Effects of Nb2O5/La2O3 Synergistic Modification on Phase Composition, Microstructure and Mechanical Properties of Al2O3 Ceramics Prepared by Microwave Sintering

Yun Long Ai; Kai Wu; Xiang Hua Xie; Bing Liang Liang; Wen He; Wei Hua Chen

doi:10.4028/www.scientific.net/KEM.633.49

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 633Effects of Nb2O5/La2O3 Synergistic Modification on...

Effects of Nb₂O₅/La₂O₃ Synergistic Modification on Phase Composition, Microstructure and Mechanical Properties of Al₂O₃ Ceramics Prepared by Microwave Sintering

Abstract:

Nb₂O₅-7.5La₂O₃-Al₂O₃ composite ceramics were prepared by microwave sintering. The influence of Nb₂O₅ and La₂O₃ proportion on the microstructure and mechanical properties of Al₂O₃ ceramics was investigated. The results show that when the Nb₂O₅ content was lower than La₂O₃, the columnar LaAl₁₁O₁₈ grains were generated by the reaction of La₂O₃ with Al₂O₃. When the Nb₂O₅content was higher than La₂O₃, the surplus Nb₂O₅ induced the formation of columnar Al₂O₃ grains. The growth of columnar Al₂O₃ grains were promoted synergistically by LaNbO₄ formed in-situ and Nb₂O₅. The 5Nb₂O₅-7.5La₂O₃-Al₂O₃ composite ceramic exhibited excellent comprehensive properties: ρ_r=99.3% (relative density), HV=11.2GPa (microhardness), K_IC= 6.4MPa·m^1/2 (fracture toughness), σ=304.3MPa (bending strength).

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Key Engineering Materials (Volume 633)

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49-52

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.633.49

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November 2014

Authors:

Yun Long Ai*, Kai Wu, Xiang Hua Xie, Bing Liang Liang, Wen He, Wei Hua Chen

Keywords:

Al₂O₃ Composite Ceramics, Columnar Grains, Microwave Sintering, Nb₂O₅/La₂O₃ Modification

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