中国物理B ›› 2005, Vol. 14 ›› Issue (12): 2598-2601.doi: 10.1088/1009-1963/14/12/036

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Characteristics of grain growth of microarc oxidation coatings on pure titanium

李哲奎1, 顾广瑞1, 郑伟涛2, 汪剑波3, 吕宪义3, 金曾孙3, 吴汉华4, 李全军5   

  1. (1)College of Science and Engineering, Yanbian University, Yanji 133002, China; (2)Department of Materials Science, Jilin University, Changchun 130012, China; (3)State Key Laboratory for Superhard Materials, Jilin University,Changchun 130012, China; (4)State Key Laboratory for Superhard Materials, Jilin University,Changchun 130012, China;College of Physics, Jilin University, Changchun 130021, China; (5)State Key Laboratory for Superhard Materials, Jilin University,Changchun 130012, China;College
  • 收稿日期:2005-05-17 修回日期:2005-08-29 出版日期:2005-12-20 发布日期:2005-12-20

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    

  1. 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
  • Received:2005-05-17 Revised:2005-08-29 Online:2005-12-20 Published:2005-12-20

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摘要： 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.

关键词: microarc oxidation, grain growth, microstructure, phase composition

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.

Key words: microarc oxidation, grain growth, microstructure, phase composition

中图分类号:  (Methods of deposition of films and coatings; film growth and epitaxy)

  • 81.15.-z
81.65.Mq (Oxidation) 64.60.-i (General studies of phase transitions)