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Microstructure and Properties of Zirconia-Mullite Nanocomposites Obtained from Si-Al-Zr-O Amorphous Bulks Doped with CaO and MgO

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Abstract:

Zirconia-mullite nanocomoposites were prepared from Si-Al-Zr-O amorphous bulk with diffrent content of CaO and MgO by two-step thermal treatment between 900 and 1200°C. The effects of the additives on the phase and microsturcture were studied by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results show that the addition of CaO promotes cristobalite phase formation and the anisotropic growth of mullite grains. An indention micro-crack method was used to measure the fracture toughness of zirconia-mullite nanocomoposites. The results demonstrate that the fracture toughness increases with higher concentration of CaO. The improvement of fracture toughness is attributed to the anisotropic growth of grains.

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Periodical:

Applied Mechanics and Materials (Volume 142)

Pages:

87-91

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.142.87

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Online since:

November 2011

Authors:

Xiao Ping Tan, Shu Quan Liang, Li Yuan Chai

Keywords:

Mechanical Property, Microstructure, Nanocomoposites, Zirconia-Mullite

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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