Effect of the heating rate on the spark-plasma-sintering (Sps) of transparent y2 o3 ceramics: Microstructural evolution, mechanical and optical properties

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

High strength transparent Y2 O3 ceramics were fabricated from commercial powders using spark plasma sintering (SPS) technique by optimizing the heating rate. The heating rate significantly influenced the microstructures and the optical/mechanical properties of the Y2 O3 ceramics. Grain growth was limited accordingly with increasing the heating rate. The ball milling process of the commercial Y2 O3 powders is likely to further enhance the sinterability during the SPS processing. The dense Y2 O3 ceramics, which were sintered by SPS with 100 C/min, showed good transmittance range from visible to near infrared (IR). For a high heating rate of 100 C/min, the in-line transmittance at a visible wavelength of 700 nm was 66%, whereas for a slow heating rate of 10 C/min, it reduced to 46%. The hardness Hv tends to increase with increasing the heating rate and rigorously followed the Hall–Petch relationship; that is, it is enhanced with a reduction of the grain size. The toughness KIC, on the other hand, is less sensitive to both the heating rate and the grain size, and takes a similar value. This research highlighted that the high heating rate SPS processing can fabricate fully dense fine-grained Y2 O3 ceramics with the excellent optical and mechanical properties.

Original languageEnglish
Pages (from-to)56-69
Number of pages14
JournalCeramics
Volume4
Issue number1
DOIs
Publication statusPublished - 2021 Mar
Externally publishedYes

Keywords

  • Heating rate
  • Mechanical properties
  • Optical properties
  • Spark plasma sintering
  • Transparent ceramics
  • Y O

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Science (miscellaneous)

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