| Mullite-bonded porous SiC-based Mn3O4–Ni system: control of electrical resistivity, flexural strength, and extrusion |
Muhammad Shoaib Anwar1,2, Syed Zaighum Abbas Bukhari1, Jang-Hoon Ha1, Jongman Lee1,2, In-Hyuck Song1,2
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1Ceramic Materials Division , Korea Institute of Materials Science (KIMS), 797 Changwon-daero, Seongsan-gu, Changwon-si, Gyeongsangnam-do 51508, Republic of Korea
2Department of Advanced Materials Engineering, University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea |
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Received: January 29, 2022; Revised: June 22, 2022 Accepted: July 25, 2022. Published online: August 18, 2022. |
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| ABSTRACT |
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An electrically conductive mullite-bonded porous SiC-based Mn3O4–Ni system was designed, which provided low-temperature sintering and excellent extrudability into complex shapes. Each designed composition contained kaolin (30 wt%) and Mn3O4 (10 wt%) as sintering aids. The combination of Ni (0–20 wt%) and sintering temperature (1100–1300 °C) regulated the electrical resistivity (5.5 × 107 –3.4 × 10–1 Ω cm) and flexural strength (33 ± 2–59 ± 3 MPa) of the sintered samples. Interface reactions formed secondary phases [e.g. nickel silicide (Ni2Si) and manganese silicate (MnSiO3)], which decreased the electrical resistivity. The in situ formation of mullite and an increased amount of Ni collectively improved the flexural strength. The sample with 15 wt% Ni sintered at 1200 °C in argon fl ow had a low electrical resistivity of 5.6 × 10–1 Ω cm and a good flexural strength of 51 ± 4 MPa. The same composition was extruded to form a square honeycomb structure to verify the large-scale viability of the developed composition. |
| Key words:
Porous SiC · Extrusion · Electrical resistivity · Low-temperature sintering · Flexural strength |
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