Effect of two-step sintering on the hydrothermal ageing resistance of tetragonal zirconia polycrystals |
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| Affiliation: | 1. Department of Physics, University of Jaffna, Jaffna, JA 40000, Sri Lanka;2. Centre of Advanced Manufacturing & Material Processing (AMMP), Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;3. Division of Neurosurgery, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia;4. Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;5. Centre for Ionics University of Malaya, Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia;6. Escuela Universitaria Politécnica de La Almunia, Universidad de Zaragoza, Spain;1. Research Center for Rare Earths & Micro/Nano Functional Materials, Nanchang University, Nanchang 330031, China;2. Department of Prosthodontics, Stomatological Hospital Affiliated to Nanchang University, Nanchang 330006, China;3. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China;1. Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan;2. Department of Research and Development, Hocheng Co., Taoyuan, Taiwan;1. Instituto de Tecnología de Materiales (ITM), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain;2. Instituto de Aplicaciones de las Tecnologías de la Información y de las Comunicaciones Avanzadas (ITACA), Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, Spain;3. Instituto de Cerámica y Vidrio (ICV), Consejo Superior de Investigaciones Científicas (CSIC), E-28049 Madrid, Spain;1. Zhengzhou Institute of Aeronautical Industry Management, Henan 450046, PR China;2. School of Materials Science and Engineering, Zhengzhou University, Henan 450001, PR China;1. Lecturer, Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea;2. Associate Professor, Department of Dental Laboratory Science, College of Health Sciences, Catholic University of Pusan, Busan, Republic of Korea;1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg, 44, B-3001 Heverlee, Belgium;2. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;3. SCK CEN (Belgian Nuclear Research Centre), Boeretang 200, B-2400 Mol, Belgium;4. KU Leuven BIOMAT, Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals Leuven, Kapucijnenvoer, 7, Block A, B-3000 Leuven, Belgium |
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| Abstract: | The effects of two-step sintering (TSS) on the mechanical properties and hydrothermal ageing resistance of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) were investigated. In TSS, the first step involved heating the samples up to 1400 °C at a heating rate of 10 °C/min and holding the samples at this temperature for 1 min. The second step involved sintering by cooling the samples down to 1200 °C and holding the samples at this temperature for various holding times (t) ranging from 0 to 30 h before cooling to room temperature. Moreover, TSS promoted densification with increasing holding time without sacrificing the mechanical properties of the sintered body and causing abnormal grain growth. The average grain size was found not to be affected by the long holding times, and the final microstructure composed of a uniformly distributed tetragonal grain having sizes ranging from 0.24 to 0.26 µm. The beneficial effect of TSS in suppressing the hydrothermal ageing of Y-TZP has been revealed in the present work. In particular, samples sintered at t=20 and 30 h exhibited excellent resistance to low-temperature degradation when exposed to superheated steam at 180 °C, attributed mainly to the enhance densification of the sintered bodies. |
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| Keywords: | Two-step sintering Y-TZP Hydrothermal ageing Mechanical properties |
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