Microstructure and Tribological Properties of Microarc Oxidation Coatings on Al-Si Alloy
Microarc oxidation(MAO) was used to prepare the coatings on the surface of Al-Si alloy. Besides, scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD) were utilized to research the microstructure characteristics, the components distribution, and the phase compositions, for the microarc oxidation coatings on Al-Si alloys. Furthermore, the growth process and wear properties of the coatings were explored. Results indicated that:the phase compositions of microarc oxidized coating consisted of mullite (3Al2O3·2SiO2), α- Al2O3 and γ- Al2O3. With the increase of load, the friction coefficient of the coating decreased, however it was greater than that of Al-Si alloy substrate. The wear resistance of the coating were one time higher than that of the substrate.
C. Lu et al., "Microstructure and Tribological Properties of Microarc Oxidation Coatings on Al-Si Alloy", Key Engineering Materials, Vol. 703, pp. 112-118, 2016