Effects of SiC particle size on flexural strength, permeability, electrical resistivity, and thermal conductivity of macroporous SiC

Sung Il Yun, Sahn Nahm, Sang Whan Park

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, macroporous SiC ceramics were fabricated via in situ liquid-phase bonding using an Al2O3–Y2O3–SiO2 bonding additive at 1500 °C. The pore size of the ceramics was successfully varied from 7.8 to 45.5 μm by increasing the SiC particle size from 37.6 to 262.6 μm, without changing the porosity. The effects of the SiC particle size and pore size on the flexural strength, permeability, and electrical resistivity of the ceramics were investigated. The pore size and SiC particle size significantly affected the properties of the macroporous SiC. With an increase in the pore size and SiC particle size, the flexural strength and electrical resistivity of the ceramics decreased significantly, while the permeability and the thermal conductivity increased considerably. The porous SiC with a pore size of 45.5 μm and a porosity of 37.8% exhibited a high permeability of 21.2 × 10−12 m2, relatively high flexural strength of 20.6 MPa, moderate electrical resistivity of 3.8 × 105 Ω cm, and high thermal conductivity of 66.4 Wm−1K−1.

Original languageEnglish
Pages (from-to)1429-1438
Number of pages10
JournalCeramics International
Volume48
Issue number1
DOIs
Publication statusPublished - 2022 Jan 1

Keywords

  • Electrical resistivity
  • Flexural strength
  • Liquid phase bonding
  • Permeability
  • Porous SiC
  • Thermal conductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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