| Electrically conductive Si3N4 bonded SiC: effect of Fe2O3, MoO3, and SiC particle size |
Muhammad Shoaib Anwar1,2, Hong Joo Lee1, Jang-Hoon Ha1, Jongman Lee1,2, In-Hyuck Song1,2
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1Nanomaterials Research 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: May 9, 2024; Revised: September 10, 2024 Accepted: October 19, 2024. Published online: November 27, 2024. |
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| ABSTRACT |
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The effects of initial SiC particle size on the electrical resistivity, thermal conductivity, and flexural strength of SiC when combined with Fe2O3 and MoO3 additives were investigated. Each batch contained 10 wt% Fe2O3 as a sintering additive. The addition of MoO3 (0–2 wt%) and variation in sintering temperature (1200–1400 °C) collectively influenced the electrical resistivity, while the thermal conductivity, air flow permeability and flexural strength was predominantly affected by the SiC particle size. The samples sintered at 1300 °C with 1 wt% of MoO3 showed an electrical resistivity, a thermal conductivity, and a flexural strength of 2.1 × 10–1 Ω cm, 21 W/m K, 59 MPa, respectively, for 4.5 μm SiC, and 3.1 × 10–1 Ω cm, 30 W/m K, 25 MPa, respectively, for 30 μm SiC. The in-situ formation of a network-like structure of secondary conductive phases such as Fe3Si along with the diffusion of N2 reduced the electrical resistivity, whereas the formation of Si3N4 improved the mechanical properties. The designed composition showed excellent extrudability, forming a square honeycomb structure, verifying its large-scale viability for novel applications, such as heatable filters and electrically conductive catalytic supports. |
| Key words:
Porous SiC · Electrical resistivity · Thermal conductivity · Heatable filters · Catalytic support |
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