The effect of ceramic fiber on the rheological and mechanical properties of porous Al2O3 ceramics
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Porous ceramics having oriented pores find widespread use in filtration, insulation, biomaterials, and catalysis. Because of theshape of the interconnected pores, porous alumina (Al2O3) ceramics synthesized via direct foaming have poor mechanicalstrength. The physical and mechanical characteristics of porous Al2O3 ceramics were systematically explored in this work bymodulating the microstructure and rheological properties by the inclusion of ceramic fibers. Because of the incorporation ofceramic fibers, the fiber-containing wall structure is generated in porous ceramics. The physical properties and mechanicalstrength of porous ceramics increase as the fiber content increases. To stabilize the wet foam and enhance the mechanicalproperties of the porous ceramics, ceramic fibers are added to the Al2O3 colloidal suspension. With 2.0 wt.% ceramic fibers,wet foam stability of 84% was obtained. Adequate addition of 2.0 wt.% ceramic fibers in the slurry may improve compressivestrength, however excess fibers reduce compressive strength. The load-bearing capacity and elastic modulus of sinteredsamples were determined using the Hertzian indentation method. The load-bearing capacity and elastic modulus increasedfrom 65.35 to 235.45 N and 28.52 to 270.75 MPa, respectively, as the ceramic fiber content increased from 0.5 to 3.0 wt.%.
Abstract
Porous ceramics having oriented pores find widespread use in filtration, insulation, biomaterials, and catalysis. Because of theshape of the interconnected pores, porous alumina (Al2O3) ceramics synthesized via direct foaming have poor mechanicalstrength. The physical and mechanical characteristics of porous Al2O3 ceramics were systematically explored in this work bymodulating the microstructure and rheological properties by the inclusion of ceramic fibers. Because of the incorporation ofceramic fibers, the fiber-containing wall structure is generated in porous ceramics. The physical properties and mechanicalstrength of porous ceramics increase as the fiber content increases. To stabilize the wet foam and enhance the mechanicalproperties of the porous ceramics, ceramic fibers are added to the Al2O3 colloidal suspension. With 2.0 wt.% ceramic fibers,wet foam stability of 84% was obtained. Adequate addition of 2.0 wt.% ceramic fibers in the slurry may improve compressivestrength, however excess fibers reduce compressive strength. The load-bearing capacity and elastic modulus of sinteredsamples were determined using the Hertzian indentation method. The load-bearing capacity and elastic modulus increasedfrom 65.35 to 235.45 N and 28.52 to 270.75 MPa, respectively, as the ceramic fiber content increased from 0.5 to 3.0 wt.%.
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