Synthesis and Characterization of SiC Ceramic Precursor with High Boron Content

doi:10.7503/cjcu20130520

Abstract

Abstract:

Polyboroncarbosilane(PBCS) was synthesized via hydroboration BH₃·SMe₂ and dimethyldivinylsilane(DVS) as starting materials. SiC ceramics with high boron content were obtained by pyrolysis of PBCS in N₂. The structures and properties of the polymers were investigated via FTIR, NMR, TGA; and their pyrolytic products were investigated via elemental analysis, X-ray diffraction and SEM. The results indicate that B—C, Si—C, C—H bonds exist in the structure of PBCS; and ceramic yields for the precursor in N₂ are up to 50%. The ceramics exist in amorphous state with the B content of 6.46% after pyrolyzed at 1100℃, and crystallize distinctly to form a multiple phases of B₂O₃, C and β-SiC at 1300℃. The results show a glazed surface and a dense structure when treated below 1500℃.

Key words: Hydroboration, Polyboroncarbosilane, Pyrolysis, Polymer derived ceramics

CLC Number:

O631
TQ343

TrendMD:

ZHU Yi-Hua, WANG Hao, SHAO Chang-Wei. Synthesis and Characterization of SiC Ceramic Precursor with High Boron Content[J]. Chem. J. Chinese Universities, 2013, 34(10): 2415.

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