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Koranian S, Gohar Geranbaha M, Tavakoli H. Fabrication of alumina ceramic and alumina-zirconia ceramic composite with yttria-stabilized zirconia by gelcasting method. Jicers 2021; 16 (4) :25-31
URL: http://jicers.ir/article-1-313-en.html

In recent years gelcasting has been considered as a novel, simple and optimal method for making of complex ceramic parts. This method is a combination of polymer chemistry and slip processing in which a suspension of ceramic powders and organic monomers poured in to a mold to form a green body in the shape of mold cavity by undergoing an in-situ polymerization. A lot of studies have been conducted on rheological aspects of gelcasting suspensions, but there are not enough data published for physical and mechanical properties of alumina-zirconia ceramic composites produced by gelcasting. In this research alumina ceramic (A100) with solid loading of 45 vol.% and alumina-zirconia ceramic composite (A90-Z10) with solid loading of 45 vol.% containing 90 vol.% alumina and 10 vol.% yttria stabilized zirconia were fabricated by gelcasting method and green bodies sintered at 1650°C. X-ray diffraction pattern confirms tetragonal phase of zirconia in alumina-zirconia ceramic composite. SEM results show a uniform microstructure in both fabricated ceramics of A100 and A90-Z10. SEM results for alumina-zirconia ceramic composite show well-dispersed zirconia particles in alumina microstructure. Relative density results confirm that it is possible to reach a high value for alumina-zirconia composite (89.7%) with gelcasting method. Results for mechanical properties show that well-dispersed zirconia in alumina can increase its bending strength (+13.27%) and fracture toughness (+28.94%) in comparison to pure alumina ceramic fabricated with same method. On the other hand, alumina-zirconia ceramic composite hardness is reduced by 9.7% in comparison to pure alumina ceramic.