The master sintering curves for BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 functionally graded materials |
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| Authors: | Smilja Marković Dragan Uskoković |
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| Affiliation: | 1. Department of Industrial Engineering, University of Trento, 38123 Trento, Italy;2. Department of Mechanical Engineering, University of Colorado at Boulder, Boulder, CO 80309-0427, USA;1. Department of Physics, Arab-American University, Jenin, West Bank, Palestine;2. Group of Physics, Faculty of Engineering, Atilim University, 06836 Ankara, Turkey;3. Metallurgical and Materials Engineering Department, Marmara University, 34722 Istanbul, Turkey;1. School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi’an, 710021, China;2. Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China;1. nstitute of Industrial Sciences, The University of Tokyo, Komaba 4-6-1, Meguro-ku, Tokyo 153-8505, Japan;2. Department of Mechanical Engineering, Faculty of Engineering, Chiba Institute of Technology, Tsudanuma 2-17-1, Narashino, Chiba 275-0016, Japan;1. Technical University of Denmark, Department of Energy Conversion and Storage, Risø Campus, Frederiksborgvej 399, P.O. Box 49, Building 779, 4000 Roskilde, Denmark;2. San Diego State University, Mechanical Engineering Department, 5500 Campanile Dr., San Diego, CA 92182-1323, USA |
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| Abstract: | The most important aim in the design and processing of functionally graded materials (FGMs) is to produce devices free from any deformation. Smart choices of different combination of graded layers, as well as the heating rate during sintering, are important for the fabrication of high-quality FGMs. In this study, BaTi0.975Sn0.025O3/BaTi0.85Sn0.15O3 (noted as BTS2.5 and BTS15, respectively) FGM was used as a model system for the construction of master sintering curves (MSCs) and estimation of the effective activation energies of sintering for different BTS graded layers. The MSCs were constructed, for BTS2.5 and BTS15 graded layers in FGMs, using shrinkage data obtained by a heating microscope during sintering at four constant heating rates, 2, 5, 10 and 20 °/min. The effective activation energies were determined using the concept of MSC; values of 359.5 and 340.5 kJ/mol were obtained for graded layers BTS2.5 and BTS15, respectively. A small difference of the effective activation energies of chosen powders made it possible for us to prepare high-quality FGMs, without delamination, distortion or other forms of defects. |
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