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KMID : 0988720050210010033
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2005 Volume.21 No. 1 p.33 ~ p.42
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Surface Characteristics of Anodized and Hydrothermally-Treated Ti-6Al-7Nb Alloy
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Kim Mun-Young
Song Kwang-Yeob
Bae Tae-Sung
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Abstract
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This study was performed to investigate the surface properties and in vitro biocompatibility of electrochemically oxidized Ti-6Al-7Nb alloy by anodic spark discharge technique. Discs of Ti-6Al-7Nb alloy of 20 ㎜ in diameter and 2 ㎜ in thickness were polished sequentially from #300 to 1000 SiC paper, ultrasonically washed with acetone and distilled water for 5 min, and dried in an oven at 50℃ for 24 hours. Anodizing was performed using a regulated DC power supply. The applied voltages were given at 240, 280, 320, and 360 V and current density of 30 ㎃/㎠. Hydrothermal treatment was conducted by high pressure steam at 300℃ for 2 hours using a autoclave. Samples were soaked in the Hanks’ solution with pH 7.4 at 36.5℃ during 30 days. The results obtained were summarized as follows; 1. The oxide films were porous with pore size of 1～5 ㎛. The size of micropores increased with increasing the spark forming voltage. 2. The main crystal structure of the anodic oxide film was anatase type as analyzed with thin-film X-ray diffractometery. 3. Needle-like hydroxyapatite (HA) crystals were observed on anodic oxide films after hydrothermal treatment at 300℃ for 2 hours. The precipitation of HA crystals was accelerated with increasing the spark forming voltage. 4. The precipitation of the fine asperity-like HA crystals were observed after being immersed in Hanks‘ solution at 37℃. The precipitation of HA crystals was accelerated with increasing the spark forming voltage and the time of immersion in Hanks’ solution. 5. The Ca/P ratio of the precipitated HA layer was equivalent to that of HA crystal as increasing the spark forming voltage and the time of immersion in Hanks’ solution.
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