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Fibrous Al203-(monoclinic-Zr02)/HAp-(tetragonal-Zr02) composites were fabricated with a core/shell microstructure by the multi-pass extrusion process depending on the volume fraction of Al 2 O 3 -(m-ZrO 2 ) core and HAp-(t-ZrO 2 ) shell. In the sample sintered at 1200°C, the Al 2 O 3 -(m-ZrO 2 ) 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 CaAl 12 O 19 . Formation of elongated grain increased as the core diameter decreased. A significantly improved value of fracture toughness (4.3 MPa·m 1/2 ) was obtained in the Al 2 O 3 -(m-Zr02)/HAp-(t-Zr02) composites with 50 core /50 shell composition sintered at 1500°C.

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