Abstract
Porous Al₂O₃-(m-ZrO₂) 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 Al₂O₃-(m-ZrO₂) bodies was about 200 ㎛ 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℃) using 55 vol % PMMA, their values were about 50.8%, 29.8 ㎫, 266.4 Hv, and 6.4 ㎬, respectively. To make the Al₂O₃-(m-ZrO₂)/polymer hybrid composites, a bioactive polymer, such as PMMA, was infiltrated into the porous Al₂O₃-(m-ZrO₂) composites. After infiltration, most of the pores in the porous Al₂O₃-(m-ZrO₂) 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.
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