Preparation of self-lubricating composite coatings through a micro-arc plasma oxidation with graphite in electrolyte solution
| Autor: | Kung-Jeng Ma, Mohannad M.S. Al Bosta, Wei-Te Wu |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
education.field_of_study
Materials science Population Alloy Metallurgy chemistry.chemical_element Sodium silicate Surfaces and Interfaces General Chemistry Electrolyte engineering.material Condensed Matter Physics Microstructure Surfaces Coatings and Films chemistry.chemical_compound chemistry Coating Materials Chemistry engineering Graphite Composite material education Carbon |
| Zdroj: | Surface and Coatings Technology. 259:318-324 |
| ISSN: | 0257-8972 |
| DOI: | 10.1016/j.surfcoat.2014.03.004 |
| Popis: | In this study, low friction and wear resistant composite coatings were produced through the micro-arc oxidation (MAO) on 6061 aluminum alloy with graphite particles in alkali sodium silicate electrolyte solution. The ball-on-disk wear tests were performed in humid environment to investigate the friction and wear properties. The Al 2 O 3 , Al 2 OC, Al 4 C 3 , Al 4 O 4 C, and graphite phases were observed in a grown layer with graphite additives in electrolyte solution. The volcano-like microstructures were decreased in population and widened significantly in the sample prepared with the additive of graphite particles. For the sample prepared without graphite additives, the coating failure occurred after 1200 cycles, while the additive of graphite maintained the average of friction coefficient around 0.1, and reached a maximum of 0.12 after 15 000 cycles of wear test. The graphite and carbon containing lubricating phases trapped in the alumina matrix or crevices acted as micro/nano-reservoirs to maintain low friction and favor high endurance of the coating. |
| Databáze: | OpenAIRE |
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