전해질 농도가 양극산화와 열수처리한 TI-6Al-7Nb 합금의 표면 특성에 미치는 영향

장태엽; 송광엽; 배태성

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전해질 농도가 양극산화와 열수처리한 TI-6Al-7Nb 합금의 표면 특성에 미치는 영향
Effect of electrolyte concentration on the surface characteristics of anodized and hydrothermally-treated TI-6Al-7Nb alloy

대한치과보철학회지 2005년 43권 5호 p.684 ~ 693

장태엽, 송광엽, 배태성,

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장태엽 ( Jang Tae-Yeob ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
송광엽 ( Song Kwang-Yeob ) - 전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소
배태성 ( Bae Tae-Sung ) - 전북대학교 치과대학 치과재료학교실

KMID : 0362420050430050684

Abstract

Statement of problem: Ti-6Al-7Nb alloy is used instead of Ti-6Al-4V alloy that was known to have toxicity.

Purpose: This study was performed to investigate the effect of electrolyte concentration on the surface characteristics of anodized and hydrothermally-treated Ti-6Al-7Nb alloy.

Materials & Methods: Discs of Ti-6Al-7Nb alloy of 20 mm in diameter and 2 mm in thickness were polished sequentially from 300 to 1,000 SiC paper, ultrasonically washed with acetone and distilled water for 5 min, and dried in an oven at 50 degrees C for 24 hours. Anodizing was performed at current density 30 mA/cm2 up to 300 V in electrolyte solutions containing beta-glycerophosphate disodium salt hydrate (beta-GP) and calcium acetate (CA). Hydrothermal treatment was conducted by high pressure steam at 300 degrees C for 2 hours using a autoclave. All samples were soaked in the Hanks’ solution with pH 7.4 at 36.5 degrees C for 30 days.

Results & Conclusion: The results obtained were summarized as follows; 1. After hydrothermal treatment, the precipitated HA crystals showed the dense fine needle shape. However, with increasing the concentration of electrolyte they showed the shape of thick and short rod. 2. When the dense fine needle shape crystals was appeared after hydrothermal treatment, the precipitation of HA crystals in Hanks’ solution was highly accelerated. 3. The crystal structures of TiO2 in anodic oxide film were composed of strong anatase peak and weak rutile peak as analyzed with thin-film X-ray diffractometery. 4. The Ca/P ratio of the precipitated HA layer was equivalent to that of HA crystal in Hanks’ solution.