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Carbon nanotube/boehmite-derived alumina ceramics obtained by hydrothermal synthesis and spark plasma sintering (SPS)
Authors:Ali Can Zaman  Cem B Üstündağ  Ali Çelik  Alpagut Kara  Figen Kaya  Cengiz Kaya
Affiliation:1. Department of Metallurgical and Materials Engineering, Yildiz Technical University, Davutpasa Campus, Esenler, Istanbul, Turkey;2. Vocational School, Department of Ceramics, Yildiz Technical University, Maslak Campus, Maslak, ?stanbul, Turkey;3. Department of Materials Science and Engineering, Anadolu University, Eski?ehi, Turkey;4. Department of Metallurgical Engineering, Zonguldak Karaelmas University, Zonguldak, Turkey;1. Department of Chemistry, National University of Singapore, Singapore 117542, Singapore;2. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117542, Singapore;3. Department of Physics, National University of Singapore, Singapore 117542, Singapore;1. Key Laboratory for Automobile Materials (JLU), Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130012, PR China;2. College of Physics, Jilin University, Changchun 130012, PR China;1. EnGlobe Corp., 4495 Boul. Wilfrid-Hamel, Québec, Qc G1P 2J7, Canada;2. McGill University, 845 Rue Sherbrooke O, Montreal, Qc H3A 0G4, Canada;3. CNETE, 2263 Collège Ave., Shawinigan, Qc G9N 6V8, Canada;1. Dalian National Library for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;2. Vontron Technology Co., Ltd., Guiyang 550018, Guizhou, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Biological and Chemical Engineering, Fuqing Branch of Fujian Normal University, Fuzhou 350300, Fujian, China;2. College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, Fujian, China;1. Dipartimento di Chimica Industriale “Toso Montanari”, Alma Mater Studiorum Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy;2. Consorzio INSTM, Research Unit of Bologna, Firenze, Italy;3. eni S.p.A, Centro Ricerche Energie non Convenzionali Istituto eni “G. Donegani”, Via Fauser, 4 Novara, Italy
Abstract:Preparation, structure and properties of hydrothermally treated carbon nanotube/boehmite (CNT/γ-AlOOH) and densification with spark plasma sintering of Al2O3 and CNT/Al2O3 nanocomposites were investigated. Hydrothermal synthesis was employed to produce CNT/boehmite from an aluminum acetate (Al(OH)(C2H3O2)2) and multiwall-CNTs mixture (200 °C/2 h.). TEM observations revealed that the size of the cubic shape boehmite particles lies around 40 nm and the presence of the interaction between surface functionalized CNTs and boehmite particles acts to form ‘nanocomposite particles’. Al2O3 and CNT/Al2O3 compact bodies were formed by means of spark plasma sintering (SPS) at 1600 °C for 5 min using an applied pressure of 50MPa resulting in the formation of stable α-Al2O3 phase and CNT–alumina compacts with nearly full density. It was also found that CNTs tend to locate along the alumina grain boundaries and therefore inhibit the grain coarsening and cause inter-granular fracture mode. The DC conductivity measurements reveal that the DC conductivity of CNT/Al2O3 is 10?4 S/m which indicate that there is a 4 orders of magnitude increase in conductivity compared to monolithic Al2O3. The results of the microhardness tests indicate a slight increase in hardness for CNT/Al2O3 (28.35 GPa for Al2O3 and 28.57 GPa for CNT/Al2O3).
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