Effect of reinforcement NbC phase on the mechanical properties of Al2O3-NbC nanocomposites obtained by spark plasma sintering |
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| Affiliation: | 1. Universidade de São Paulo, Faculdade de Zootecnia e Engenharia de Alimentos, Av. Duque de Caxias Norte, 225, 13635-900 Pirassununga, SP, Brazil;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. Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain;1. School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, China;2. Key Laboratory on Deep Geo-drilling Technology of the Ministry of Land and Resources, China University of Geosciences (Beijing), Beijing 100083, China;1. Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria;2. Montanuniversität Leoben, Institut für Struktur- und Funktionskeramik (ISFK), Peter-Tunner Straße 5, 8700 Leoben, Austria;3. Ceratizit Austria GmbH, Metallwerk-Plansee-Straße 71, 6600 Reutte, Austria;1. Department of Mechanical Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;2. Institute of Advanced Manufacturing Technology, 30-011 Krakow, ul. Wroclawska 37A, Poland;3. ITMO University, Kronverksky 49, St. Petersburg 197101, Russian Federation;4. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 West Green Street, Urbana, IL 61801, USA;1. Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy;2. Fabbrica Italiana Leghe Metalliche Sinterizzate (F.I.L.M.S.) SpA, Via Megolo 49, 28877 Anzola D''Ossola (VB), Italy |
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| Abstract: | The sintering behavior of Al2O3-NbC nanocomposites fabricated via conventional and spark plasma sintering (SPS) was investigated. The nanometric powders of NbC were prepared by reactive high-energy milling, deagglomerated, leached with acid, added to the Al2O3 matrix in the proportion of 5 vol% and dried under airflow. Then, the nanocomposite powders were densified at different temperatures, 1450–1600 °C. Effect of sintering temperature on the microstructure and mechanical properties such as hardness, toughness and bending strength were analyzed. The Al2O3-NbC nanocomposites obtained by SPS show full density and maximum hardness value > 25 GPa and bending strength of 532 MPa at 1500 °C. Microstructure observations indicate that NbC nanoparticles are dispersed homogeneously within Al2O3 matrix and limit their grain growth. Scanning electron microscopy examination of the fracture surfaces of dense samples obtained at 1600 °C by SPS revealed partial melting of the particle surfaces due to the discharge effect. |
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