LZS/Al2O3 nanostructured composites obtained by colloidal processing and spark plasma sintering |
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| Affiliation: | 1. Laboratory of Glass-Ceramic Materials (VITROCER), Federal University of Santa Catarina, Florianópolis, SC, Brazil;2. Centro de Investigación en Nanomateriales y Nanotecnología, CSIC, Universidad de Oviedo, Principado de Asturias, Spain;3. Instituto de Tecnología de Materiales, Universitat Politècnica de València, Spain;4. Institute of Ceramics & Glass, CSIC, Madrid, Spain;1. Directeur de Recherche CNRS, Science des Procédés Céramiques et de Traitements de Surface - SPCTS, UMR 7315 CNRS-Centre Européen de la Céramique,12 Rue Atlantis 87068 LIMOGES Cedex, France;2. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université Montpellier, Place E. Bataillon, 34095 Montpellier, France;3. IEM (Institut Europeen des Membranes), UMR 5635 (CNRS-ENSCM-UM), Université Montpellier, Place E. Bataillon, 34095 Montpellier, France;1. Instituto Federal da Bahia, 48607-000 Paulo Afonso, Bahia, Brazil;2. Departamento de Física, Universidade Federal de Sergipe, 49100-000 São Cristóvão, Sergipe, Brazil;1. School of Mechanical and Vehicle Engineering, West Anhui University, Lu''an 237012, Anhui, China;2. Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, Anhui, China;1. Departamento de Ingeniería Mecánica, Facultad de Ingeniería, Universidad de Tarapacá, Avda. General Velásquez, 1775, Arica, Chile;2. Department of Civil Engineering, KPR Institute of Engineering and Technology, Coimbatore, 641027, India;3. Department of Chemistry, Soongsil University, Seoul, 06978, South Korea;4. Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh, 11433, Saudi Arabia;5. Universidad Autónoma de Chile, Chile;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | Li2O-SiO2-ZrO2 (LZS) glass-ceramics have high mechanical strength, hardness, resistance to abrasion and chemical attack, but also a high coefficient of thermal expansion (CTE), which can be reduced adding alumina nanoparticles. The conventional glass-ceramic production is relatively complex and energy consuming, since it requires the melting of the raw materials to form a glass frit and a two-step milling process to obtain particle sizes adequate for compaction. This study describes the preparation of LZS glass-ceramics through a colloidal processing approach from mixtures of SiO2 and ZrO2 nanopowders and a Li precursor (lithium acetate obtained by reaction of the carbonate with acetic acid). Concentrated suspensions were freeze-dried to obtain homogeneous mixtures of powders that were pressed (100 MPa) and sintered conventionally and by spark plasma sintering. The effect of the alumina nanoparticles additions on suspensions rheology, sintering behavior and properties such as thermal expansion, thermal conductivity, hardness and Young’s modulus were evaluated. |
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| Keywords: | LZS glass-ceramics Nanoparticles Suspensions Sintering Spark plasma sintering |
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