| 실리콘과 카본을 이용한 다공질 탄화규소의 제조와 기계적 특성 |
| 김종찬, 이은주, 김득중 |
| 성균관대학교 신소재공학과 |
| Fabrication and Mechanical Properties of Porous Silicon Carbide Ceramics from Silicon and Carbon Mixture |
| Jong-Chan Kim, Eun Ju Lee, Deug-Joong Kim |
| School of Advanced Materials Science & Engineering, Sungkyunkwan University |
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| ABSTRACT |
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Silicon, carbon, and B4C powders were used as raw materials for the fabrication of porous SiC. ${beta}$-SiC was synthesized at $1500^{circ}C$ in an Ar atmosphere from a silicon and carbon mixture. The synthesized powders were pressed into disk shapes and then heated at $2100^{circ}C$. ${beta}$-SiC particles transformed to ${alpha}$-SiC at over $1900^{circ}C$, and rapid grain growth of ${alpha}$-SiC subsequently occurred and a porous structure with elongated plate-type grains was formed. The mechanism of this rapid grain growth is thought to be an evaporation-condensation reaction. The mechanical properties of the fabricated porous SiC were investigated and discussed. |
| Key words:
Silicon carbide, Porous ceramic, Phase transformation, Grain growth |
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