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

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

Research output: Contribution to journalArticlepeer-review

53 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)791-799
JournalActa Biomaterialia
Volume7
Issue number2
DOIs
Publication statusPublished - 2011

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