フェノール樹脂-アルコキシドハイブリッド前駆体の熱分解によるSiC-TiC複合粉末の合成

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  • Synthesis of SiC-TiC Powders by Pyrolysis of Phenolic Resin-Alkoxides Hybrid Precursors.

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IR and NMR spectra suggest the existences of the TiQ3 (Si-O-Ti) in the prepared precursor. Quantitative estimation of the 29Si NMR spectra reveals that TiQ3 ratio in the silicon atom coordination is saturated at ca. 10mol%. Beyond the Ti/Si rario of 0.2, the formation of anatase is suggested. The addition of titanium in the system accelerates carbothermic reduction at 1873K, which have been finished at 0.5-1.5ks. The TEM micrographs of the powders indicate the aggregated grains consisting of the SiC and TiC crystallites (50-100nm in crystallite diameters). The size and morphology of TiC crystallites are almost the same as those of SiC in appearance. In the 0.4Ti powder, however, number of elliptic SiC crystallites possessing the disordered lamella patterns decrease. Thus the XRD lines of SiC are sharpened and are separated out from those of TiC. The SiO2-TiO2 liquid phase formation during the heat treatment at 1873K is suggested to play an important role in the carbothermic reduction process which yields the SiC-TiC powders.

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