Functionally Gradient and Micro‐Channeled Al2O3–(t‐ZrO2)/HAp Composites

Functionally gradient and micro‐channeled Al 2 O 3 –( t ‐ZrO 2 )/HAp composites were fabricated using the multi‐pass extrusion process depending on the sintering temperature. The continuous pores were homogeneously formed in the second‐passed samples and their size was about 180 μm in diameter. The functionally gradient Al 2 O 3 –( t ‐ZrO 2 )/HAp composites consisted of three layers, i.e., HAp/HAp–Al 2 O 3 –ZrO 2 /Al 2 O 3 –ZrO 2 . The relative density and bending strength increased as the sintering temperature increased and in the sample sintered at 1400°C, their maximum values were about 62.2% and 107.8 MPa, respectively.