Process induced alignment of carbon nanotube decreases longitudinal thermal conductivity of Al2O3 based porous composites |
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| Affiliation: | 1. Department of Materials Science and Engineering, Indian Institute of Technology-Kanpur, Kanpur, 208016, Uttar Pradesh, India;2. Department of Mechanical Engineering, Indian Institute of Technology-Kanpur, Kanpur, 208016, Uttar Pradesh, India;3. Materials and Mechanical Entity, Vikram Sarabhai Space Centre, Indian Space Research Organization, Trivandrum, 695022, Kerala, India;1. Mechanical and Industrial Engineering Department, Indian Institute of Technology Roorkee, UK 247667, India;2. School of Mechanical Science, Indian Institute of Technology Bhubaneswar, Odisha 751013, India;3. R&D, Metallizing Equipment Co. Pvt. Ltd., Jodhpur, India;1. School of Mechanical Engineering, University of Adelaide, South Australia 5005, Australia;2. Department of Mechanical Engineering, McGill University, Montreal, Quebec H3A 0C3, Canada;1. Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India;2. Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036, India;3. Bioceramics and Coating Division, CSIR-Central Glass and Ceramic Research Institute, Kolkata, West Bengal, 700032, India;4. Chemical Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, Uttar Pradesh, India;5. Materials Science Programme, Indian Institute of Technology Kanpur, Kanpur, 208016, Uttar Pradesh, India;6. Centre for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, Uttar Pradesh, India;7. Materials Innovation Guild, Department of Mechanical Engineering, University of Louisville, Louisville, KY 40208, USA;1. Department of Metallurgy and Materials Engineering, Faculty of Technology and Engineering, Shahrekord University, P.O. Box 115, Shahrekord, Iran;2. Department of Mining and Metallurgical Engineering, Yazd University, 89195-741, Yazd, Iran;1. Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea;2. Ceramic Fiber and Composite Materials Center, Korea Institute of Ceramic Engineering and Technology, 101 Soho-ro, Jinju-si, Gyeongsangnam-do 52851, South Korea;3. Department of Fiber System Engineering, Dankook University, 152 Jukjeon-ro, Suji-gu, Gyeonggi-do 16890, South Korea |
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| Abstract: | Alumina (Al2O3) based porous composites, reinforced with zirconia (ZrO2), 3 and 8 mol% Y2O3 stabilized ZrO2 (YSZ) and 4 wt% carbon nanotube (CNT) are processed via spark plasma sintering. The normalized linear shrinkage during sintering process of Al2O3-based composite shows minimum value (19.2–20.4%) for CNT reinforced composites at the temperature between 1650 °C and 575 °C. Further, the combined effect of porosity, phase-content and its crystallite size in sintered Al2O3-based porous composite have elicited lowest thermal conductivity of 1.2 Wm?1K?1 (Al2O3-8YSZ composite) at 900 °C. Despite high thermal conductivity of CNT (～3000 Wm?1K?1), only a marginal thermal conductivity increase (～1.4 times) to 7.3–13.4 Wm?1K?1 was observed for CNT reinforced composite along the longitudinal direction at 25 °C. The conventional models overestimated the thermal conductivity of CNT reinforced composites by up to ～6.7 times, which include the crystallite size, porosity, and interfacial thermal resistance of Al2O3, YSZ and, CNT. But, incorporation of a new process induced CNT-alignment factor, the estimated thermal conductivity (of <6.6 Wm?1K?1) closely matched with the experimental values. Moreover, the high thermal conductivity (<76.1 Wm?1K?1) of the CNT reinforced porous composites along transverse direction confirms the process induced alignment of CNT in the spark plasma sintered composites. |
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| Keywords: | Carbon nanotube (CNT) Spark plasma sintering (SPS) Alignment Thermal conductivity |
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