Abstract
Composites of calcium hydroxyapatite (HA) powders containing 0–50vol.% of ZrO2 nanopowder with 3mol% Y2O3 (3YSZ) were consolidated very rapidly under pressure by high-frequency induction heating sintering (HFIHS). The effects of the addition of 3YSZ on the relative density, hardness, fracture toughness, wear resistance and grain growth were studied. All of the sintered samples were analyzed by X-ray diffraction (XRD) to determine the phase content. The calcium HA with 20vol.% 3YSZ showed optimal combination of properties in terms of relative density, hardness and fracture toughness, which caused superior sliding wear performance under the test conditions examined. The degradation of the properties of HA with 40 and 50vol.% 3YSZ was attributed to a combination of some decomposition of HA into tricalcium phosphate (TCP) and some residual porosity. On the contrary, the HA composite with 10vol.% 3YSZ content appeared to be weakened little by YSZ as a strengthening agent. The results revealed the effectiveness of the HFIHS method for achieving near theoretical densities without significant grain growth for the geometry of the sample studied.
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