| 유리침투 알루미나 복합체의 물성에 미치는 유리조성의 영향 (II) : La2O3의 영향 |
| 이재희, 김철영 |
| 인하대학교 세라믹공학과 |
| Effect of Glass Composition on the Properties of Glass-Infiltrated Alumina (II) : Effect of La2O3 |
| Jae-Hee Lee, Cheol-Young Kim |
| Department of Ceramic Engineering, Inha University |
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| ABSTRACT |
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Glasses of $SiO_2-B_{2}O_3-Al_{2}O_3-CaO-La_{2}O_3$ with various amounts of $La_{2}O_3$ were infiltrated into a porous alumina to make an alumina-glass composite. The infiltration characterization and bending strength of the composite were examined in terms of glass composition. $La_{2}O_3$ in the glass decreased the high temperature viscosity and this enhanced the wetting behaviour of this glass to alumina, and made glass infiltration easier. The infiltrated glass dissolved the alumina skeleton, and $Al_{2}O_3$ component in the glass melt reprecipitated on the alumina. The grain growth occurred to a specific crystal direction. The glass containing $20mole%$ of $La_{2}O_3$ was crystallized after infiltration, and this enhanced the bending strength of the composite. |
| Key words:
High temperature viscosity, Glass-alumina composite, Dissolution-reprecipitation grain growth, Infiltration |
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