Effect of Nb2O5/La2O3 Additions on Mechanical Properties of Al2O3 Ceramics Prepared by Microwave Sintering

Yun Long Ai; Nan Jiang; Fei He; Bing Liang Liang; Wen He

doi:10.4028/www.scientific.net/KEM.544.281

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 544Effect of Nb2O5/La2O3 Additions on Mechanical...

Effect of Nb₂O₅/La₂O₃ Additions on Mechanical Properties of Al₂O₃ Ceramics Prepared by Microwave Sintering

Abstract:

The influence of Nb2O5 and La2O3 on the phase and microstructure evaluation and mechanical properties of composite ceramics sintered with 2.45 GHz microwave energy was investigated. The results showed that Nb2O5 could densify the pure alumina with a lower sintering temperature and a short sintering time. Nb2O5 reacted with Al2O3 to form AlNbO4 completely and the amount of AlNbO4 increased with the increasing content of Nb2O5, distributing at the Al2O3 grain boundaries. The specimen doped with 10 Vol.% Nb2O5 sintered at 1500 °C exhibited plenty of columnar grains with draw ratio about 1:3. La2O3 reacted with Al2O3 to form LaAl11O18 completely, 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 composite ceramics.

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Key Engineering Materials (Volume 544)

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281-285

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.544.281

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Online since:

March 2013

Authors:

Yun Long Ai, Nan Jiang, Fei He, Bing Liang Liang, Wen He

Keywords:

Al₂O₃, Columnar Crystals, La₂O₃, Microwave Sintered, Nb₂O₅

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