Preparation and Properties of Microarc Oxidation Self-Lubricating Composite Coatings on Aluminum Alloy
| Autor: | Shichun Di, Zhenwei Li |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
lcsh:TN1-997
Materials science cathode current density Alloy Composite number chemistry.chemical_element 02 engineering and technology engineering.material wear resistance 01 natural sciences 2024-T4 aluminum alloy microarc oxidation PTFE adhesion strength Aluminium 0103 physical sciences General Materials Science Ceramic lcsh:Mining engineering. Metallurgy 010302 applied physics Abrasive Metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Microstructure chemistry visual_art Conversion coating Vickers hardness test visual_art.visual_art_medium engineering 0210 nano-technology |
| Zdroj: | Metals; Volume 7; Issue 4; Pages: 127 Metals, Vol 7, Iss 4, p 127 (2017) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met7040127 |
| Popis: | Microarc oxidation (MAO) coatings were prepared on 2024-T4 aluminum alloy using pulsed bipolar power supply at different cathode current densities. The MAO ceramic coatings contained many crater-like micropores and a small number of microcracks. After the MAO coatings were formed, the coated samples were immersed into a water-based Polytetrafluoroethylene (PTFE) dispersion. The micropores and microcracks on the surface of the MAO coatings were filled with PTFE dispersion for preparing MAO self-lubricating composite coatings. The microstructure and properties of MAO coatings and the wear resistance of microarc oxidation self-lubricating composite coatings were analyzed by SEM, laser confocal microscope, X-ray diffractometry (XRD), Vickers hardness test, scratch test and ball-on-disc abrasive tests, respectively. The results revealed that the wear rates of the MAO coatings decreased significantly with an increase in cathode current density. Compared to the MAO coatings, the microarc oxidation self-lubricating composite coatings exhibited a lower friction coefficient and lower wear rates. |
| Databáze: | OpenAIRE |
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