The sintering behavior of three different types of hydroxyapatite (HA) i.e. a commercial powder, HA(C), a synthesized powder by wet chemical precipitation method, HA(W) and a synthesized powder by mechanochemical method, HA(M) were investigated over the temperature range of 1000-1350 degrees C. It has been revealed that the sinterability and mechanical properties of the synthesized HA(W) was significantly higher than that of the HA(C) and HA(M). The optimum sintering temperature for the HA(W) samples was 1100 degrees C with the following properties being recorded: 99.8% relative density, Vickers hardness of 7.04 GPa and fracture toughness of 1.22 MPa m(1/2). In contrast, the optimum sintering temperature for the HA(C) and HA(M) samples was 1300 degrees C with relative density of 98% and 95.5%, Vickers hardness of 5.47 GPa and 4.73 GPa, fracture toughness of 0.75 MPa m(1/2) and 0.82 MPa m(1/2) being measured. The present research showed that the wet chemical precipitation reaction was beneficial in producing a highly crystalline, high purity and single phase stoichiometric HA powder that is sinteractive particularly at low temperatures below 1100 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
- engineering ceramics sintering mechanical nanocrystalline hydroxyapatite mechanochemical synthesis mechanical-properties biomaterials temperature powders
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