양극산화 처리된 Ti-Nb합금의 표면 특성

Abstract

In order to investigate the surface characteristics of anodized Ti-xNb alloy, the Ti containing Nb up to 3wt%, 20wt% and 40wt% were melted by using a vacuum furnace. The samples were cut and polished for surface roughness test and anodizing and then homogenized for 24 hr at 1050℃. And then titanium anodic oxide layer was formed on the specimen surface in an electrolytic solution of 1M phosphoric acid at constant current densities(0.3A/㎠) by anodizing method. The effect of Nb content on the pore size, the morphology and crystallinity of Ti oxide layer formed by the anodic oxidation method was investigated. Microstructural morphology, crystallinity, composition and surface roughness of oxide layer were observed by scanning electron microscopy(SEM) and X-ray diffractometer(XRD), Energy-dispersive spectrometer(EDS) and roughness tester, respectively. These result are as follow : 1. The structure of alloy were changed from α-phase to β-phase with increase of Nb content. 2. From XRD results, the structure of TiO2 formed on the Ti-xNb surface was anatase, intensities of TiNbO4, TiNb2O7 peak increased as Nb content increased, but intensity of TiO2 peak decreased. 3. Surface roughness test and SEM results, pore size formed on surface and surface roughness decreased as Nb content increased. 4. Line analysis results, intensity of Ti peak was high in center of pore, whereas, intensity of O peak was high in outside of pore center.