セリア被覆アルミナ長繊維/アルミナマトリックス複合材料のプロセッシング

概要

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The surface of alumina and silica-alumina fibers was coated with ceria to avoid the sintering between the fibers and alumina matrix and to promote the pull-out of fibers in the oxide fibers/alumina matrix composites. A cerium nitrate solution of 0.25-0.50 M at pH 2.0-6.0 was infiltrated into the spaces of woven fabric of the oxide fibers. The infiltrated cerium nitrate was thermally decomposed at 400℃ in air to form a cerium oxide layer. No reaction was observed in the X-ray diffraction patterns for the alumina-ceria system at 1300-1500℃. In the alumina-silica-ceria system, α-alumina, mullite(3Al_2O_3・2SiO_2)and ceria coexisted at 1300-1500℃ in air. The ceria-coated alumina fabric was immersed in a well-dispersed alumina suspension of 15-25 vol% solid to form the alumina matrix. The treated fabric of 16 sheets was hot-pressed at 1200℃ to produce a dense composite of ceria-coated alumina fiber(47.5-56.6vol%)/almina matrix(43.4-52.5vol%)with 98.4% of the theoretical density. These composites fractured in the absence of plastic deformation.
社団法人日本セラミックス協会の論文
2000-09-01