Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 41, Issue -, Pages 622-626Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2013.04.015
Keywords
Ceramics; Composites; High-gravity combustion synthesis; Hardness
Funding
- National Natural Science Foundation of China [50932006, 51002163, 51001111]
- Beijing Natural Science Foundation [2112043]
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By a furnace-free technique of high-gravity combustion synthesis, Al2O3-ZrO2-SiO2 ceramic composites were prepared via melt solidification instead of conventional powder sintering. The solidification kinetics and microstructure evolution of the ceramic composites in high-gravity combustion synthesis were discussed. The phase assemblage of the ceramic composites depended on the chemical composition, where both (Al2O3 + ZrO2) and (mullite + ZrO2) composites were obtained. The ceramic composites consisted of ultrafine eutectics and sometimes also large primary crystals. In the (mullite + ZrO2) composites, two different morphologies and orientations were observed for the primary mullite crystals, and the volume fraction of mullite increased with increasing SiO2 content The ceramic composites exhibited a hardness of 11.2-14.8 GPa, depending on the chemical composition and phase assemblage. (C) 2013 Elsevier Ltd. All rights reserved.
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