Synthesis and characterization of ceramic precursor aluminum-containing polycarbosilane and its pyrolysis
Yu, Y. X.
Yang, J. M.
- 材料学院－已发表论文 
The aluminum-containing polycarbosilane (Al-PCS) was synthesized by reaction of an aluminum alkoxide with polycarbosilane (PCS). The Al-PCS product was characterized by element analysis, gel permeation chromatography (GPC), as well as Fourier transform (FT-IR) and nuclear magnetic resonance (H-1, Si-29, C-13, and Al-27 NMR) spectroscopy. The results show that Al-PCS is very similar to PCS in structure. This preceramic precursor is described as a dispersion of Al(AcAc)(3)-based particles in the PCS chain matrix. The pyrolysis process of Al-PCS was investigated by thermogravimetry (TG), FT-IR, and X-ray diffraction (XRD). The pyrolysis of Al-PCS includes three sequential stages: First, the condensation and thermal decomposition into the inorganic state; second, the transition toward the third stage involving the thermal decomposition of the side chains into an amorphous state; third, the crystallization of beta-SiC.