The effect of ceramic fiber on the rheological and mechanical properties of porous Al2O3 ceramics

Kamrun Nahar Fatema; Hyung Mi Lim; Joung Sook Hong; Kee Sung Lee; Ik Jin Kim

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자료유형: 학술저널

저자정보: Kamrun Nahar Fatema (Hanseo University) Hyung Mi Lim (Korea Institute of Ceramic Engineering & Technology) Joung Sook Hong (Seoul National University) Kee Sung Lee (Kookmin University) Ik Jin Kim (Hanseo University)

저널정보: 한양대학교 세라믹공정연구센터 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제24권 제1호

발행연도: 2023.2

수록면: 197 - 204 (8page)

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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.%.

#Colloidal suspension #Ceramic fiber #Direct foaming #Porous ceramics #Hertzian method

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