Calcium-hydroxide slurry processing for bioactive calcium-titanate coating on titanium

Naofumi Ohtsu, Chikage Abe, Tetsuya Ashino, Satoshi Semboshi, Kazuaki Wagatsuma

研究成果: Article査読

24 被引用数 (Scopus)

抄録

The present study investigates the relationships between the treatment conditions and characteristics of the surface layer in a surface treatment process using calcium-hydroxide slurry. Furthermore, the appropriate treatment conditions for preparing the bioactive coating are also investigated by soaking the specimens in a simulated body fluid. The treatment process using calcium-hydroxide slurry is as follows: a titanium substrate is buried in calcium hydroxide slurry, and the slurry is then heated at 873 K in air. The calcium hydroxide slurry was prepared by mixing 1 g of calcium hydroxide powder per 1, 1.2, 1.5, or 2 mL of water. The slurry was heated to 873 K with various heating rates from 100 to 600 K h- 1 and held at 873 K for 1 and 2 h. As the ratio of water in the slurry increased or the heating rate decreased, the atomic ratio of calcium to titanium in the surface layer decreased. A surface treatment using slurry containing a mixture of 1.0-mL water per 1.0-g calcium hydroxide powder, a heating rate of 600 K h- 1, and a holding time of 2 h produces a crystallized stoichiometric calcium titanate layer on the titanium substrate. Treatment using slurry of a higher water ratio or a slower heating ratio results in the formation of a dioxide layer containing locally formed calcium titanate. On the crystallized calcium titanate layer, calcium phosphate is formed faster in a simulated body fluid than in the TiO2 layer containing calcium titanate; therefore, the treatment conditions forming the crystallized calcium titanate layer are appropriate for the bioactive coating.

本文言語English
ページ(範囲)5110-5115
ページ数6
ジャーナルSurface and Coatings Technology
202
21
DOI
出版ステータスPublished - 2008 7月 30

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 表面および界面
  • 表面、皮膜および薄膜
  • 材料化学

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