Characterizations of Ca- and Mg-incorporating micro/nano-structured surfaces on titanium fabricated by microarc oxidation and hydrothermal treatments. (December 2015)

• Record Type: Journal Article
• Authors: Ko, Sang-Hoon; Hwang, Moon-Jin; Moon, Won-Jin; Park, Yeong-Joon; Song, Ho-Jun
• Is Part Of: Journal of physics and chemistry of solids. Volume 87(2015:Dec.)
• Page Start: 147
• Page End: 152
• Publication Date: 2015-12
• Subjects: A. Microporous materials -- A. Nanostructures -- C. Electron microscopy -- D. Crystal structure; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2015.08.012
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: The micro/nano-surface characteristics of magnesium- and calcium-incorporating titanium oxide layers fabricated on titanium metal using microarc oxidation (MAO) and hydrothermal (HT) treatments were investigated. Calcium acetate monohydrate (CA), magnesium acetate monohydrate (MA), and β-glycerophosphoric acid disodium salt pentahydrate were used as electrolytes for MAO treatment of titanium disks. CA/MA electrolyte concentrations (all in M) were 0.2/0.0 (CA20–MAO), 0.15/0.05 (CA15MA5–MAO), 0.1/0.1 (CA10MA10–MAO), 0.05/0.15 (CA5MA15–MAO), and 0.0/0.2 (MA20–MAO). MAO–HT groups were prepared by hydrothermal treatment of MAO groups. The porous surface morphology was consistent even after HT treatment. The incorporation of Mg ions in the oxide layer during MAO treatment was more favorable than incorporation of Ca ions. However, Mg ions were released more rapidly than Ca ions after HT treatment. The anatase TiO2 structure was dominant for all the groups and an increase in the rutile TiO2 structure was observed with an increase in MA concentration. Nano-sized crystallites were observed on the porous surface for all MAO–HT groups. Nano-needle-like crystallites were observed on the surface of CA20–MAO–HT. The crystallites exhibited shorter and thicker characteristics with an increase in Mg concentration. Highlights: Mg- and Ca-incorporating titanium oxide layers fabricated on titanium metal. Nano-sized crystallites were formed on micro-porous oxide layer. Crystalline structure and morphology of oxide layer were affected by compositions of Ca and Mg.