Abstract
The effects of colloidal alumina infiltration on porous silica-based composites for complex designed ceramic cores were investigated. The specimens pre-sintered at 1100°C for 2h were immersed into colloidal alumina and were sintered at 1300°C for 2h. Infiltrated alumina particles were coagulated on the surface of fused silica via their opposite electrical charges in the infiltrating solution. The infiltrated alumina was reacted with the surface of fused silica, and mullite was formed thereafter. The shrinkage and microcracking induced by surface crystallization of fused silica to cristobalite was prevented by mullitization. As a result, the formation of mullite by alumina infiltration for 150min dramatically improved the flexural strength (3.3MPa to 9.6MPa) and reduced the linear shrinkage (2% to 1%) of the silica-based composites. However, longer infiltration time over 150min has no significant effects on flexural strength and linear shrinkage.
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