期刊
THIN SOLID FILMS
卷 471, 期 1-2, 页码 194-199出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2004.06.096
关键词
microarc oxidation; phase composition; titanium alloy; coating
Ceramic coatings with 1100-1600 HK50 (g) hardness were deposited on Ti-6Al-4V alloy substrates using a microarc oxidation (MAO) technique, based on a dielectric barrier discharge created during anodic oxidation in an aqueous electrolyte. The influences of electrolyte concentration, deposition time and the cathodic to anodic current ratio Ic/Ia on phase composition and mechanical properties of the coatings have been studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis methods (EPMA), as well as microhardness measurement, direct pull-off and impact tests. The results show alpha-Al2O3 phase, which greatly improved the hardness of the coatings, can be obtained at high concentration of NaAlO2 and its relative content increases with decreasing Ic/Ia ratio. The direct pull-off test and impact test results indicate that the films have the excellent adhesion with the substrate. (C) 2004 Elsevier B.V. All rights reserved.
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