Effects of the size distribution of SiC powders on the microstructures and properties of liquid phase bonded porous SiC with neck bonding phases of Y4Al2O9, Y3A5O12, Y2Si2O7, and Al2O3

Sung Il YUN, Sahn NAHM, Sang Whan PARK

Research output: Contribution to journalArticlepeer-review

Abstract

Liquid phase bonded (LPB) porous SiC with neck bonding phases consisting of yttrium aluminate (Y4Al2O9, Y3Al5O12), yttrium silicate (Y2Si2O7), and Al2O3 were fabricated using varying amounts of an Al2O3Y2O3SiO2 bonding additive in Ar at 1500 °C for 1 h. LPB porous SiC ceramics exhibited unimodal pore-size distributions, porosities of 36.644.8%, and pore sizes of 7.78.5 μm. The particle-size distribution of SiC powders was an important factor in determining the pore characteristics, including pore-size distribution, pore shape, porosity, and pore size, and the flexural strength as well as the gas permeability of LPB porous SiC ceramics. The porosity and pore size increased, and the pore-size distribution narrowed by using SiC powders with a narrow size distribution. The flexural strength of porous SiC varied in the range of 39.766.7MPa and was mainly dependent on the porosity, pore shape, pore size, and solid boning area varied by the SiC particle-size distribution. A relatively high permeability (1.281.84 × 10-12m2) of LPB porous SiC was attained mainly due to the unimodal pore size distribution of pores with sizes of 7.78.5 μm.

Original languageEnglish
Pages (from-to)660-668
Number of pages9
JournalJournal of the Ceramic Society of Japan
Volume129
Issue number11
DOIs
Publication statusPublished - 2021 Nov 1

Keywords

  • Flexural strength
  • Particle size distribution
  • Permeability
  • Porous SiC
  • Reaction bonding

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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