Korean Journal of Materials Research, Vol.15, No.2, 134-138, February, 2005
양극산화와 열수처리한 니오비움 금속의 표면특성
Surface Characterization of Anodized and Hydrothermal Treated Niobium Metal
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This study was performed to investigate the surface properties of electrochemically oxidized pure niobium by anodic oxide and hydrothermal treatment technique. Niobium specimens of 10mm×10mm×1.0mm in dimension were polished sequentially from #600,#800,#1000 emery paper. The surface of pure niobium sperimens was anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 250 V and the current density was 10mA/cm 2 . The specimen was hydrothermal treated in high-pressure steam at 300 ? C for 2 hours using an autoclave. And all specimens were immersed in the in the Hanks' solution nth pH 7.4 at 37 ? C for 30 days. The surface of specimen was characterized by surface roughness, scanning electron microscope(SEM), energy dispersion X-ray analysis(EDX), X-ray photoemission spectroscopy(XPS) test. The value of surface roughness was the highest in the anodized sample and 0.41±0.04μm . The results of the SEM observation show that oxide layers of the multi porosity in the anodized sample were piled up on another, and hydroxyapatite crystal was precipitate from the surface of the hydrothermal treated sample. In the XPS analysis, O, Nb, C peak and small amounts of N peak were found in the polished specimens while Ca and P peak in addition to O, Nb, C and peak were observed in the hydrothermal treated sample.
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