4.5 Article

Fabrication of high-strength transparent MgAl2O4 spinel polycrystals by optimizing spark-plasma-sintering conditions

Journal

JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 9, Pages 2863-2872

Publisher

CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0335

Keywords

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Funding

  1. Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [19760497]
  2. World Premier International Research Center Initiative (WPI Initiative)
  3. Amada Foundation [AF2008016]
  4. Grants-in-Aid for Scientific Research [19760497] Funding Source: KAKEN

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By optimizing the heating rate during spark-plasma-sintering (SPS) processing, a high-strength transparent spinel (MgAl2O4) can be successfully fabricated for only a 20-min soak at 1300 degrees C. For the heating rates of <= 10 degrees C/min, the spinel exhibits an excellent combination of in-line transmission (50-70%), four-point-bending strength (>400 Mpa), and hardness (>15 GPa). The excellent optical and mechanical properties can be ascribed to the superimposed effects of the sub-micrograin size, fine-pore size, and low porosity, which are related closely to the heating rate during the SPS processing. The present study demonstrates that to attain a high-strength transparent spinel at low temperatures and short sintering times, the low-heating-rate SPS processing is more efficient compared with the high-heating-rate SPS processing.

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