Preparation, cross-linking and ceramization of AHPCS/Cp2ZrCl2 hybrid precursors for SiC/ZrC/C composites
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SiC/ZrC/C composites were prepared via pyrolysis of a polymeric precursor, namely AHPCS/Cp2ZrCl2 hybrid precursor prepared by the blend of allylhydridopolycarbosilane (AHPCS) and bis(cyclopentadienyl) zirconium dichloride (Cp2ZrCl2). The cross-linking and polymer-to-ceramic conversion of as-synthesized AHPCS/Cp2ZrCl2 were characterized by means of FTIR, C-13 NMR, TGA, EDS, Raman spectroscopy and XRD. It is suggested that dehydrocoupling, hydrosilylation and dehydrochlorication are involved in the cross-linking of the hybrid precursor, which is responsible for a relatively high ceramic yield of 75.5% at 1200 degrees C. The polymer-to-ceramic conversion is complete at 900 degrees C, and it gives an amorphous ceramic. Further heating at 1350 degrees C induces partial crystallization, and then the characteristic peaks of p-sic and cubic ZrC appear at 1600 degrees C. The effect of the composition of the hybrid precursor is also studied in the work. Crown Copyright (C) 2012 Published by Elsevier Ltd. All rights reserved.
出处JOURNAL OF THE EUROPEAN CERAMIC SOCIETY，2012,32（10）：1291-1298