Sintering behavior of hydroxyapatite ceramics prepared by different routes
The sintering behaviour of three different HA, i.e. a commercial HA(C) and synthesized HA by wet precipitation, HA(W) and mechanochemical method, HA(M) were investigated over the temperature range of 1000 degrees C to 1350 degrees C. In the present research, a wet chemical precipitation reaction was...
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| Main Authors: | , , , |
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| Format: | Book |
| Published: |
Engineering
2010
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| Subjects: | |
| Online Access: | http://eprints.um.edu.my/6548/ |
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| Summary: | The sintering behaviour of three different HA, i.e. a commercial HA(C) and synthesized HA by wet precipitation, HA(W) and mechanochemical method, HA(M) were investigated over the temperature range of 1000 degrees C to 1350 degrees C. In the present research, a wet chemical precipitation reaction was successfully employed to synthesize highly crystalline, high purity and single phase stoichiometric HA powder that is highly sinteractive particularly at low temperatures below 1100 degrees C. It has been revealed that the sinterability and mechanical properties of the synthesized HA by this method was significantly higher than that of the commercial material and HA which was synthesized by mechanochemical method. The optimum sintering temperature for the synthesized HA(W) 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 MPam(1/2). In contrast, the optimum sintering temperature for the commercial HA(C) and synthesized HA(M) 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 MPam(1/2) and 0.82 MPam(1/2) being measured, respectively. |
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