Microstructure and mechanical properties of Al2O3-MgB2 composites

The microstructure and mechanical properties of Al2O3-5 wt% MgB2 composites were studied by SEM and Vickers hardness measurements. It was shown that MgO whiskers can grow at temperatures as low as 950 C. When sintered at 1450 C, due to the strong vaporisation of Mg, MgO and MgAl2O4 appear around Al2...

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Bibliographic Details
Published in:Ceramics international 2005, Vol.31 (1), p.105-108
Main Authors: LU, Hong-Xia, SUN, Hong-Wei, LI, Guo-Xing, CHEN, Chang-Ping, YANG, De-Lin, XING HU
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Cermets, ceramic and refractory composites
Chemical industry and chemicals
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Other materials
Physics
Specific materials
Structural ceramics
Technical ceramics
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Summary:The microstructure and mechanical properties of Al2O3-5 wt% MgB2 composites were studied by SEM and Vickers hardness measurements. It was shown that MgO whiskers can grow at temperatures as low as 950 C. When sintered at 1450 C, due to the strong vaporisation of Mg, MgO and MgAl2O4 appear around Al2O3 grains. The microstructure of the Al2O3-5 wt% MgB2 differs remarkably from Al2O3 sintered at the same temperature. The fracture toughness of the Al2O3-5% MgB2 composite is 4.0 MPa.m1/2, which is slightly higher than that for pure Al2O3 ceramics. 12 refs.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2004.03.040