The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
권호 표지

EFFECT OF ELECTROLYTE CONCENTRATION ON THE SURFACE CHARACTERISTICS OF ANODIZED AND HYDROTHERMALLY-TREATED TI-6AL-7NB ALLOY

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

  • Jang Tae-Yeob (Department of Prosthodontics, School of Dentistry and Institute of Oral Biosciences, Chonbuk National University) ;
  • Song Kwang-Yeob (Department of Prosthodontics, School of Dentistry and Institute of Oral Biosciences, Chonbuk National University) ;
  • Bae Tae-Sung (Department of Dental Materials, School of Dentistry and Institute of Oral Biosciences, Chonbuk National University)
  • 장태엽 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 송광엽 (전북대학교 치과대학 치과보철학교실 및 구강생체과학연구소) ;
  • 배태성 (전북대학교 치과대학 치과재료학교실 및 구강생체과학연구소)
  • Published : 2005.10.01
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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 and 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 $50^{\circ}C$ for 24 hours. Anodizing was performed at current density $30mA/cm^2$ 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 $300^{\circ}C$ for 2 hours using a autoclave. All samples were soaked in the Hanks' solution with pH 7.4 at $36.5^{\circ}C$ for 30 days. Results and 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 $TiO_2$ 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.

Keywords

References

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