Preparation of Al2O3–ZrO2–SiO2 ceramic composites by high-gravity combustion synthesis |
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Affiliation: | 1. Technical Institute of Physics and Chemistry, Key Laboratory of Functional Crystals and Laser Technology, Chinese Academy of Sciences, Beijing 100190, China;2. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | 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. |
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