The Effects of Zirconia Additions on the Sintering Behaviour and Phase Stability of Hydroxyapatite Ceramics
Hydroxyapatite-zirconia composites with different ratios were prepared by using the conventional ball-milling technique. Ceramic pellets prepared from these powders were compacted and sintered without distorting or cracking. The sintering behaviour (at 1250'C, 1400'C and 1600'C) of...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English English |
| Published: |
Universiti Putra Malaysia Press
2001
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| Online Access: | http://psasir.upm.edu.my/id/eprint/3693/1/The_Effects_of_Zirconia_Additions_on_the_Sintering_Behaviour.pdf http://psasir.upm.edu.my/id/eprint/3693/ |
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| Summary: | Hydroxyapatite-zirconia composites with different ratios were prepared by using the
conventional ball-milling technique. Ceramic pellets prepared from these powders were
compacted and sintered without distorting or cracking. The sintering behaviour (at
1250'C, 1400'C and 1600'C) of the composites were studied in terms of phase stability,
densification and microstructural evolution. By X-ray diffraction, tetragonal zirconia as
well as HA was identified as the major phases in the composites. In addition, small
diffraction peaks corresponding to a-TCP was evident indicating sign ofHA decomposition.
Reaction between the zirconia and HA to form caZro. was also detected in the
composite system containing up to 20 wt% zirconia throughout the sintering regime
employed. 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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