期刊
SURFACE & COATINGS TECHNOLOGY
卷 205, 期 19, 页码 4732-4740出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2011.04.060
关键词
Plasma electrolytic oxidation; Wear resistance; Titanium alloy; Coating adhesion
资金
- Japan Society for the Promotion of Science [19206077]
- Grants-in-Aid for Scientific Research [19206077] Funding Source: KAKEN
Ti-15V-3Al-3Cr-35n (Ti-15-3) is one of the important practical titanium alloys with high cold deformability and high mechanical strength, but its wear resistance is poor. This paper reports the formation of wear-resistant and adhesive ceramic coatings on Ti-15-3 by two-step plasma electrolytic oxidation (PEO). The PEO of Ti-15-3 has been carried out first in alkaline aluminate electrolyte to form a wear-resistant oxide layer and then in acid electrolyte containing both phosphoric acid and sulfuric acid to improve adhesion of the coating. The coating formed in the alkaline aluminate electrolyte is more than 10 mu m thick, and highly crystalline. The main phase is Al2TiO5. This coating shows high wear resistance, but is not adherent to substrate due to the development of a number of voids and pores in the oxide layer close to the substrate. A new oxide layer with amorphous structure is formed next to the substrate in the subsequent PEO in the acid electrolyte, during which the voids are filled with a new oxide formed in the acid electrolyte, reducing the porosity. As a consequence, the adhesion of the coating is markedly improved without deteriorating the high wear resistance. (C) 2011 Elsevier B.V. All rights reserved.
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