Influence of La₂O₃ Addition on Microstructure and Mechanical Properties of Al₂O₃ Ceramics

Abstract:

In this paper, alumina ceramics were prepared with alumina powder and lanthanum nitrate. The influence of La₂O₃ on the microstructure and properties of alumina ceramics were studied. The result showed that the addition of La₂O₃ contributed to the mechanical property of the samples. The alumina ceramics with adding of 0.05wt% La₂O₃ sintered at 1490°C had the best mechanical properties. And the flexural strength, fracture toughness of the ceramics could reach 571.902MPa and 5.82MPa•m^1/2，which were improved by 37.55% and 10.65% respectively compared with the alumina ceramics without La₂O₃. Besides, the average grain size of alumina ceramic is about 2.8μm, and the effect of inhibition on grain growth of alumina ceramics was obvious.

• Periodical: Materials Science Forum (Volume 956)
• Pages: 69-77
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.956.69
• Online since: June 2019
• Authors: Xing Ze Ge*, Qi Ge, Xing Shuo Ge, Deng Hui Ji, Ying Huang, Zhong Lun Zhang, Hong Bo Zhang
• Keywords: Alumina Ceramic, Grain Refining, Lanthanum Oxide, Mechanical Properties

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