Research Papers

Microstructure and Properties of the Composites: Hydroxyapatite With Addition of Zirconia Phase

[+] Author and Article Information
Agata Dudek

 Czestochowa University of Technology, Czestochowa, 42 200 Polanddudek@wip.pcz.pl

J. Eng. Mater. Technol 133(2), 021006 (Mar 04, 2011) (5 pages) doi:10.1115/1.4003104 History: Received December 11, 2009; Revised September 06, 2010; Published March 04, 2011; Online March 04, 2011

The group of bioceramics includes hydroxyapatites, which, due to their specific properties, are widely used in biotechnology. These compounds exist in skeletons of human and animal bodies. A range of advantages of implants, which contain, among other things, hydroxyapatites, results also from the level of their porosity. Recent trends that focus on the improvement in poor strength properties of HA coatings include the introduction of solid solution of Y2O3 in ZrO2 (Khalil, 2007, “Consolidation and Mechanical Properties of Nanostructured Hydroxyapatite Bioceramics by High Frequency Induction Heat Sintering,” Mater. Sci. Eng., 456, pp. 368–372; Chevalier, 2004, “Critical Effect of Cubic Phase on Aging in 3mol% Yttria-Stabilized Zirconia Ceramics for Hip Replacement Prothesis,” Biomaterials, 25, pp. 5539–5545; Inuzuka, 2004, “Hydroxyapatite-Deped Zirconia for Preparation of Biomedical Composites Ceramics,” Solid State Ionics, 172, pp. 509–513; Sung, Y. M., and Kim, D. H., 2003, “Crystallization Characteristics of Yttria-Stabilized Zirconia/Hydroxyapatite Composite Nanopowder,” J. Cryst. Growth, 254, pp. 411–417; Marciniak, J., 2002, Biomateriały, Wydawnictwo Politechniki Śląskiej, Gliwice, Poland; Park J., and Bronzino J. D., 2000, Biomaterials, CRC, Boca Raton, FL; Yoshida, 2006, “Fabrication of Structure-Controlled Hydroxyapatite/Zirconia Composite,” J. Eur. Ceram. Soc., 26, pp. 515–518). It seems essential to determine the resulting structural and strength properties in the aspect of further application of composites based on hydroxyapatite with the addition of the zirconia phase. The investigations involved ceramic composites based on HA with different amounts of the phase modified with ZrO2 yttrium dioxide.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Types of zirconium ceramics depending on modifying Y2O3 phase contents (4)

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Figure 2

Diagram of the mold used for powder sintering

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Figure 3

SEM microphotographs of the used powders: (a) hydroxyapatite powder and (b) powder of zirconium oxide modified with 8 wt %Y2O3

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Figure 4

Microstructure of HA sinter surface

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Figure 5

Microstructure of fissure in 50% HA+50% ZrO2 samples

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Figure 6

AFM image (tapping mode) of HA sinter surface: (a) 2D surface topography, (b) contrast resulting from changes in amplitude, (c) contrast resulting from changes in lever vibration phase, and (d) 3D surface topography

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Figure 7

AFM image (tapping mode) of 60% HA+40% ZrO2 sinter surface: (a) 2D surface topography, (b) contrast resulting from changes in amplitude, (c) contrast resulting from changes in lever vibration phase, and (d) 3D surface topography

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Figure 8

Relationship of mean grain size in HA+ZrO2 sinters

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Figure 9

Total porosity in HA+ZrO2 sinters versus content of HA phase

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Figure 10

Changes in HA+ZrO2 sinter density depending on percentage content of the zirconia phase before and after sintering

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Figure 11

The results of the scratch test carried out for the samples




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