Journal
SURFACE & COATINGS TECHNOLOGY
Volume 240, Issue -, Pages 96-102Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2013.12.021
Keywords
Plasma anodising; Wear; X-ray diffraction; Electron backscatter diffraction analysis; Phase analysis
Funding
- European Union (European Regional Development Fund)
- Free State of Saxony
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In the recent decades, various process windows have been found for plasma anodising of aluminium surfaces to produce wear-resistant alumina coatings. The coatings offer a high hardness and provide an excellent bonding to the substrate material, thus preventing spallation under mechanical or tribological load. In the present study, coatings with a high abrasive wear resistance and a hardness of up to 12 GPa were produced in an electrolyte of 5 g/1 sodium metasilicate and 5 g/1 potassium hydroxide at a current density of 30 A/dm(2). To understand the reasons for the high wear resistance, the morphology as well as the phase composition and distribution within the coating were examined globally and locally using X-ray diffraction with conventional and grazing incidence and electron backscatter diffraction. The analyses show that the coating globally is comprised of approximately one third of alpha-alumina, one third of gamma-alumina and one third of amorphous alumina with locally varying phase content. (c) 2013 Elsevier B.V. All rights reserved.
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