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Naji, M. |
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Motta, Antonella |
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Aletan, Dirar |
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Mohamed, Tarek |
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Ertürk, Emre |
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Taccardi, Nicola |
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Petrov, R. H. | Madrid |
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Alshaaer, Mazen | Brussels |
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Bih, L. |
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Casati, R. |
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Kočí, Jan | Prague |
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Kalteremidou, Kalliopi-Artemi | Brussels |
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Azam, Siraj |
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Ospanova, Alyiya |
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Blanpain, Bart |
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Ali, M. A. |
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Popa, V. |
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Rančić, M. |
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Ollier, Nadège |
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Azevedo, Nuno Monteiro |
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Landes, Michael |
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Torres, Pmc
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article
Hydrolysis-induced aqueous gelcasting for near-net shape forming of ZTA ceramic composites
Abstract
A new near-net shape forming process called "hydrolysis-induced aqueous gelcasting" (GCHAS) is reported in this paper for the consolidation of ZTA composites, ZTA-30 (70 wt.% Al(2)O(3) + 30 wt.% ZrO(2)) and ZTA-60 (40 wt.% Al(2)O(3) + 60 wt.% ZrO(2)). For comparison purposes, ceramics having the same chemical compositions were also consolidated by hydrolysis-assisted solidification (HAS). All the starting suspensions contained a solids loading of 50 vol.%. In the precursor powder mixtures, 1-5 wt.% of Al(2)O(3) was replaced by equivalent amounts of AIN to enhance or promote or co-promote the consolidation of suspensions by HAS or by GCHAS, respectively. The suspensions for GCHAS were prepared by dispersing the ZTA powder precursor mixtures in a premix solution of 20 wt.% MAM (methacrylamide), MBAM (methylenebisacrylamide) and NVP (n-vinylpyrrolidinone) in 3:1:3 ratio in de-ionized water. Ceramics consolidated via GCHAS exhibited superior mechanical properties after consolidation and after sintering for 1 h at 1600 degrees C in comparison to those consolidated by HAS.