Sol-gel derived zinc doped calcium phosphate bioceramics prepared via different sintering strategies
Sinterability of zinc doped calcium phosphate (CaP) sintered via conventional pressureless and two step sintering methods was investigated. The starting powders have been synthesized through sol-gel method with zinc concentration varied in the range of 0, 1, 4, and 10mol%. After uniaxial pressing...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Trans Tech Publications, Switzerland
2015
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/46933/ http://irep.iium.edu.my/46933/ http://irep.iium.edu.my/46933/1/46933_-_Sol-gel_derived_zinc_doped_calcium_phosphate_bioceramics_prepared_via_different_sintering_strategies.pdf |
| Summary: | Sinterability of zinc doped calcium phosphate (CaP) sintered via conventional
pressureless and two step sintering methods was investigated. The starting powders have been
synthesized through sol-gel method with zinc concentration varied in the range of 0, 1, 4, and
10mol%. After uniaxial pressing, the compacts were sintered via conventional pressureless
sintering. The dense samples were studied in terms of the phase stability, relative density, Vickers
hardness, and fracture toughness. The phase of samples was hydroxyapatite and β-tricalcium
phosphate. The presence of Zn caused a change in the sintering behaviour of dense calcium
phosphate. Zn doping has improved relative density of 4mol% Zn-doped by 8.1% compared to
undoped fired at 1300oC. The maximum fracture toughness of 1.43 MPa.m1/2 and Vickers hardness
of 3.44 GPa were achieved at 1200oC by 4 mol% Zn-doped. The low Vickers hardness and fracture
toughness obtained for dense samples sintered of two step sintering compared to conventional
pressureless sintering is due to the low measured bulk density. This study showed that conventional
pressureless sintering was beneficial in producing high toughness of Zn doped CaP. |
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