this study, a commercial polycarbosilane (PCS) and divinylbenzene (DVB) were used as the preceramic polymer precursor and crosslinking agent, respectively to form porous silicon carbide (SiC) ceramics by freeze casting DVB/camphene/PCS solutions. Porous silicon carbide (SiC) with a dendritic pore structure and connecting bridges was obtained after pyrolysis at 1200°C. The effects of DVB and PCS content on the rheological properties of the solution and the morphological characteristics and the compressive strengths of SiC ceramics were investigated. The use of DVB and the resulting chemical cross-linking yielded modified pore characteristics and much lower oxygen content in pyrolyzed SiC compared to the conventional thermal curing method. A compressive strength of 18.7MPa was obtained for pyrolyzed SiC prepared with 20wt% PCS and a 0.2 DVB/PCS mass ratio.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2018.01.019