Properties of alumina 10 vol% zirconia composites—The role of zirconia starting powders |
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| Affiliation: | 1. Universität Stuttgart, Institute of Ceramics and Composites IFKB, Allmandring 7B, D-70569 Stuttgart, Germany;2. Universität Stuttgart, Institute for Materials Science IMW, Heisenbergstraße 3, D-70569 Stuttgart, Germany;1. State Key Laboratory of Automotive Simulation and Control, Jilin University, PR China;2. Key Laboratory of Automobile Materials (Ministry of Education), School of Materials Science and Engineering, Jilin University, No. 5988 Renmin Street, Changchun, 130022, PR China;1. Bayreuth Engine Research Center (BERC), Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany;2. Institute of Energy Research and Physical Technologies, Clausthal University of Technology, 38640 Goslar, Germany;1. CEA Tech Nouvelle Aquitaine, C?ur Bersol Bâtiment B, 28 Avenue Gustave Eiffel, 33600 Pessac, France;2. Center for Technology Transfers in Ceramics, Parc Ester Technopole, 7 rue Soyouz, 87068 Limoges, France;3. Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33400 Talence, France;1. Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;2. Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China;3. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin, 541004, China |
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| Abstract: | Zirconia toughened alumina (ZTA) materials are applied for cutting tools, wear parts and in biomedical applications. Due to the constraint of the rigid alumina matrix, ZTA materials with up to 10 vol% zirconia addition (AZ10) do not require addition of stabilizer oxides. AZ10 materials based on submicron sized alumina and four different submicron to nanoscale zirconia powders were manufactured by hot pressing at temperatures between 1475?1600 °C. Results show that the powder choice has a strong influence on mechanical properties, evolution of microstructure and phase composition. Best results with strength up to 850 MPa, fracture toughness values of 8.5 MPa√m and invulnerability to overfiring were obtained with zirconia powders showing the coarsest yet most homogeneous primary particle size and a low degree of agglomeration. Ultrafine but hard agglomerated powders lead to materials with extremely inhomogeneous microstructure and inferior properties. |
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| Keywords: | Alumina Zirconia Microstructure Mechanical properties |
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