scholarly journals Effect of Anode Pulse-Width on the Microstructure and Wear Resistance of Microarc Oxidation Coatings

Metals ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 243 ◽  
Author(s):  
Zhen-Wei Li ◽  
Shi-Chun Di
Keyword(s):  
Wear Resistance ◽  
Pulse Width ◽  
Microarc Oxidation ◽  
Anode Pulse

scholarly journals Tribological Characteristics Improvement of Wear Resistant MAO-Coatings

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
V. N. Malyshev ◽  
A. M. Volkhin ◽  
B. M. Gantimirov
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Surface Layer ◽  
Erosion Resistance ◽  
Economic Effect ◽  
Microarc Oxidation ◽  
Tribological Characteristics ◽  
High Wear Resistance ◽  
Technology Improvement ◽  
Coating Formation

Currently, the most promising technology of coating formation is microarc oxidation (MAO) with unique properties of the surface layer, which combine high wear resistance, corrosion resistance, and heat and erosion resistance. Microarc oxidation can be used for parts and components manufacturing in various segments of industries. However, the technology improvement by improving the tribological characteristics of MAO-coatings can not only enhance economic effect, but also expand its application.

Synthesis, corrosion, and wear resistance of a black microarc oxidation coating on pure titanium

2020 ◽  
Vol 386 ◽  
pp. 125454 ◽  
Author(s):  
Qiaoqin Guo ◽  
Dapeng Xu ◽  
Wei Yang ◽  
Yongchun Guo ◽  
Zhong Yang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Pure Titanium ◽  
Microarc Oxidation ◽  
Corrosion And Wear

WEAR RESISTANCE OF AZ91D MAGNESIUM ALLOY WITH AND WITHOUT MICROARC OXIDATION COATING AND Ti6Al4V ALLOY IN ARTIFICIAL SALIVA

2009 ◽  
Vol 16 (06) ◽  
pp. 821-830 ◽  
Author(s):  
X. P. ZHANG ◽  
Y. S. ZOU ◽  
F. M. WU ◽  
Z. P. ZHAO ◽  
L. YOU ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Wear Mechanisms ◽  
Room Temperature ◽  
Artificial Saliva ◽  
Microarc Oxidation ◽  
Alloy Sample ◽  
Az91d Alloy ◽  
Oxidation Treatment ◽  
Az91d Magnesium Alloy

The wear resistances of AZ91D magnesium alloy with and without microarc oxidation (MAO) coating and Ti 6 Al 4 V alloy in artificial saliva were investigated at room temperature. The wear resistance of AZ91D magnesium alloy in artificial saliva was significantly improved after microarc oxidation treatment. The volume loss of untreated AZ91D magnesium alloy sample was 20.95 times of that of AZ91D magnesium alloy with MAO coating, and that of Ti 6 Al 4 V was 5.42 times of that of MAO. Furthermore, the wear resistance of AZ91D magnesium alloy was lower than that of Ti 6 Al 4 V alloy in artificial saliva. The wear mechanisms of AZ91D magnesium and Ti 6 Al 4 V were discussed. It was found that the wear mechanism of the MAO was associated with abrasion and microfracture. There were two dominative wear mechanisms for AZ91D alloy and Ti 6 Al 4 V alloy under the loading conditions used in the experiment, namely, micro-machining wear and deformation-induced wear.

Investigation of Microstructure and Properties of Ni/CNT Nanocrystalline Coating Deposited by Brush Plating

2007 ◽  
Author(s):  
Jun Tan ◽  
Tiantian Yu ◽  
Binshi Xu ◽  
Bin Zhu
Keyword(s):  
Carbon Nanotubes ◽  
Grain Size ◽  
Wear Resistance ◽  
Direct Current ◽  
Pulse Width ◽  
Pulse Current ◽  
Heating Temperature ◽  
Current Source ◽  
Average Grain Size ◽  
Brush Plating

Nickle-carbon nanotube (Ni/CNT) nanocrystalline coatings with different parameter were prepared by brush plating. The carbon nanotubes were added into common nickel solution for brush plating and ball milling was used to disperse the carbon nanotubes in the solusion. The concentration of carbon nanotubes in the solution was 3 g/l. The SEM and XRD were applied to investigate the grain size, microstructure and morphology of the coatings. The hardness and the wear mass loss of the coatings were examined on micro hardness tester and ball on disk tribotester. The results show that under a direct-current source, the grain size of the Ni/CNT coating was about 20 nm. Under a pulse-current source, the grain size of the Ni/CNT coatings decreased and the coatings gained smoother surface when the pulse-width became shorter. The grain size of the Ni/CNT coating increased with the heating temperature increasing and the average grain size of the coating heated at 500 degrees centigrade was over 50 nm. The microhardness of the Ni/CNT coating under a pulse-current source was higher than that of the coating under a direct-current source. Under a pulse-current source, the microhardness of the Ni/CNT coating increased when the pulse-width became shorter. The microhardness of the Ni/CNT coating changed slightly below 300 degrees centigrade, while decreased obviously after heated up to 400 degrees centigrade. The wear resistance of the Ni/CNT coating under a pulse-current was higher than that of the coating under a direct-current. Under a pulse-current, the wear resistance of the Ni/CNT coating increased when the pulse-width became shorter.

Microstructure and Tribological Properties of Microarc Oxidation Coatings on Al-Si Alloy

2016 ◽  
Vol 703 ◽  
pp. 112-118
Author(s):  
Chuang Lu ◽  
Fa Qin Xie ◽  
Li Ping Zhu
Keyword(s):  
Wear Resistance ◽  
Electron Microscope ◽  
Growth Process ◽  
Energy Dispersive Spectrometer ◽  
Microarc Oxidation ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Microstructure Characteristics ◽  
Scanning Electron

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.

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