The effect of the shape and size of the pores on the mechanical properties of porous HAP-based bioceramics

In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The nu...

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Bibliographic Details
Published in:	Ceramics international Vol. 37; no. 2; pp. 471 - 479
Main Authors:	VeljoviAe, Dj, JanAeiAe-Hajneman, R, BalaAe, I, JokiAe, B, PutiAe, S, PetroviAe, R, JanaAekoviAe, Dj
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-03-2011
Subjects:	B. Porosity Bioceramics Ceramics Finite element modeling Fracture toughness Hydroxyapatite Image analysis Mathematical analysis Mechanical properties Porosity Sintering (powder metallurgy) Unit cell B. Porosity Hydroxyapatite Finite element modeling Fracture toughness
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Summary:	In this study, the influence of the shape and size of the pores on the mechanical properties of the obtained porous HAP-based bioceramics was investigated. The porous HAP-based bioceramics were obtained starting from spherical calcium hydroxyapatite powder, obtained by hydrothermal syntheses. The number of shapeless inter-agglomerate pores decreased and amount of spherical intra-agglomerate pores increased on increasing the sintering temperature from 1100 °C to 1250 °C. The shape of pores also changed with thermal treatment of specimens; the small pores remained spherical while the larger pores became more spherical in shape, as was proved by image analysis. A three-dimensional, finite element unit cell model was applied to evaluate the influence of pore shape on the mechanical strength of HAP ceramics. By analyzing the effect of the shape of pores to the fracture toughness of sintered porous HAP bioceramics, it was observed that the more spherical the pores were, the tougher became the bioceramics. After sintering at 1250 °C for 2 h, measured toughness was 1.31 MPa m 1/2, which is a relatively high value for this type of bioceramics.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0272-8842 1873-3956
DOI:	10.1016/j.ceramint.2010.09.014