Hydroxyapatite (HA)와 금속 분말 경사 코팅의 기계적 특성 및 생체 적합성 - 대기 열용사 경사코팅

• Published in: 대한금속·재료학회지, 47(1) pp. 13 - 20
• Main Authors: 김은혜, 김유찬, 한승희, 양석조, 박진우, 석현광
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.01.2009
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

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. KCI Citation Count: 6