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

Chaudhry, Aqif, Yan, Haixue, Gong, Keenan, Inam, Fawad, Viola, Giuseppe, Reece, Michael, Goodall, Josephine, ur Rehman, Ihtesham, McNeil-Watson, Fraser, Corbett, Jason, Knowles, Jonathan and Darr, Jawwad (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.

Item Type:	Article
Uncontrolled Keywords:	SPS, CHFS, nanobioceramics, hydroxyapatite, nanorods
Subjects:	F200 Materials Science H300 Mechanical Engineering J300 Ceramics and Glasses J700 Industrial Biotechnology
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Fawad Inam
Date Deposited:	22 May 2013 16:17
Last Modified:	13 Oct 2019 00:31
URI:	http://nrl.northumbria.ac.uk/id/eprint/12658

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