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, t...

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Veröffentlicht in:Advanced Materials Research 2015-07, Vol.1115, p.341-344
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description 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 1300°C. The maximum fracture toughness of 1.43 MPa.m1/2 and Vickers hardness of 3.44 GPa were achieved at 1200°C 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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subjects Calcium phosphate
Diamond pyramid hardness
Fracture toughness
Loose powder sintering
Pressureless sintering
Sintering (powder metallurgy)
Vickers hardness
Zinc
title Sol-Gel Derived Zinc Doped Calcium Phosphate Bioceramics Prepared via Different Sintering Strategies
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