Abstract
CaF2 up to 2.5wt% was added to a mixture of 50vol% hydroxyapatite (HAp) and 50vol% zirconia containing 2mol% Y2O3. The mixture was hot-pressed at 1300°-1400°C and 20MPa for 10min. The sintered bodies obtained consisited of apatite (HAp and/or FAp) and zirconia (tetragonal and cubic phase). The addition of CaF2 enhanced the densification, incresing the bending strength and hardness. The bending strength of sintered body containing 0.5wt% CaF2 obtained at 1400°C was about 450MPa, whose value was about 12% larger than that without CaF2. On the other hand, the fracture toughness was not improved by the addition of CaF2. After soaking in distilled water, saline and Ringer's solution, bending strength of the composite ceramics was 12-14% lower than that in air.
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