Journal
JOURNAL OF MATERIALS RESEARCH
Volume 24, Issue 9, Pages 2863-2872Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0335
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan [19760497]
- World Premier International Research Center Initiative (WPI Initiative)
- Amada Foundation [AF2008016]
- 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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