| PVA를 이용한 Solution-Polymerization 합성법에 의하여 제조된 Mullite-Cordierite 복합체의 소결특성 |
| 이용석, 이병하 |
| 명지대학교 세라믹공학과 |
| Characteristic of Sintering of Mullite-Cordierite Composite by a Solution-Polymerization Route Employing PVA |
| Yong-Seok Lee, Byung-Ha Lee |
| Department of Ceramic Engineering, Myoungji University |
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| ABSTRACT |
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The characteristics of sintering for Mullite-Cordierite (MC) composites and the effect of $TiO_2$ addition were studied. The MC composites were manufactured by a solution-polymerization method using PVA as a polymer carrier, and $TiO_2$ was used as a sintering agent. They were calcined at $1300^{circ}C$, planetary milled for 4 h and sintered at $1450^{circ}C$. As cordierite content increased, relative density of materials was increased up to $98%$ and sinterability was improved. In case of $50;wt%$ mullite/$5;wt%$ cordierite composition sintered for 16 h, the flexural strength and thermal expansion coefficient were 190 MPa and $3.07{times}0^{-6}/^{circ}C$, respectively. However, mechanical properties were decreased with the cordierite contents higher than $50;wt%$ because of the excess liquid-phase amount. As the addition of $TiO_2$ is increased, columnar crystal of mullite and liquid-phase contents were increased. In particular, the flexural strength and thermal expansion coefficient decreased in case of $5;wt%;TiO_2$ addition. |
| Key words:
Mullite, Cordierite, Mullite-cordierite composite, PVA, Solution-polymerization route |
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