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      주제어 : anodic spark deposition (검색결과 3 건)
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      • 양극산화 불꽃방전 처리한 Ti, Nb,Ta 산화피막의 특성

        원대희,배태성,김동환,이용승 한국생체재료학회 2003 생체재료학회지 Vol.7 No.3

        This study was performed to investigate the surface properties of electrochemically oxidized pure titanium, niobium and tantalum by anodic spark discharge technique. Titanium, niobium and tantalum rods were ultrasonically washed in 0.1% HF for 2 minutes and they were anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 300 V and the current density was 30 mA/cm2. Specimens were immersed in 5.0 M NaOH solution at 60oC for 24 hours, heated at 600oC for 1 hour, and soaked in Hanks' solution at 37oC for 15 days. The microstructure of the surface oxide films were investigated by scanning electron microscope (SEM) and surface roughness tester. The electrochemical characteristics were investigated by potentiodynamic method in 0.9% NaCl solution. The atomic percent of Ca and P was investigated by energy dispersive X-ray microanalyzer (EDX). The highest Ra value of 1.38 m was observed in the niobium specimen. The value of corrosion current density tends to be low after the treatment of anodic oxidation. The lowest Ca/P ratio of 1.47 was obtained in the niobium specimen after immersion in Hanks' solution for 15 days.

      • KCI등재

        양극산화와 절연파괴로 형성한 인산칼슘 함유 티타늄 산화피막의 특성

        최원호,이용승,김동환,권용훈,배태성 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.1

        This study was performed to investigate the surface properties of electrochemically oxidized pure titanium by anodic spark deposition technique. Titanium plates of 10×10×1 ㎜ were polished sequentially from # 300 to # 1,000 emery paper. They were ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. Titanium plates and titanium screw implants were anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 190-340 V and the current density was 30 ㎃/㎠. The surface oxide film was characterized by X-ray deffractometer(XRD), scanning electron microscope(SEM) and X-ray photoemission spectroscopy(XPS). The main crystal structure of the titanium oxide was anatase type as analyzed with thin-film X-ray diffractometery. The diameter of micropores increased with increasing the spark forming voltage. The porous coatings showed the growth of cell structure and more compact texture with increasing the spark forming voltage. Microcracks were examined in the coating formed at voltage of 340 V. Ca/P ratio in coatings was increased with increasing the voltage.

      • KCI등재

        양극산화와 절연파괴로 형성한 Ti-6Al-7Nb 합금의 산화피막 특성 평가

        윤수연,이호진,배태성,송광엽 大韓齒科器材學會 2003 대한치과재료학회지 Vol.30 No.3

        This study was performed to investigate the surface properties of electrochemically oxidized Ti-6Al-7Nb by anodic spark deposition technique. Discs of titanium alloy Ti-6Al-lNb of 20 mm in diameter and 2 mm in thickness were polished sequentially from #300 to #1,000 emery paper. They were ultrasonically washed in ethyl alcohol and acetone for 5 min and dried in a desiccator. Ti-6Al-7Nb was anodized in an electrolytic solution that was dissolved calcium and phosphate in water. The electrolytic voltage was set in the range of 170-320 V and the current density was 30 mA/cm^2. The surface oxide film was characterized by X-ray diffractometer, scanning electron microscope (SEM) and X-ray photoemission spectroscopy (XPS). The results obtained were summarized as follows; The main crystal structure of the titanium oxide was anatase type as analyzed with thin-film X-ray diffractometery. The coatings were porous with Pore diameter of 1~4 ㎛. The diameter of micropores increased with increasing the spark forming voltage. The porous coatings showed the growth of cell structure and more compact texture with increasing the voltage. Ca/P ratio in coatings was increased with increasing the voltage.

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