Journal
CERAMICS INTERNATIONAL
Volume 39, Issue 4, Pages 4163-4170Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.10.272
Keywords
Nanocomposites; Mechanical properties; Zirconia; Mullite; Precursor transformation
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Funding
- China Scholarship Council
- national 863 plans of China
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The objective of this research is to study microstructure and phase evolution of zirconia-mullite (ZM) nanocomposites which were synthesized by the direct transformation from amorphous precursor monoliths. The monolithic precursors were heat treated at 950-1250 degrees C to obtain ZM composites. Scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were employed to investigate the microstructure of the composites. A unique nano- and submicron-zirconia co-reinforced mullite composite microstructure was obtained after a controlled crystallization. The nano tetragonal zirconia (t-ZrO2) grains (<50 nm) were spherical and embedded in the mullite lattice. The unconfined zirconia grains showed a preferred growth direction along < 1 0 0 > direction of t-ZrO2, and formed submicron grains (< 650 nm) with bar-like shape. The precursor derived ZM composites also demonstrated enhanced mechanical properties comparing with the conventional powder processed ZM composites. (C) 2013 Published by Elsevier Ltd and Techna Group S.r.l.
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