Characteristics of grain growth of microarc oxidation coatings on pure titanium
Wang Jian-Bo (汪剑波)a, Wu Han-Hua (吴汉华)ac, Li Quan-Jun (李全军)ab, Li Zhe-Kui (李哲奎)b, Gu Guang-Rui (顾广瑞)b, Lü Xian-Yi (吕宪义)a, Zheng Wei-Tao (郑伟涛)d, Jin Zeng-Sun (金曾孙)a
a State Key Laboratory for Superhard Materials, Jilin University, Changchun 130012, China; b College of Science and Engineering, Yanbian University, Yanji 133002, China; c College of Physics, Jilin University, Changchun 130021, China; d Department of Materials Science, Jilin University, Changchun 130012, China
Abstract Grainy titania coatings are prepared by microarc oxidation on pure titanium (TA2) substrates in a Na$_{2}$SiO$_{3}$--NaF electrolytic solution. The coating thickness is measured by an optical microscope with a CCD camera. Scanning electron microscope (SEM) and x-ray diffraction (XRD) are employed to characterize the microstructure and phase composition of coatings. The results show that the coating thickness increases linearly as the treatment time increases. The coatings are mainly composed of anatase and rutile (TiO$_{2})$. With the increase of treatment time, the predominant phase composition varies from anatase to rutile, which indicates that phase transformation of anatase into rutile occurs in the oxidizing process. Meanwhile, the size of grains existing on the coating surface increases and thus the surface becomes much coarser.
Received: 17 May 2005
Revised: 29 August 2005
Accepted manuscript online:
PACS:
81.15.-z
(Methods of deposition of films and coatings; film growth and epitaxy)
Wang Jian-Bo (汪剑波), Wu Han-Hua (吴汉华), Li Quan-Jun (李全军), Li Zhe-Kui (李哲奎), Gu Guang-Rui (顾广瑞), Lü Xian-Yi (吕宪义), Zheng Wei-Tao (郑伟涛), Jin Zeng-Sun (金曾孙) Characteristics of grain growth of microarc oxidation coatings on pure titanium 2005 Chinese Physics 14 2598
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