생체용 Ti합금의 부식특성에 미치는 Zr 함량의 영향

Abstract

The purpose of this study was to develop new dental Ti-Zr alloys having an excellent mechanical properties, good corrosion resistance and biocompatibility. Microstructure properties and corrosion resistance obtained the as-cast and homogenized Ti-xZr alloys were useful for application to biomaterial. Ti containing Zr up to 10, 20, 30 and 40wt% was many time melted to improve chemical homogeneity using vacuum furnace and homogenized for 24h at 1000℃ in argon atmosphere. Phase constitutions and microstructure of the samples were characterized by XRD(X-Ray Diffractometry) and OM(Optical Microscopy), SEM(Scanning Electron Microscopy), respectively. The corrosion properties of the samples were examined through potenti- odynamic, potentioststic test in artificial saliva. The results were as follows: 1) In as-cast and homogenized Ti-xZr samples, α-phase was identified by XRD. 2) Microstructure properties observed by SEM and OM changed from lamellar structure to needle-like structure with increasing Zr content. 3) From the results of polarization behavior in the Ti-xZr alloys, it was found that the corrosion resistance was increased with increasing Zr content. 4) In the passive stability test, current density-time curves indicated that current density of homogenized treatment rather than as-cast treatment was significantly decreased with the increasing time and it offers good surface stability. The current density was decreased with increasing Zr content.