Porous Alumina Via Protein Foaming-Consolidation Method
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Date
2015-12-01
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Abstract
We have succeeded in developing a novel method for preparation of porous alumina using egg yolk both as consolidator and foaming agents. Slurries of alumina powders and yolk were prepared by stirring the mixture with various alumina-to-yolk ratios (1.00, 0.83, 0.75, and 0.65) for 3 h and the resulting slips were poured into cylindrical shaped stainless steel molds and followed by foaming and consolidation through drying at 110, 150, 160, and 180 oC. The dried green bodies of the samples were then burned to remove the pore creating agent at 600 ºC for 1 h, followed by sintering at 1550 oC for 2 h. Alumina porous bodies with volume shrinkage of 29.3-39.9% were obtained. The compressive strength of the 1.00 alumina-to-yolk ratio’s sample was 4.57 MPa at 50.4 % porosity and it decreased significantly to 1.07 MPa at 71.7% porosity with alumina-to-yolk ratio of 0.65. Pore size distribution measurement showed that macropores of the sintered alumina porous bodies increased with the increased alumina-to-yolk ratio and temperature of drying process and were found in the range 50 – 900 μm. These results have opened a novel preparative way for porous ceramics especially alumina-based porous materials designed for biomedical applications.
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Protein foaming-consolidation, ceramics, porous, characterization