Microstructure and mechanical properties of spark plasma sintered zirconia-hydroxyapatite nano-composite powders

Kumar, R., Prakash, K. H., Cheang, P. and Khor, K. A. (2005) Microstructure and mechanical properties of spark plasma sintered zirconia-hydroxyapatite nano-composite powders. Acta Materialia, 53 8: 2327-2335. doi:10.1016/j.actamat.2005.01.039

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Author Kumar, R.
Prakash, K. H.
Cheang, P.
Khor, K. A.
Title Microstructure and mechanical properties of spark plasma sintered zirconia-hydroxyapatite nano-composite powders
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2005-05
Sub-type Article (original research)
DOI 10.1016/j.actamat.2005.01.039
Volume 53
Issue 8
Start page 2327
End page 2335
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 091207 Metals and Alloy Materials
090301 Biomaterials
Abstract ZrO2-hydroxyapatite composites spark plasma sintered (SPS) at 1075 ± 25°C involve inter and intra particle porosities. The porosity level in the compacts (<3–42%) varied with sintering pressure (4.5–17.3 MPa), and apparently contributed to the increase in indentation fracture toughness. Rietveld phase analysis revealed that the powders and SPS compacts composed of HA, tricalcium phosphate (TCP), zirconia (t- and c-ZrO2) and CaZrO3. The indentation toughness increased in tandem with porosity to about 20 vol% after which little or no cracking was observed in the compacts (even at loads up to 1 kgF). Possible reasons for this exceptional toughness are discussed. A 2-D model is proposed to describe the increase in toughness, which agrees with the experimental results. Thus, SPS compacts of nanoZrO2-HA composite powders could be considered for load-bearing orthopaedic implants because of its unique fracture toughness and high porosity.
Keyword Bio-composite powders
Radio frequency plasma spraying
Spark plasma sintering
Indentation fracture toughness
Porous compacts
Q-Index Code C1
Additional Notes Available online 2 March 2005.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Australian Institute for Bioengineering and Nanotechnology Publications
 
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Created: Wed, 04 Feb 2009, 13:20:50 EST by Maria Campbell on behalf of Aust Institute for Bioengineering & Nanotechnology