Anti-Wear Coating Grown by Micro-Plasma Oxidation on Aluminum Alloys in the Solution of Aluminate-Titania

2011 ◽  
Vol 239-242 ◽  
pp. 667-670 ◽  
Author(s):  
Li Gong Zhang ◽  
Gui Mei Zhao ◽  
Xiao Ming Lai
Keyword(s):  
Aluminum Alloys ◽  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Wear Property ◽  
Plasma Oxidation ◽  
X Ray Diffraction ◽  
Electrolytic Solution ◽  
X Ray ◽  
Hardness Tester ◽  
Wear Coating

In this paper, Aluminum trioxide ceramic coatings were grown on surfaces of 2024 Aluminum alloys by micro-plasma oxidation in an aluminate electrolytic solution. In order to decrease the density of the pores and increase the anti-wear property of the ceramic coatings, Titania were added into the aluminate electrolytic solution. The struture and anti-wear property of the produced ceramic coatings were measured by X-ray diffraction, scanning electron microscope , hardness tester and frictionometer. The results show that the thickness of the ceramic coating is about 24±1 μm, surfaces of the ceramic coatings are very uniform. The hardness of the doped coating is up to 930 HV, and the wear property of the coating is the more excellent than that of undoped coating.

Wear Resistance of Al2O3, Al2O3-40wt.%TiO2 Coatings Prepared by Plasma Spraying on H13 Hot-Worked Die Steel

2012 ◽  
Vol 538-541 ◽  
pp. 235-238 ◽  
Author(s):  
Ren Guo Song ◽  
Pu Hong Tang ◽  
Chao Wang ◽  
Guo Lu
Keyword(s):  
Wear Resistance ◽  
Plasma Spraying ◽  
Ceramic Coatings ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Die Steel ◽  
X Ray ◽  
Hardness Tester ◽  
Plasma Sprayed ◽  
Scanning Electron

Al2O3 and Al2O3-40wt.%TiO2 ceramic coatings on H13 hot-worked die steel have been prepared by plasma spraying, and then the microstructure, micro-hardness as well as wear resistance of the prepared coatings have been investigated by means of x-ray diffraction (XRD), scanning electron microscope (SEM), Vickers hardness tester and ball-on-disk high temperature tribometer. The results showed that the plasma sprayed ceramic coatings are of higher hardness and wear resistance than H13 hot-worked die steel.

MICROSTRUCTURE AND WEAR PROPERTY OF Ti/C MODIFIED LAYERS ON Ti–6Al–4V SUBSTRATE

2019 ◽  
Vol 27 (06) ◽  
pp. 1950162
Author(s):  
DANDAN MA ◽  
YONG MA ◽  
AILAN FAN ◽  
YONGSHENG WANG ◽  
SHENGWANG YU ◽  
...  
Keyword(s):  
Wear Property ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Particle Structure ◽  
X Ray ◽  
Hardness Tester ◽  
Metallurgical Bonding ◽  
Modified Layer ◽  
Friction Performance ◽  
Glow Plasma

The Ti/C modified layers were prepared on Ti–6Al–4V alloy by double glow plasma surface alloying technique. The microstructure and composition of the modified layers were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM). The bonding strength, micro-hardness and friction performance of the modified layers were examined by the scratch tester, micro-hardness tester, reciprocating wear tester, and white light interferometer. The results show that both of the microstructure and properties of the Ti/C modified layer get the remarkable effects when the temperature reaches 910∘C. Belonging to metallurgical bonding with the substrate, the modified layer possesses a continuous, compact and uniform packet-like particle structure. Compared with the Ti–6Al–4V substrate, the surface micro-hardness and wear resistance of Ti/C modified layer are significantly improved.

Nano-SiC Modified Plasma Sprayed Ceramic Coatings Prepared by Laser Sintering

2008 ◽  
Vol 375-376 ◽  
pp. 348-352 ◽  
Author(s):  
Zong Jun Tian ◽  
Li Da Shen ◽  
Yin Hui Huang ◽  
Guo Ran Hua
Keyword(s):  
Ceramic Coating ◽  
Ceramic Coatings ◽  
Laser Sintering ◽  
Laser Remelting ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bond Coating ◽  
Plasma Sprayed ◽  
Steel Substrates ◽  
Electronic Microscope

This paper describes an investigation of nano-SiC reinforced ceramic coating, which has included NiCrAl and Al2O3+13wt%TiO2 coatings pre-produced by atmosphere plasma spraying, implemented by laser sintering. Commercial NiCrAl powders were plasma sprayed onto 45 steel substrates to produce a bond coating with thickness of ~100μm. The Al2O3-TiO2 based coating with ~500μm thickness was then plasma sprayed on top of the NiCrAl bond coating. With CO2 laser, nano-SiC powders were laser sintered on Al2O3-TiO2 based coatings. The microstructure and chemical composition of the modified based coatings were analyzed by such detection devices as scanning electronic microscope (SEM) and x-ray diffraction (XRD). The results show that the size of SiC grains has no obvious growth. In addition, due to the nanostructured SiC phase and laser remelting, the modified coatings exhibited better abrasion resistance than those unmodified samples.

Effect of oxidation time on the microstructure and properties of ceramic coatings prepared by microarc oxidation on 7A04 superhard aluminum alloy

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744026
Author(s):  
Feng Xiao ◽  
Hui Chen ◽  
Jingguo Miao ◽  
Juan Du
Keyword(s):  
Aluminum Alloy ◽  
Microarc Oxidation ◽  
Ceramic Coatings ◽  
Ceramic Layer ◽  
X Ray Diffraction ◽  
Oxidation Treatment ◽  
X Ray ◽  
Metallurgical Bonding ◽  
Dense Ceramic ◽  
Morphology Of Surface

Under the sodium aluminates’ system, microarc oxidation treatment was conducted on the superhard aluminum alloy 7A04 for different times. The microstructure of microarc oxidation ceramic layer was investigated by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The influences of different oxidation times on the adhesion strength of ceramic layer and substrate, the morphology of surface and cross-section, the phase composition and the electrochemical properties were studied. The results indicated that the connection of the coating and substrate appears to be metallurgical bonding and dense ceramic layer, and the surface is in a “volcanic vent” morphology, which is composed of [Formula: see text]-Al2O3 and little [Formula: see text]-Al2O3. The corrosion resistance of ceramic layer is improved significantly in contrast with that of the substrate.

Two Novel One-dimensional Inorganic-Organic Hybrids Constructed from [H2W12O40]6– Clusters and Lanthanide-organic Complexes: [(C5H5N-CO2)2Ln(H2O)3]2[H2W12O40]·nH2O (C5H5N-CO2 = Pyridine-4-carboxylate; Ln = La3+, n = 5; Ce3+, n = 7)

2008 ◽  
Vol 63 (1) ◽  
pp. 16-22 ◽  
Author(s):  
Hai-jun Pang ◽  
Ya-guang Chen ◽  
Fan-xia Meng ◽  
Dong-mei Shi
Keyword(s):  
Lanthanide Complexes ◽  
Rare Earth Compounds ◽  
Bidentate Ligands ◽  
X Ray Diffraction ◽  
Electrolytic Solution ◽  
One Dimensional ◽  
X Ray ◽  
Notable Effect ◽  
Organic Complexes ◽  
Elemental Analyses

Two novel polyoxotungstate-based rare earth compounds, [(C5H5N-CO2)2Ln(H2O)3]2- [H2W12O40] · nH2O (C5H5N-CO2 = pyridine-4-carboxylate; Ln = La3+ (1), n = 5; Ce3+ (2), n = 7), have been synthesized in aqueous solution and characterized by single-crystal X-ray diffraction, elemental analyses, IR spectra and TG analyses. The isostructural compounds 1 and 2 exhibit onedimensional (1D) zig-zag chains, in which the dinuclear lanthanide complexes act as bridging linkers and the [H2W12O40]6− groups serve as bidentate ligands. The results of cyclic voltammetry (CV) show that compounds 1 and 2 undergo two two-electron redox processes, similar to that of the parent (NH4)6[H2W12O40] ·3H2O, and also reveal that the pH of the supporting electrolytic solution has a notable effect on the electrochemical behavior of compound 2.

IMPROVED NITRIDING CAPABILITY OF NONALLOYED STEELS ASSISTED WITH ACTIVE SCREEN PLASMA TREATMENT

2019 ◽  
Vol 27 (03) ◽  
pp. 1950118 ◽  
Author(s):  
M. NAEEM ◽  
H. A. RAZA ◽  
M. SHAFIQ ◽  
FARHAT SHABBIR ◽  
JAVED IQBAL ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Cost Effective ◽  
Additional Treatment ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardness Tester ◽  
Polarization Test ◽  
Pin On Disc ◽  
Scanning Electron ◽  
Active Screen

The nonalloyed steels are very cost-effective, but their usefulness in numerous applications is imbedded due to low mechanical strength. The strength of several steels can be improved by nitriding; however, nonalloyed steels are not suitable. They can be nitrided by introducing special nitriding alloys (like chromium, aluminum, etc.) during manufacturing or some interlayer deposition, but it is quite expensive. The aim of this study is to improve nitriding capability of nonalloyed steels without any additional treatment. This is done by using alloyed stainless steel active screen in active screen plasma treatment, which provides an adequate amount of chromium to form stable and hard nitrides. The processed samples are characterized by X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy, pin-on-disc wear tester, hardness tester and potentiodynamic polarization test.

The Effects of Mn Addition on Microstructure and Properties in 6061 Aluminium Alloy

2011 ◽  
Vol 399-401 ◽  
pp. 1838-1842
Author(s):  
You Bin Wang ◽  
Jian Min Zeng
Keyword(s):  
Heat Treatment ◽  
Aluminium Alloy ◽  
X Ray Diffraction ◽  
6061 Aluminum Alloy ◽  
X Ray ◽  
T6 Heat Treatment ◽  
Hardness Tester ◽  
Mn Content ◽  
The Mean ◽  
6061 Aluminium Alloy

The effects of Mn addition on the microstructure and hardness of 6061 aluminum alloy were studied by means of scanning electron microscope (SEM) , energy dispersive X-Ray Analysis (EDX), X-ray diffraction (XRD) and hardness tester in this work. The results shows that rod and fishbone AlSiFeMn phase will be formed in the alloy with Mn addition in 6061 aluminium alloy, and the AlSiFeMn phase increases with the increasing of Mn content . By the mean of XRD, the Al4.07 Mn Si0.74 phase is found in the 6061 aluminium alloy from 0.7% to 1.5% Mn. The hardness increases with the increasing of Mn contents both for as-cast and for T6 heat treatment. However, the hardness growth rate for as-cast is much more than that for T6 heat treatment at the same Mn addition in the 6061 alloy. Mn has a little effect on the hardness for T6 heat treatment in 6061 alloy.

Study on Aging Strengthening of Mg-Zn-Cu Alloy Based on Component Optimization Design

2016 ◽  
Vol 873 ◽  
pp. 33-37
Author(s):  
Jie Ye ◽  
Xiao Ping Lin ◽  
Yun Dong ◽  
Bo Li ◽  
Gao Peng Xu ◽  
...  
Keyword(s):  
Optimization Design ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Strengthening Phase ◽  
X Ray ◽  
Hardness Tester ◽  
Cu Alloy ◽  
Factsage Software ◽  
Kinetics Of ◽  
Zn Alloy

In this study, we investigated the aging strengthening of Mg-Zn-Cu alloy based on component optimization design by FactSage software, optical microscope (OM), X-ray diffraction (XRD) and Vickers hardness tester. The results show that the precipitation rate of MgZn2 phase in Mg-6Zn-1Cu is significantly higher than that of the other alloys. When Mg-6Zn-1Cu alloy is subjected to aging at 160<strong>°C</strong> for different time, the phase consists of α-Mg, MgCu2 and MgZn2. The content of main strengthening phase MgZn2 is increasing with the prolonging of aging time. When Mg-6Zn-1Cu alloy aged at 160<strong>°</strong><strong>C</strong> for 10h, the kinetics of precipitation is considerably accelerated. The results indicate that the hardening produced in the Cu-containing alloy is considerably higher than in the Mg-Zn alloy. Therefore, based on component optimization design to establish Mg-Zn-Cu alloy solidification database, and to predict the phase equilibrium and thermodynamic properties of the alloy, is an effective method for the development of new magnesium alloy.

Formation of Aluminum Nitride Films by Gas Nitriding

2014 ◽  
Vol 625 ◽  
pp. 651-656 ◽  
Author(s):  
Masashi Yoshida ◽  
Zhou Tao ◽  
Noah Utsumi
Keyword(s):  
Aluminum Alloys ◽  
Aluminum Nitride ◽  
Electron Probe ◽  
Treatment Time ◽  
Film Surface ◽  
Nitride Film ◽  
X Ray Diffraction ◽  
Good Adhesion ◽  
X Ray ◽  
Gas Nitriding

In this study, aluminum alloys were subjected to nitriding at 823 K for 0–18.0 ks using alumina and magnesium powders for improving their radiation performance. After nitriding, aluminum nitride films were formed on the aluminum substrate. The thickness of the formed films varied from 1.5 to 11 μm, and the color of the film surface was dark brown or black. The thickness of the aluminum nitride film increased with an increase in the treatment time. X-ray diffraction and electron probe microanalysis results showed that the film was composed of aluminum nitride, alumina, aluminum, and magnesium. Further, the film showed good adhesion at 0 ks.

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