Microstructure and mechanical properties of oxide based nanocomposites fabricated by spark plasma sintering

Yong Ho Choa, Hirokazu Kawaoka, Tohoru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this study, oxide based nanocomposites fabricated by the SPS method, and SEM and TEM study were carried out to understand the microstructure. Also, to understand mechanical and physical properties of the nanocomposite systems, fracture strength, toughness, young's modulus, and hardness measurement were done. Two kinds of oxide based nanocomposites, MgO/SiC and Al2O3/SiC nanocomposites, were fabricated by SPS method at 1100 to 1800°C in Ar atmosphere with applied pressure of 30MPa. MgO/SiC nanocomposites, in which nano-SiC particles were dispersed within MgO grains, were improved to the fracture toughness of 3.7MPam1/2 and strength of 650Mpa, compared to 320MPa and 2.1MPam1/2, respectively, for MgO monolith. Al2O3/SiC nanocomposites were found to consist of the specific microstructures that fine SiC particles less than 200nm were dispersed within Al2O3 matrix grains and exhibited the fracture toughness of 5.8MPam1/2 and strength of 1200MPa, compared to 700MPa and 3.2MPam1/2, respectively, for Al2O3 monolith. These significant improvements of the mechanical properties were contributed to the change of microstructure due to the dispersion of nanometer-size second phase particles.

Original languageEnglish
Pages (from-to)2009-2012
Number of pages4
JournalKey Engineering Materials
Issue number136 PART 3
Publication statusPublished - 1997

Keywords

  • Fracture Strength
  • Fracture Toughness
  • Nanocomposites
  • Rapid Sintering
  • Spark Plasma Sintering

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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