Mechanical Properties of La2O3-Al2O3 Ceramics Prepared by Microwave Sintering

Yun Long Ai; Fei He; Bing Liang Liang; Wen He; Wei Hua Chen

doi:10.4028/www.scientific.net/KEM.519.265

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 519Mechanical Properties of La2O3-Al2O3 Ceramics...

Mechanical Properties of La₂O₃-Al₂O₃ Ceramics Prepared by Microwave Sintering

Abstract:

The influence of La2O3 on the phase and microstructure evaluation and mechanical properties of La2O3-Al2O3 ceramics sintered with 2.45 GHz microwave energy was investigated. The results showed that La2O3 could densify the pure alumina with a lower sintering temperature and a short sintering time. La2O3 reacted with Al2O3 to form LaAl11O18 completely and the amount of LaAl11O18 increased with the increasing content of La2O3, distributing at the Al2O3 grain boundaries. The specimen doped with 10 vol.% and 15 vol.% La2O3 sintered at 1500 °C exhibited plenty of columnar grains with draw ratio about 1:4. The existence of columnar grains enhanced the microhardness and fracture toughness of La2O3-Al2O3 ceramics.

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Key Engineering Materials (Volume 519)

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265-268

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.519.265

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Online since:

July 2012

Authors:

Yun Long Ai, Fei He, Bing Liang Liang, Wen He, Wei Hua Chen

Keywords:

Al₂O₃, Columnar Crystals, Fracture Toughness, La₂O₃, Microwave Sintered

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