High-strength nanograined and translucent hydroxyapatite monoliths via continuous hydrothermal synthesis and optimized spark plasma sintering

Chaudhry, A.A. and Yan, H. and Gong, K. and Inam, F. and Viola, G. and Reece, M.J. and Goodall, J.B.M. and Ur Rehman, I. and McNeil-Watson, F.K. and Corbett, J.C.W. and Knowles, J.C. and Darr, J.A. (2011) High-strength nanograined and translucent hydroxyapatite monoliths via continuous hydrothermal synthesis and optimized spark plasma sintering. Acta Biomaterialia, 7 (2). pp. 791-799. ISSN 1742-7061

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Abstract

The synthesis of high-strength, completely dense nanograined hydroxyapatite (bioceramic) monoliths is a challenge as high temperatures or long sintering times are often required. In this study, nanorods of hydroxyapatite (HA) and calcium-deficient HA (made using a novel continuous hydrothermal flow synthesis method) were consolidated using spark plasma sintering (SPS) up to full theoretical density in ∼5 min at temperatures up to 1000 °C. After significant optimization of the SPS heating and loading cycles, fully dense HA discs were obtained which were translucent, suggesting very high densities. Significantly high three-point flexural strength values for such materials (up to 158 MPa) were measured. Freeze-fracturing of disks followed by scanning electron microscopy investigation revealed selected samples possessed sub-200 nm sized grains and no visible pores, suggesting they were fully dense. © 2010 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type:
Journal Article
Journal or Publication Title:
Acta Biomaterialia
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1300/1305
Subjects:
ID Code:
132900
Deposited By:
Deposited On:
16 Apr 2019 15:50
Refereed?:
Yes
Published?:
Published
Last Modified:
07 Jan 2020 06:48