Effect of Ti Intermediate Layer on Properties of HAp Plasma Sprayed Biocompatible Coatings
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The objective of this study was to improve properties of plasma sprayed HAp layer to titanium substrateby introducing an intermediate layer with two different methods. Before applying Zn doped HAp coatingon titanium substrate, an intermediate layer was introduced by titanium plasma spray or titanium anodization. Heat treatments were conducted for some samples after titanium intermediate layer was formed. Zn dopedHAp top layer was applied by plasma spraying. Three-point bending test and pull-off adhesion test wereperformed to determine the adhesion of Zn doped HAp coatings to substrates. Long-term credibility of Zndoped HAp plasma sprayed coatings on titanium was assessed by electrochemical impedance measurementsin Hanks’ solution. It was found that both titanium plasma sprayed and titanium anodized intermediate layerhad excellent credibility. Strong adhesion to the titanium substrate was confirmed after 12 weeks of immersionfor coating samples with titanium plasma sprayed intermediate layer. Samples with titanium anodized intermediatelayer showed good bending strength. However, they showed relatively poor resistance against pulling off. The thickness of titanium anodized intermediate layer can be controlled much more precisely than that ofplasma sprayed one, which is important for practical application.
Abstract
The objective of this study was to improve properties of plasma sprayed HAp layer to titanium substrateby introducing an intermediate layer with two different methods. Before applying Zn doped HAp coatingon titanium substrate, an intermediate layer was introduced by titanium plasma spray or titanium anodization. Heat treatments were conducted for some samples after titanium intermediate layer was formed. Zn dopedHAp top layer was applied by plasma spraying. Three-point bending test and pull-off adhesion test wereperformed to determine the adhesion of Zn doped HAp coatings to substrates. Long-term credibility of Zndoped HAp plasma sprayed coatings on titanium was assessed by electrochemical impedance measurementsin Hanks’ solution. It was found that both titanium plasma sprayed and titanium anodized intermediate layerhad excellent credibility. Strong adhesion to the titanium substrate was confirmed after 12 weeks of immersionfor coating samples with titanium plasma sprayed intermediate layer. Samples with titanium anodized intermediatelayer showed good bending strength. However, they showed relatively poor resistance against pulling off. The thickness of titanium anodized intermediate layer can be controlled much more precisely than that ofplasma sprayed one, which is important for practical application.
참고문헌 (12)
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