Publication:
Phase stability and microstructural development of Y-TZP-doped hydroxyapatite

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Date
2001
Authors
Ramesh S.
Muralithran G.
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Institute of Biomedical Engineering
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Abstract
Hydroxyapatite containing yttria-tetragonal zirconia polycrystals (Y-TZP) with different concentrations were prepared by using the conventional ball-milling technique. Samples prepared from these powders were compacted and sintered at three different temperatures (1250�C, 1400�C and 1600�C). The sintering behaviour of the composites were studied in terms of phase stability, densification and microstructural evolution. By X-ray diffraction, tetragonal zirconia as wall as HA was identified as the major phases in the composites. In addition, small diffraction peaks corresponding to ?-TCP was evident indicating sign of HA decomposition. Reaction between the zirconia and HA to form CaZrO2 was also detected in the composite system containing up to 20 wt% Y-TZP.SEM examination of the sintered composites at room temperature suggested the involvement of a reactive liquid phase during sintering. The presence of zirconia phase in hydroxyapatite matrix played an important role in the stability of the HA phase.
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Ball milling , Composite materials , Densification , Polycrystals , Scanning electron microscopy , Sintering , Stability , X ray diffraction , Zirconia , hydroxyapatite , yttrium , zirconium oxide , Microstructural development , article , biomedical engineering , chemical analysis , density , scanning electron microscopy , temperature , temperature sensitivity , X ray diffraction , Biomedical engineering
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