2015
DOI: 10.1016/j.surfcoat.2015.02.047
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The influence of phase gradient within the micro arc oxidation (MAO) coatings on mechanical and tribological behaviors

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Cited by 45 publications
(18 citation statements)
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“…Figure 7A,B illustrates the XRD spectra of MAO coatings and harder yet high load-bearing hexagonal/rhombohedral (α) alumina phase exemplifies a finely graded composite. [35][36][37] Such a phase gradient composite coating, even with occluded porosity in the bulk of the coating (shown in Figure 5) as created by the microscopic short-lived volcanic discharge events (shown in Figure 4), exhibits hardness in the range of 13 to 18 GPa together with extremely superior wear and corrosion resistance than the traditional HA coatings as reported earlier, which is understandable. 31,[38][39][40] Despite the presence of an interesting phase composition leading to enhanced wear and corrosion protection of Al alloys, it is noteworthy that the fatigue performance of MAO coatings is still significantly poorer than the corresponding Al alloy as discussed in detail in the following section.…”
Section: Phase Constituentssupporting
confidence: 51%
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“…Figure 7A,B illustrates the XRD spectra of MAO coatings and harder yet high load-bearing hexagonal/rhombohedral (α) alumina phase exemplifies a finely graded composite. [35][36][37] Such a phase gradient composite coating, even with occluded porosity in the bulk of the coating (shown in Figure 5) as created by the microscopic short-lived volcanic discharge events (shown in Figure 4), exhibits hardness in the range of 13 to 18 GPa together with extremely superior wear and corrosion resistance than the traditional HA coatings as reported earlier, which is understandable. 31,[38][39][40] Despite the presence of an interesting phase composition leading to enhanced wear and corrosion protection of Al alloys, it is noteworthy that the fatigue performance of MAO coatings is still significantly poorer than the corresponding Al alloy as discussed in detail in the following section.…”
Section: Phase Constituentssupporting
confidence: 51%
“…Figure A,B illustrates the XRD spectra of MAO coatings deposited on 2024‐T3 and 7075‐T6 Al alloys, respectively. It is clear that the MAO coatings predominantly contain γ‐Al 2 O 3 and α‐Al 2 O 3 phases wherein the relative proportion of γ‐Al 2 O 3 is more on the coating surface and is gradually replaced by α‐Al 2 O 3 phase as previously reported . Such a combination of relatively softer cubic (γ) alumina phase and harder yet high load‐bearing hexagonal/rhombohedral (α) alumina phase exemplifies a finely graded composite .…”
Section: Resultsmentioning
confidence: 70%
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“…The Al 2 O 3 coatings are considered to be the typical representative of oxide ceramic coatings [4]. The previous studies were focused on the strength-toughness enhancement of the Al 2 O 3 coatings, including porosity control [5], metal phase addition [6], other oxide solution [7][8][9], structure nano-crystallization [10], component or structure gradient [11] and post processing [12]. However, some problems exist in the above-mentioned property improvement methods: (1) limited effects of porosity change; (2) obviously decreased hardness and strength of the coating due to the metal phase addition;…”
Section: Introductionmentioning
confidence: 99%
“…The wear mechanism is mainly microplowing and delamination. At 900 • C, the worn surfaces of the coatings are covered with the glaze film and have obvious plastic deformation (Figures 11c,f,i; Liu et al, 2013;Krishna et al, 2015). After 1,100 • C heat treatment, the worn surface of the coating is covered with a continuous glaze film.…”
Section: Worn Surface Morphologies Of Coatings At Different Temperaturesmentioning
confidence: 99%