Elaboration of self-coating alumina-based porous ceramics |
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Authors: | Laurent Gremillard Romaric Casadei Eduardo Saiz Antoni P Tomsia |
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Affiliation: | (1) Physical Metallurgy and Materials Sciences Group (GEMPPM), National Institute for Applied Science (INSA), Lyon, France;(2) Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA |
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Abstract: | Materials used for bone substitution (i.e. hydroxyapatite and calcium phosphate) are highly successful, since when implanted
they provide an efficient scaffold that can be colonized by the patient’s bone. However, their poor mechanical properties
impede their use for load-bearing applications. In contrast, no material with high mechanical properties also presents a high
bioactivity. A possible way of finding a material both strong and bioactive is to use a composite. We propose here a composite
deriving its strength from its alumina core and its bioactivity from a calcium phosphate surface. Ceramic scaffolds have been
produced by infiltration of polymer open-celled foams. Several compositions of the slurries have been tested, leading to the
realization of porous pieces with a biocompatibility gradient at a micrometric scale. The mechanical properties of several
new materials are presented and correlated to their microstructure. |
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