Direct bonding of silicon carbide ceramics sintered with yttria |
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| Affiliation: | 1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science, Changwon, Gyeongnam 51508, Republic of Korea;1. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;3. National Institute for Materials Science, Ibaraki 305-0044, Japan;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. National Institute for Materials Science, Ibaraki 305-0044, Japan;3. Department of Materials Modelling and Characterization, Korea Institute of Materials Science, Changwon 51508, Republic of Korea;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 130-743, Republic of Korea;2. Department of Physics, Konkuk University, Seoul 143-701, Republic of Korea;1. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;2. Powder and Ceramics Division, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 51508, Republic of Korea;1. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea;2. Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of Seoul, Seoul 02504, Republic of Korea;3. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea;4. Electronic Materials Convergence Division, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea;5. SKC Solmics, Pyeongtaek 17784, Republic of Korea |
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| Abstract: | SiC ceramics sintered with yttria were successfully joined without an interlayer by conventional hot pressing at lower temperatures (2000–2050 °C) compared to those of the sintering temperatures (2050–2200 °C). The joined SiC ceramics sintered with 2000 ppm Y2O3 showed almost the same thermal conductivity (?198 Wm?1 K?1), fracture toughness (3.7 ± 0.2 MPa m1/2), and hardness (23.4 ± 0.8 GPa) as those of the base material, as well as excellent flexural strength (449 MPa). In contrast, the joined SiC ceramics sintered with 4 wt% Y2O3 showed very high thermal conductivity (?204 Wm?1 K?1) and excellent flexural strength (?505 MPa). Approximately 16–22% decreases in strength compared to those of the base SC materials were observed in both joined ceramics, due to the segregation of liquid phase at the interface. This issue might be overcome by preparing well-polished and highly flat surfaces before joining. |
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| Keywords: | Silicon carbide Joining Flexural strength Direct bonding |
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