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

  • Kamrun Nahar Fatemaa, Hyung Mi Limb, Joung Sook Hongc, Kee Sung Leed and Ik Jin Kima,*

  • aInstitute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University, Chungcheongnam-do 31962, Korea
    bKorea Institute of Ceramic Engineering & Technology (KICET), Jinju 52851, Korea
    cSchool of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Korea
    dSchool of Mechanical Engineering, Kookmin University, Seoul 02707, Korea

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Porous ceramics having oriented pores find widespread use in filtration, insulation, biomaterials, and catalysis. Because of the shape of the interconnected pores, porous alumina (Al2O3) ceramics synthesized via direct foaming have poor mechanical strength. The physical and mechanical characteristics of porous Al2O3 ceramics were systematically explored in this work by modulating the microstructure and rheological properties by the inclusion of ceramic fibers. Because of the incorporation of ceramic fibers, the fiber-containing wall structure is generated in porous ceramics. The physical properties and mechanical strength of porous ceramics increase as the fiber content increases. To stabilize the wet foam and enhance the mechanical properties 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 compressive strength, however excess fibers reduce compressive strength. The load-bearing capacity and elastic modulus of sintered samples were determined using the Hertzian indentation method. The load-bearing capacity and elastic modulus increased from 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.%.


Keywords: Colloidal suspension, Ceramic fiber, Direct foaming, Porous ceramics, Hertzian method

This Article

  • 2023; 24(1): 197-204

    Published on Jan 3, 2023

  • 10.36410/jcpr.2023.24.1.197
  • Received on Sep 21, 2022
  • Revised on Dec 17, 2022
  • Accepted on Dec 17, 2022

Correspondence to

  • Ik Jin Kim

  • Institute of Processing and Application of Inorganic Materials (PAIM), Department of Materials Science and Engineering, Hanseo University, Chungcheongnam-do 31962, Korea
    Tel : +82-41-660-1441 Fax: +82-41-660-1441

  • E-mail: ijkim@hanseo.ac.kr, keeslee@kookmin.ac.kr