Abstract
Bioactive capability of Ti-alloy for implant application has been developed by producing thin hydroxyapatite (HAp) film on its surface. The adhesive strength between the base metal and the HAp film has to be evaluated to ensure the reliability of the implant. But the method of evaluation is not yet established because of its difficulty to cause adhesive fracture between base metal and HAp thin film. In this chapter, tensile load is applied to the HAp film on Ti-6Al-4V alloy substrate normal to its thickness by using a specimen bonded with adhesives. Surfactant is applied near the interface between Ti-6Al-4V substrate and HAp film by adhesives to avoid coverage of the interface. Thus the accuracy of this method is improved by preventing adhesive overflow from bonded surface to the side of the specimen. As a result, fracture occurs at interface between Ti-alloy and the HAp film. This method is proved to be useful for evaluating bond strength between Ti-alloy and HAp film and verifying the fracture of the adhesive layer.
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