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Fabrication, chemical etching, and compressive strength of porous biomimetic SiC for medical implants

Published online by Cambridge University Press:  31 January 2011

Carmen Torres-Raya ,
David Hernandez-Maldonado ,
Joaquin Ramirez-Rico ,
Carmen Garcia-Gañan ,
Antonio R. de Arellano-Lopez  and
Julian Martinez-Fernandez
Carmen Torres-Raya
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
David Hernandez-Maldonado
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
Joaquin Ramirez-Rico*
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
Carmen Garcia-Gañan
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
Antonio R. de Arellano-Lopez
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
Julian Martinez-Fernandez
Affiliation:
Dpto. Física de la Materia Condensada-ICMSE, Universidad de Sevilla-CSIC 41012 Sevilla, Spain
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

BioSiC is a biomimetic SiC-based ceramic material fabricated by Si melt infiltration of carbon preforms obtained from wood. The microstructure of bioSiC mimics that of the wood precursor, which can be chosen for tailored properties. When the remaining, unreacted Si is removed, a SiC material with interconnected porosity is obtained. This porous bioSiC is under study for its use as a medical implant material. We have successfully fabricated bioSiC from Sipo wood and studied the kinetics of Si removal by wet etching. The results suggest that the reaction is diffusion-limited, and the etch rate follows a t−0.5 law. The etching rate is found to be anisotropic, which can be explained attending to the anisotropy of the pore distribution. The compressive strength was studied as a function of etching time, and the results show a quadratic dependence with density. In the attainable range of densities, the strength is similar or better than that of human bone.

Keywords

Biomimetic (assembly)Cellular (material type)Ceramic
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 12: Biomimetic and Bio-enabled Materials Science and Engineering , December 2008 , pp. 3247 - 3254
Copyright
Copyright © Materials Research Society 2008

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