Fabrication of fibrous Al2O3-(m-ZrO2)/HAp-(t-ZrO2) core/shell composites with elongated grain formation

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  • LEE Byong-Taek
    Department of Biomedical Engineering and Materials, School of Medicine, Soonchunhyang University
  • LEE Chi-Woo
    Institute of Multidisciplinary Research for Advanced Materials Division of Materials Control, Tohoku University
  • SARKAR Swapan Kumar
    Department of Biomedical Engineering and Materials, School of Medicine, Soonchunhyang University
  • SONG Ho-Yeon
    Department of Microbiology, School of Medicine, Soonchunhyang University

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Fibrous Al2O3-(monoclinic-ZrO2)/HAp-(tetragonal-ZrO2) composites were fabricated with a core/shell microstructure by the multi-pass extrusion process depending on the volume fraction of Al2O3-(m-ZrO2) core and HAp-(t-ZrO2) shell. In the sample sintered at 1200°C, the Al2O3-(m-ZrO2) core was composed of porous, equiaxed grains, independent of core/shell volume fraction. However, after sintering at 1500°C, the core phase was changed with elongated grains of a reaction phase CaAl12O19. Formation of elongated grain increased as the core diameter decreased. A significantly improved value of fracture toughness (4.3 MPa·m1/2) was obtained in the Al2O3-(m-ZrO2)/HAp-(t-ZrO2) composites with 50core/50shell composition sintered at 1500°C.

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