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The Mechanical Properties and Biocompatibility of Functionally Graded Coatings(FGC) of Hydroxyapatite(HA) and Metallic Powders - Functionally Gradient Coatings of Thermal Spray in Air-  

Kim, Eun-Hye (AMRC, Korea Institute of Science & Technology)
Kim, Yu-Chan (AMRC, Korea Institute of Science & Technology)
Han, Seung-hee (AMRC, Korea Institute of Science & Technology)
Yang, Seok-Jo (Department of Mechatronics Engineering, Chungnam National University)
Park, Jin-Woo (Department of Materials Science and Engineering, Yonsei University)
Seok, Hyun-Kwang (AMRC, Korea Institute of Science & Technology)
Publication Information
Korean Journal of Metals and Materials / v.47, no.1, 2009 , pp. 13-20 More about this Journal
Abstract
This work presents functionally graded coatings (FGC) of hydroxyapatite (HA) and metallic powders on Ti-6Al-4V implants using plasma spray coating method. HA has been the most frequently used coating material due to its excellent compatibility with human bones. However, because of the abrupt changes in thermomechanical properties between HA and the metallic implant across an interface, and residual stress induced on cooling from coating temperture to room temperature, debonding at the interface occurs in use sometimes. In this work, FGC of HA and Ti or Ti-alloy powders is made to mitigate the abrupt property changes at the interface and the effect of FGC on residual stress release is investigated by evaluating the mechanical bond strength between the implant and the HA coating layers. Thermal annealing is done after coating in order to crystallize the HA coating layer which tends to have amorphous structure during thermal spray coating. The effects of types and compositional ratio of metallic powders in FGC and annealing conditions on the bond strength are also evaluated by strength tests and the microstructure analysis of coating layers and interfaces. Finally, biocompatibility of the coating layers are tested under ISO 10993-5.
Keywords
plasma spray coating; functionally gradient coating; annealing; hydroxyapatite; bond strength; biocompatibility;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 5  (Related Records In Web of Science)
Times Cited By SCOPUS : 3
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