Phase stability and rapid consolidation of hydroxyapatite-zirconia nano-coprecipitates made using continuous hydrothermal flow synthesis

Chaudhry, A.A. and Yan, H. and Viola, G. and Reece, M.J. and Knowles, J.C. and Gong, K. and Rehman, I. and Darr, J.A. (2012) Phase stability and rapid consolidation of hydroxyapatite-zirconia nano-coprecipitates made using continuous hydrothermal flow synthesis. JOURNAL OF BIOMATERIALS APPLICATIONS, 27 (1). pp. 79-90. ISSN 0885-3282

Full text not available from this repository.

Abstract

A rapid and continuous hydrothermal route for the synthesis of nano-sized hydroxyapatite rods co-precipitated with calcium-doped zirconia nanoparticles using a superheated water flow at 450°C and 24.1MPa as a crystallizing medium is described. Hydroxyapatite and calcium-doped zirconia phases in the powder mixtures could be clearly identified based on particle size and morphology under transmission electron microscopy. Retention of a nanostructure after sintering is crucial to load-bearing applications of hydroxyapatite-based ceramics. Therefore, rapid consolidation of the co-precipitates was investigated using a spark plasma sintering furnace under a range of processing conditions. Samples nominally containing 5 and 10wt% calcium-doped zirconia and hydroxyapatite made with Ca:P solution molar ratio 2.5 showed excellent thermal stability (investigated using in situ variable temperature X-ray diffraction) and were sintered via spark plasma sintering to >96% sintered densities at 1000°C resulting in hydroxyapatite and calcium-doped zirconia as the only two phases. Mechanical tests of spark plasma sintering sintered samples (containing 10wt% calcium-doped zirconia) revealed a three-pt flexural strength of 107.7MPa and Weibull modulus of 9.9. The complementary nature of the spark plasma sintering technique and continuous hydrothermal flow synthesis (which results in retention of a nanostructure even after sintering at elevated temperatures) was hence showcased. © The Author(s) 2012 Reprints and permissions.

Item Type:
Journal Article
Journal or Publication Title:
JOURNAL OF BIOMATERIALS APPLICATIONS
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500/2502
Subjects:
ID Code:
132895
Deposited By:
Deposited On:
16 Apr 2019 15:55
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 11:57