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Designing, fabrication and characterization of nanostructured functionally graded HAp/BCP ceramics

Authorized Users Only
2015
Authors
Marković, Smilja
Lukić, Miodrag J.
Škapin, Srečo Davor
Stojanović, Boban
Uskoković, Dragan
Article (Published version)
Metadata
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Abstract
Nanostructured calcium phosphate functionally graded materials (FGMs) with simultaneous gradients of density, phase composition, and mechanical properties were fabricated by consecutive uniaxial pressing of stoichiometric (SHAp) and calcium deficient (CDHAp) hydroxyapatite powders in multilayered samples and reaction sintering. During sintering procedure SHAp composition remained stable (HAp) while CDHAp was phase transformed in biphasic calcium phosphate (BCP, i.e. HAp+β-TCP) yielding HAp/BCP FGMs. To reduce mismatch stress between adjacent layers, generated during sintering, gradient of phase composition was optimized by introducing intermediate layer(s) made from a mixture of SHAp and CDHAp in an appropriate mass ratio. Optimal processing conditions for preparation of nanostructured ceramics were provided via two-step sintering. High-quality FGMs structure, without delamination, cracks and micro-structural damages was observed by an SEM technique; moreover, a detailed examination by... FE-SEM established the unidirectional (perpendicular with respect to the layers) gradual change of microstructure, from fully dense to ~40% of porosity. Detailed micro-Raman and FTIR spectroscopy studies showed an increase of β-TCP amount along the FGMs height, confirming gradient of phase composition. Mechanical properties measured by microindentation revealed gradual change of microhardness from 650 to 115 HV, with simultaneous change of Young's modulus from 92 to 24 GPa. © 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Keywords:
sintering / mechanical properties / calcium phosphates / functionally graded materials / nanostructure
Source:
Ceramics International, 2015, 41, 2, 2654-2667
Publisher:
  • Elsevier
Projects:
  • Molecular designing of nanoparticles with controlled morphological and physicochemical characteristics and functional materials based on them (RS-45004)
  • Bilateral cooperation program between the Republic of Serbia and the Republic of Slovenia, Project 451-03-1251/2012-09/06
Note:
  • Peer-reviewed manuscript: http://dais.sanu.ac.rs/123456789/588

DOI: 10.1016/j.ceramint.2014.10.079

ISSN: 0272-8842

WoS: 000348003100003

Scopus: 2-s2.0-84919458370
[ Google Scholar ]
23
18
URI
http://dais.sanu.ac.rs/123456789/3529
Collections
  • ITN SANU - Opšta kolekcija / ITS SASA - General collection
Institution
Институт техничких наука САНУ / Institute of Technical Sciences SASA

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