scholarly journals Enhanced Properties of Micro Arc Oxidation Coating with Cu Addition on TC4 Alloy in Marine Environment

Coatings ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1168
Author(s):  
Wei Gao ◽  
Jiangnan Liu ◽  
Jingpeng Wei ◽  
Yuhong Yao ◽  
Xiqun Ma ◽  
...  
Keyword(s):  
Marine Environment ◽  
Antibacterial Effect ◽  
Antibacterial Property ◽  
Wear Property ◽  
Wear Performance ◽  
Hard Particles ◽  
Bactericidal Effects ◽  
Tc4 Alloy ◽  
Micro Arc Oxidation ◽  
Simulated Seawater

By contrast with the traditional method of adding hard particles into micro arc oxidation (MAO) coating to improve its wear performance, this study introduced copper into the MAO coating on TC4 alloy by adding copper pyrophosphate to enhance the wear property in a marine environment and the antibacterial property. The results demonstrated that the MAO coating with copper pyrophosphate addition showed a porous structure, and Cu was mainly concentrated around micropores. CuO and Cu2O were formed in this MAO coating. This MAO coating with Cu had a high bonding strength to the substrate. Although the hardness of the coating with Cu had been reduced, it could reduce the friction coefficient and enhance the wear property in simulated seawater due to the lubrication of Cu. Furthermore, this MAO coating with Cu addition had obvious antibacterial and bactericidal effects due to the antibacterial effect of Cu.

A Effects of Nano-Particles Additives on Wear Performance of Micro-Arc Oxidation Coating Prepared on 2A12 Aluminum Alloy

2015 ◽  
Vol 1120-1121 ◽  
pp. 735-739
Author(s):  
Ji Qiu ◽  
Xiang Bo Suo ◽  
Shi Ning Ma ◽  
Gang Shuai ◽  
Hong Mei Wang
Keyword(s):  
Aluminum Alloy ◽  
Friction And Wear ◽  
Composite Coatings ◽  
Nano Particles ◽  
Wear Property ◽  
Nano Particle ◽  
Wear Performance ◽  
Reinforced Composite ◽  
Micro Arc Oxidation ◽  
Particle Reinforced Composite

Nano-particle reinforced composite coatings were prepared on 2A12 aluminum alloy by micro-arc oxidation and the effect of nano particles on wear performance of coating was studied. By means of SEM, CETR micro-nano-indenter friction and wear tester and white-light interferometer, the surface morphology and the friction and wear property were tested. Results showed that compared with the coating without nano-particle addition, the size and amount of pores on coatings were decreased substantially after additon with 20nm nano-SiO2 particles, 80nm nano-SiO2 particles and 80nm nano-TiO2 particles, and the wear resistance of the micro-arc oxidation coating was improved.

scholarly journals Biological and antibacterial properties of the micro-nanostructured hydroxyapatite/chitosan coating on titanium

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Baoe Li ◽  
Xiaomei Xia ◽  
Miaoqi Guo ◽  
Yu Jiang ◽  
Yu Li ◽  
...  
Keyword(s):  
Composite Coating ◽  
Antibacterial Property ◽  
Antibacterial Properties ◽  
Dip Coating ◽  
Ha Coating ◽  
Coating Method ◽  
Micro Arc Oxidation ◽  
Promising Application ◽  
Sbf Solution ◽  
Dip Coating Method

Abstract Titanium (Ti) is the widely used implant material in clinic, however, failures still frequently occur due to its bioinertness and poor antibacterial property. To improve the biological and antibacterial properties of Ti implants, micro-nanostructured hydroxyapatite (HA) coating was prepared on Ti surface by micro-arc oxidation (MAO), and then the antibacterial agent of chitosan (CS) was loaded on the HA surface through dip-coating method. The results showed that the obtained HA/CS composite coating accelerated the formation of apatite layer in SBF solution, enhanced cell adhesion, spreading and proliferation, and it also inhibited the bacterial growth, showing improved biological and antibacterial properties. Although, with the increased CS amount, the coverage of HA coating would be enlarged, resulting in depressed biological property, however, the antibacterial property of the composite coating was enhanced, and the cytotoxicity about CS was not detected in this work. In conclusion, the HA/CS coating has promising application in orthopedics, dentistry and other biomedical devices.

A Study on the Antibacterial Property of the Extract from Apocynum Venetum

2011 ◽  
Vol 332-334 ◽  
pp. 164-167
Author(s):  
Zheng Li ◽  
Zhen Feng Dong ◽  
Jian Fei Zhang ◽  
Ji Xian Gong ◽  
Fan Jie Meng
Keyword(s):  
Escherichia Coli ◽  
Saccharomyces Cerevisiae ◽  
Staphylococcus Aureus ◽  
Aspergillus Niger ◽  
Antibacterial Effect ◽  
Antibacterial Property ◽  
Absolute Ethanol ◽  
Antibacterial Substance ◽  
Apocynum Venetum ◽  
Better Than

In order to determined the antibacterial property of Apocynum venetum. Three kinds of extractants (distilled water, 75% ethanol and absolute ethanol) were used to extract the leaf, stick and skin of Apocynum venetum, respectively. Flask and plate methods were used to evaluate the antibacterial property of these extracts on four kinds of classical microbiologies, Escherichia coli, Staphylococcus aureus, Saccharomyces cerevisiae and Aspergillus niger, respectively. The results showed that the antibacterial rate of extract by 75 % ethanol was better than extracts by water or absolute ethanol on Escherichia coli and skin contained more antibacterial substance (on Escherichia coli) than others. The antibacterial rate of extract by distill water was better than extracts by 75 % ethanol or absolute ethanol on Staphylococcus aureus and stick contained more antibacterial substance (on Staphylococcus aureus) than others. Some of extracts had very weak antibacterial rate on Saccharomyces cerevisiae and all extracts had not antibacterial effect on Aspergillus niger.

scholarly journals Effect of Different ZrN Addition on Microstructure and Wear Properties of Titanium Based Coatings by Laser Cladding Technique

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 261 ◽  
Author(s):  
Xiaodong Li ◽  
Shasha Liu ◽  
Jiawei Wang ◽  
Mengxiao Yu ◽  
Haibo Tang
Keyword(s):  
Wear Resistance ◽  
Spherical Shape ◽  
Dendritic Morphology ◽  
Wear Property ◽  
Wear Properties ◽  
Two Phase ◽  
Wear Performance ◽  
Tc11 Titanium Alloy ◽  
New Phase ◽  
Coating Hardness

In order to improve the wear resistance of TC11 titanium alloy, a mixture of ZrN (10 wt.%, 20 wt.%, 30 wt.%, and 40 wt.%) and TC11 alloy powders are laser cladded on a forged TC11 substrate. The microstructure and wear property of coatings are systematically analyzed. The results show that the microstructure of sample with 10 wt.% ZrN addition has a very fine α + β two-phase microstructure, powders of ZrN are fully melted with no new phase appearance. By increasing the amount of ZrN to 20 wt.%, new phases of TiN0.3 precipitate with the dendritic morphology in the coating. A further increase in ZrN to 30 wt.% and 40 wt.% do not significantly change the microstructure of the cladded layer but increase the microhardness significantly, phases of TiN form with further enhancement of coating hardness. At the bottom of the cladded layer, the morphology of TiN0.3 and TiN precipitations changes into a spherical shape with small size. However, the wear performance of the coatings gradually reduces due to the increase of brittleness, and the superior wear properties of the coating are achieved when sample consisted of 20 wt.% ZrN.

Synthesis and antibacterial property of Ag-containing TiO2 coatings by combining magnetron sputtering with micro-arc oxidation

2013 ◽  
Vol 235 ◽  
pp. 748-754 ◽  
Author(s):  
Xiangyu Zhang ◽  
Ruiqiang Hang ◽  
Haibo Wu ◽  
Xiaobo Huang ◽  
Yong Ma ◽  
...  
Keyword(s):  
Magnetron Sputtering ◽  
Antibacterial Property ◽  
Micro Arc Oxidation ◽  
Tio2 Coatings

Impedance Behavior of the Composite Coatings Prepared on Magnesium Alloy AZ91 in Simulated Seawater Solution

2014 ◽  
Vol 900 ◽  
pp. 526-530
Author(s):  
Wei Shang ◽  
Zhou Lan Yin ◽  
Yu Qing Wen ◽  
Xu Feng Wang
Keyword(s):  
Magnesium Alloy ◽  
Corrosion Protection ◽  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Composite Coatings ◽  
Sol Gel ◽  
Soaking Time ◽  
Magnesium Alloy Az91 ◽  
Micro Arc Oxidation ◽  
Simulated Seawater

The composite coatings were obtained on a magnesium alloy by micro-arc oxidation and sol-gel technique. Electrochemical impedance spectroscopy (EIS) was used to evaluate the corrosion behavior of MAO coating and composite coatings in a simulated seawater solution. The results show that corrosion behavior of the MAO coating and composite coatings are different at different immersion times. Corrosion protection of the MAO coating gradually weaken with the extension of soaking time, but corrosion protection of the composite coatings become stronger first and then weaken.

Effect of Thermal Oxidation Temperature on the Properties of Micro-Arc Oxidation Ceramic Coating on TC4 Alloy

2016 ◽  
Vol 697 ◽  
pp. 623-626
Author(s):  
Er Xin Ni ◽  
Ji Kang Yan ◽  
Yun Feng Wu ◽  
Yuan Teng ◽  
Zhi Cao Duan ◽  
...  
Keyword(s):  
Phase Composition ◽  
Surface Morphology ◽  
Thermal Oxidation ◽  
Ceramic Coating ◽  
Oxidation Temperature ◽  
Micro Hardness ◽  
Hardness Tester ◽  
Coating Surface ◽  
Tc4 Alloy ◽  
Micro Arc Oxidation

The effect of thermal oxidation temperature on the properties of MAO ceramic coating was investigated, The phase composition and surface morphology of composite oxidation coating were analyzed by XRD and SEM. The micro-hardness of composite oxidation coating were tested by micro hardness tester. The results shown that the composite oxidation coating consists of rutile, anatase Ti and HA. With the thermal oxidation temperature increasing, the micro-hardness of composite oxidation coatings were improved, but when the thermal oxidation temperature rose from 600 °C to 700 °C, the micro-hardness of coating dropped from 575 HV to 505 HV. With the thermal oxidation temperature increasing, the numbers of micro-porous on coating surface was decreased , and the composite oxidation coating became more density.

The Research on Wear Performance at Elevated Temperature of Ni-Based Infiltrated Layer

2010 ◽  
Vol 154-155 ◽  
pp. 1375-1378
Author(s):  
Gui Rong Yang ◽  
Xian Ming Sun ◽  
You He Zhou ◽  
Wen Ming Song ◽  
Ying Ma ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Raw Materials ◽  
Steel Substrate ◽  
Cast Steel ◽  
Wear Property ◽  
Low Temperature Oxidation ◽  
Wear Performance ◽  
Temperature Oxidation ◽  
Casting Technology ◽  
And Diffusion

The Ni-based alloy was used as raw materials to fabricate the surface infiltrated layer with 1-4mm thickness on cast steel substrate through vacuum infiltrated casting technology. The microstructure indicate that the infiltrated layer included surface melting and sintering layer, metallurgical fusion layer and diffusion layer. Wear property was investigated under different temperature conditions such as room temperature, 150°C, 300°C and 450°C. The results indicated that the abrasion volume of infiltrated layer was near to third of that of substrate, and it was nearly half of the substrate. This illuminated that the infiltrated had excellent wearable property. The adherence and fatigue abrasion was the main wear mechanism under low temperature. Oxidation abrasion and adherence dominated the wearing process under elevated temperature.

scholarly journals The Corrosion and Wear Behaviors of a Medium-Carbon Bainitic Steel Treated by Boro-Austempering Process

Metals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1959
Author(s):  
Man Liu ◽  
Wei Wang ◽  
Haijiang Hu ◽  
Feng Cai ◽  
Sheng Liu ◽  
...  
Keyword(s):  
Corrosion And Wear ◽  
Wear Property ◽  
Bainitic Steel ◽  
Wear Properties ◽  
Wear Performance ◽  
Medium Carbon ◽  
Electron Probe Micro Analyzer ◽  
Phase Coating ◽  
Kinetics Of ◽  
Electrode Technique

The effects of boro-austempering treatment on growth kinetics of borided layers, microstructure, and properties in a medium-carbon bainitic steel were investigated. The microstructure, distribution in coatings, corrosion, and wear properties of boro-austempered steels were characterized by a microscope, field-emission electron probe micro analyzer, scanning vibrating electrode technique system and wear resistance machine. The results show that the corrosion resistance of steels in different corrosive mediums was significantly enhanced by boro-austempering treatment. In addition, the wear performance of borided layers was improved by more than two times compared to bainitic substrates, proving a better wear property of samples treated through the boro-austempering route. The solubility of carbon and silicon in borides is very little. In addition, the dual-phase coating of FeB and Fe2B was observed, and the internal stress induced during the growth of Fe2B and FeB was almost eliminated. The preferential crystallographic growth directions of Fe2B and FeB are [001] and [010], respectively, which belongs to the (100) plane. Finally, the kinetics equation d2 = 0.125·t of the borided layers at 1223 K was established.

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