발간논문

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Vol.35, No.6, 777 ~ 784, 1997
Title
Densification of porous SLS Al2O3-Al4B2O9 Ceramic Composites through Infiltration
In Sup Lee
Abstract
Further densification of the Al₂O₃-Al₄B₂O_9 ceramic composites has been carried out by infiltration of alumina sol, colloidal silica, and chromic sad into these porous SLS (Selective Laser Sintering) parts followed by heat-treatment at high temperature (1600℃). The infiltration with colloidal silica into the composites yielded mullite(3Al₂O₃·2SiO₂) and excess amorphous silica phase which did not react with alumina. The maximum density of this composite was about 75% of the theoretical density and the maximum bend strength was around 33㎫. A solid solution of Al₂O₃,-Cr₂O₃ was obtained by infiltration with chromic acid into the composites. The density was about 80% of the theoretical density and the bend strength was around 15㎫. Finally, single phase alumina parts with 50% of the theoretical density were obtained by the infiltration of alumina sol into the composites. The bend strength after firing was found to be about 20㎫.
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