Toughening effect of multi-walled boron nitride nanotubes and their influence on the sintering behaviour of 3Y-TZP zirconia ceramics |
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| Affiliation: | 1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, Brno, Czech Republic;2. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Košice, Slovak Republic;3. Nanoforce Technology Limited, Queen Mary University of London, London E1 4NS, United Kingdom;4. Materials Research Institute, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom;1. Inst. Ciencia de Materiales de Sevilla (CSIC-University Sevilla), Avda. Américo Vespucio 49, 41092 Sevilla, Spain;2. Dep. Física de la Materia Condensada, University de Sevilla, Apdo. 1065, 41080 Sevilla, Spain;1. Instituto de Cerámica y Vidrio (ICV), Consejo Superior de Investigaciones Científicas (CSIC), Kelsen 5, E-28049 Madrid, Spain;2. Centro de Investigación en Nanomateriales y Nanotecnología (Consejo Superior de Investigaciones Científicas, Universidad de Oviedo, Principado de Asturias), Avenida de la Vega 4-6, 33940 El Entrego, Spain;3. Nanoinnova Technologies SL, Parque Científico de Madrid, Faraday, 7, E-28049 Madrid, Spain;4. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain;1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;2. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology(WUST), Wuhan 430081, China;1. School of Electromechanical Engineering, Guangdong University of Technology, 510006 Guangzhou, China;2. Instituto de Cerámica de Galicia, Universidad de Santiago de Compostela, 15706 A Coruña, Spain;1. Nanotube Unit, World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 3050044, Japan;2. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tennodai 1, Tsukuba, Ibaraki 3050005, Japan;3. Research Center for Strategic Materials, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 3050044, Japan;4. Laboratory of Inorganic Nanomaterials, National University of Science and Technology “MISIS”, Leninsky pr. 4, Moscow 119049, Russian Federation |
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| Abstract: | Different amounts (0.5, 1, 2.5 and 5 wt%) of hollow “cylindrical” and “bamboo-like” boron nitride nanotubes (BNNTs) have been used to reinforce 3Y-TZP zirconia ceramics via spark plasma sintering. No significant influence of different morphologies of BNNTs on the mechanical properties at the macro-scale (elastic modulus, hardness, and fracture toughness) has been observed. The fracture toughness increased continuously with the increasing amount of the BN nanotubes up to 2.5%, resulted in the improvement of ∼100% compared to the reference ZrO2. A direct influence of BNNTs on the toughening of ZrO2 has been recognized. The BNNTs strengthen the zirconia grain boundaries resulting in the alteration in fracture mode from inter- to trans-granular. The BNNTs also promoted the transformation toughening of zirconia. Their influence on the bridging and pull out has been confirmed by the investigation of the composites with the amorphous borosilicate matrix. |
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| Keywords: | Zirconia Boron nitride nanotubes Composite Spark plasma sintering Toughening mechanism |
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