Evolution of microstructure, mechanical, and optical properties of Y2O3-MgO nanocomposites fabricated by high pressure spark plasma sintering

Lihong Liu, Koji Morita, Tohru S. Suzuki, Byung Nam Kim

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A high-pressure spark plasma sintering (SPS) process was applied for consolidating Y2O3–MgO nanocomposites. This approach enabled to fabricate a fully dense infrared (IR) transparent nanocomposites, which possess an average grain size of ∼70 nm and high hardness, at a relatively low sintering temperature of 1130 °C under a high pressure of 300 MPa. The light transmittance was improved with increasing pressure and reached to the maximum transmittance of 64.5% at a wavelength of 0.2–1.6 μm owing to the fine-grained microstructure. The Vickers hardness exhibited 16.6 ± 0.7 GPa for the grain size of 74 nm, which is significantly higher than that of the sub-micro grains obtained at a conventional sintering pressure of 70 MPa (11.9 ± 0.8 GPa). The hardness rigorously followed the Hall–Petch relationship, that is, it is enhanced with a reduction of the grain size. Successful fabrication of the high-performance Y2O3–MgO nanocomposites indicates that the nanopowder processing followed by the high-pressure sintering process can be applied for fabricating fully dense fine-grained nanocomposites with excellent optical and mechanical properties.

Original languageEnglish
Pages (from-to)4547-4555
Number of pages9
JournalJournal of the European Ceramic Society
Volume40
Issue number13
DOIs
Publication statusPublished - 2020 Oct

Keywords

  • High pressure
  • IR-transmittance
  • Mechanical properties
  • SPS sintering
  • YO–MgO nanocomposites

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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