| Fabrication of Porous Al2O3-(m-ZrO2) Composites and Al2O3-(m-ZrO2)/PMMA Hybrid Composites by Infiltration Process |
| Byong-Taek Lee, Do Van Quang, Ho-Yeon Song1 |
Department of Biomedical Engineering and Materials, School of Medicine, Soonchunhyang University
1Department of Microbiology, School of Medicine, Soonchunhyang University |
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| ABSTRACT |
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Porous $Al_2O_3-(m-ZrO_2)$ composites were fabricated by pressureless sintering, using different volume percentages (40% - 60%) of poly methyl methacrylate (PMMA) powders as a pore-forming agent. The pore-forming agent was successfully removed, and the pore size and shape were well-controlled during the burn-out and sintering processes. The average pore size in the porous $Al_2O_3-(m-ZrO_2)$ bodies was about $200;{mu}m$ in diameter. The values of relative density, bending strength, hardness, and elastic modulus decreased as the PMMA content increased; i.e., in the porous body (sintered at $1500^{circ}C$) using 55 vol % PMMA, their values were about 50.8%, 29.8 MPa, 266.4 Hv, and 6.4 GPa, respectively. To make the $Al_2O_3-(m-ZrO_2)$/polymer hybrid composites, a bioactive polymer, such as PMMA, was infiltrated into the porous $Al_2O_3-(m-ZrO_2)$ composites. After infiltration, most of the pores in the porous $Al_2O_3-(m-ZrO_2)$ composites, which were made using 60 vol % PMMA additions, were infiltrated with PMMA, and their values of relative density, bending strength, hardness, and elastic modulus remarkably increased. |
| Key words:
Porous $Al_2O_3-(m-ZrO_2)$ composites, Infiltration, Ceramic-polymer composites |
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