Centrifugal slip casting in prefabricated template was used to prepare open-cell Al2O3 foams. Aqueous α- Al2O3 slurries with up to 50% solid contents (volume fraction) were prepared. The sedimentation of slurries during centrifugation was discussed with respect to the hydronamic conditions at large particle concentrations. The effect of solid contents on mass segregation was observed. Segregation phenomena were hindered for slurries with high solid loadings exceeding 50% ( volume fraction). The dried and sintered behaviors of samples were analyzed. The cell struts in green bodies had good particles packing and showed high green density ( 63.4% theory density ). After sintered at 1500 ℃, the cell struts of final products had high sintered density ( 98. 8% theory density) and homogeneous microstructure. The porosity of final products is 75.6%
Centrifugal slip casting in prefabricated template was used to prepare open-cell Al2O3 foams. Aqueous α- Al2O3 slurries with up to 50% solid contents (volume fraction) were prepared. The sedimentation of slurries during centrifugation was discussed with respect to the hydronamic conditions at large particle concentrations. The effect of solid contents on mass segregation was observed. Segregation phenomena were hindered for slurries with high solid loadings exceeding 50% ( volume fraction). The dried and sintered behaviors of samples were analyzed. The cell struts in green bodies had good particles packing and showed high green density ( 63.4% theory density ). After sintered at 1500 ℃, the cell struts of final products had high sintered density ( 98. 8% theory density) and homogeneous microstructure. The porosity of final products is 75.6%
于景媛;李然;李强;李晓东;孙旭东
东北大学School of Material & Metallurgy, Northeastern University, Shenyang 110004, ChinaCollege of Materials & Chemical Engineering, Liaoning Institute of Technology, Jinzhou 121001, China
化学化工
centrifugal slip casting;template;settling velocity;mass segregation
centrifugal slip casting;template;settling velocity;mass segregation
《材料与冶金学报》 2006 (004)
268-270,275 / 4
国家杰出青年基金(50425413);国家自然科学基金(50672014).
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