Hydrolysis-induced aqueous gelcasting for near-net shape forming of ZTA ceramic composites |
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| Authors: | Ibram Ganesh Susana M. Olhero Paula M.C. Torres Fernando J. Alves José M.F. Ferreira |
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| Affiliation: | 1. Centre for Advanced Ceramics, International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Hyderabad 500005, Andra Pradesh, India;2. Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Aveiro P-3810193, Portugal;3. Department of Mechanical Engineering and Industrial Management, FEUP, University of Porto, Porto, Portugal;1. Department of Orthopedic Surgery, Osaka University Medical School, 2-2 Yamadaoka, Suita, 565-0871 Osaka, Japan;2. Ceramic Physics Laboratory and Research Institute for Nanoscience, Kyoto Institute of Technology, Sakyo-ku, Matsugasaki, 606-8585 Kyoto, Japan;3. Piezotech Japan Ltd., Mukaibata-cho 4, Ichijoji, Sakyo-ku, 606-8326 Kyoto, Japan;4. The Center for Advanced Medical Engineering and Informatics, Osaka University, 2-2 Yamadaoka, Suita, 565-0817 Osaka;1. Department of Mechanical, Energy, and Materials Engineering, University of Extremadura, 06006 Badajoz, Spain;2. National Research Centre “Kurchatov Institute”, Moscow 123182, Russia;3. Department of Materials and Environmental Chemistry, University of Stockholm, 10691 Stockholm, Sweden;1. Malaysia – Japan International Institute of Technology (MJIIT), Universiti Teknologi Malaysia Kuala Lumpur, Jalan Semarak, 54100 Kuala Lumpur, Malaysia;2. Department of Science in Engineering, Faculty of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728 Kuala Lumpur, Malaysia;3. Department of Manufacturing and Materials Engineering, Faculty of Engineering, International Islamic University Malaysia, P.O. Box 10, 50728 Kuala Lumpur, Malaysia;4. Department of Mechanical Engineering, College of Engineering, Universiti Tenaga Nasional, Jalan Ikram-Uniten, 43000 Kajang, Selangor, Malaysia;5. Structural Materials Niche Area, School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia;1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha 410083, PR China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;3. School of Physics and Electronics, Institute of Super-microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, PR China |
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| 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.% Al2O3 + 30 wt.% ZrO2) and ZTA-60 (40 wt.% Al2O3 + 60 wt.% ZrO2). 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 Al2O3 was replaced by equivalent amounts of AlN 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 °C in comparison to those consolidated by HAS. |
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