期刊
APPLIED SURFACE SCIENCE
卷 257, 期 8, 页码 3404-3411出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2010.11.034
关键词
Titanium; Sphene; Titania; Microarc oxidation; Heat-treatment
类别
资金
- National Natural Science Foundation of China [50872025, 51002039]
- China Postdoctoral Science Foundation
- Heilongjiang Province Postdoctoral Science Foundation
Sphene/titania composite coatings were fabricated on titanium by a hybrid technique of microarc oxidation (MAO) and heat treatment. The high-applied voltages promote the formation of sphene in the MAO coatings after heat-treatment. Heat treatment could change the surface morphology of the MAO coatings such as roughness, macropores size and density and the thickness of the MAO coatings. Increasing the heat-treatment temperature decreased the atomic concentration ratios of Ti/Si and Ti/Ca of the MAO coatings. The chemical states of Ti4+, Ca2+, Si2+ and O2- were observed on all the coatings. Additionally, Ti2+ was detected in the MAO and heat-treated MAO coatings at 600 and 700 degrees C. The heat-treatment has obvious effect on the chemical states of Si, Ti and O elements due to the formation of sphene and oxidation of TiO phase of the MAO coating, but did not affect that of Ca. In the heat-treated MAO coatings at 800 degrees C (MAO-H8), the titanium surface shows a MAO top layer and oxidized interior layer. A concentration gradient in components in the MAO layer of the MAO-H8 coating was formed. (C) 2010 Elsevier B.V. All rights reserved.
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