Thermal spraying of functionally graded calcium phosphate coatings for biomedical implants |
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Authors: | Y Wang K A Khor P Cheang |
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Affiliation: | (1) Nanyang Technological University, 63 9798 Singapore, Singapore |
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Abstract: | Biomedical requirements in a prosthesis are often complex and diverse in nature. Biomaterials for implants have to display
a wide range of adaptability to suit the various stages of the bio-integration process of any foreign material into the human
body. Often, a combination of materials is needed. The preparation of a functionally graded bioceramic coating composed of
essentially calcium phosphate compounds is explored. The coating is graded in accordance to adhesive strength, bioactivity,
and bioresorbability. The bond coat on the Ti-6Al-4V stub is deposited with a particle range of the hydroxyapatite (HA) that
will provide a high adhesive strength and bioactivity but have poor bioresorption properties. The top coat, however, is composed
of predominantly α-tricalcium phosphate (α-TCP) that is highly bioresorbable. This arrangement has the propensity of allowing
accelerated bio-integration of the coating by the body tissues as the top layer is rapidly resorbed, leaving the more bioactive
intermediate layer to facilitate the much needed bioactive properties for proper osteoconduction. The processing steps and
problems are highlighted, as well as the results of post-spray heat treatment. |
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Keywords: | α -tricalcium phosphate calcium phosphates functionally graded materials (FGM) hydroxyapatite plasma spraying |
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