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

概要

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Hybrid gels were synthesized from liquid mixtures composed of tetraethyl orthosilicate, titanium tetraisopropoxide and phenolic resin with an acid catalyst addition and a continuous stirring. The gels, prepared with various Ti/Si ratios, were dried, crushed and finally pyrolyzed at 1873 K to yield SiC-TiC powders. Infrared (IR) and nuclear magnetic resonance (NMR) spectra suggested the existence of Si-O-Ti in the precursors pyrolyzed at 773 K, while the precursor before the pyrolysis contained a considerable amount of Si-O-H in addition to Si-O-Ti. The addition of titanium alkoxide in the starting mixture accelerated the final carbothermic reduction rate at 1873 K. A diminished stacking fault structure in the formed SiC crystallites was revealed in SiC-TiC mixed powders.
社団法人日本セラミックス協会の論文
2002-06-01