Oxidation and Wear Resistance of Ni-Y2O3-ZrO2 Nanocomposite Coating Prepared by Ultrasonic Electrodeposition

2010 ◽  
Vol 455 ◽  
pp. 427-430 ◽  
Author(s):  
Yu Jun Xue ◽  
Chen Shen ◽  
Ji Shun Li ◽  
Yi Liu
Keyword(s):  
Wear Resistance ◽  
Electron Microscope ◽  
Zirconium Oxide ◽  
High Temperature Oxidation ◽  
Energy Dispersive Spectrometer ◽  
Nanocomposite Coating ◽  
Zro2 Nanoparticles ◽  
Environmental Scanning ◽  
Temperature Oxidation ◽  
Scanning Electron

Ni-Y2O3-ZrO2 nanocomposite coating was prepared by co-deposition of nickel, Yttrium oxide (Y2O3) and zirconium oxide (ZrO2) nanoparticles using ultrasonic electrodeopsition. The surface morphology and composition of coatings were ananlyzed by an environmental scanning electron microscope (ESEM) and energy dispersive spectrometer(EDS). The high temperature oxidation, microhardness and wear resistance of the coatings were investigated. It is found that both the incorporation of nanoparticles and the use of ultrasonic could refine Ni crystal grains and improve properties of the coatings. The Ni-Y2O3-ZrO2 nanocomposite coating prepared with ultrasonic exhibits finer grains, higher microhardness and better oxidation and wear resistance.

Effects of MgO Addition Level on Microstructure and Wear Resistance of Ni-WC Vacuum Fusion Sintering Coating

2010 ◽  
Vol 154-155 ◽  
pp. 942-945 ◽  
Author(s):  
Ya Nan Wang ◽  
Li Ying Han ◽  
Xiao Da Wang
Keyword(s):  
Wear Resistance ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Base Metal ◽  
Energy Dispersive Spectrometer ◽  
Longitudinal Section ◽  
Surface Microstructure ◽  
Compound Coatings ◽  
Addition Level ◽  
Scanning Electron

Ni-WC-MgO compound coatings were made by way of Vacuum Fusion Sintering (VFS). Effects of MgO addition level on the microstructures of coating surface and longitudinal section, element diffusion in fusion sintering area and wear resistance were analyzed through scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The results showed as the following: MgO addition made coating and matrix combined closely; there existed obvious transition region. When the addition level of MgO was 0.5%, the coating had the fewest defects and best combination. Ni, Cr, W, C and other elements in the coating diffused to the direction of the base metal while Fe in the base metal diffused to the coating, during which the diffusion of Fe and Ni was most obvious at the junction. Therefore, when the addition level of MgO was 0.5%, the surface microstructure of the coating was the densest and finest, and the wear resistance of the coating was the best.

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.

Microstructure and Formation Mechanism of Aluminized Coatings on Nickel-Based Superalloys

2008 ◽  
Vol 373-374 ◽  
pp. 204-207 ◽  
Author(s):  
Ji Bin Pei ◽  
Li Wen Zhang ◽  
Jing Niu ◽  
Quan Zhong Zhang
Keyword(s):  
Electron Microscope ◽  
Formation Mechanism ◽  
Electron Probe ◽  
High Temperature Oxidation ◽  
Aluminum Concentration ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
X Ray ◽  
Nickel Based Superalloy ◽  
Scanning Electron

Aluminized coatings prepared on nickel-based superalloys can provide good protection against high temperature oxidation and hot corrosion. This study investigated the simple aluminized and silicon-aluminized coatings on nickel-based superalloy K4104. The simple aluminized coating was prepared by pack cementation and the Al-Si coating was prepared by slurry aluminizing, respectively. The microstructure of simple aluminized and Al-Si coatings was analyzed by means of scanning electron microscope (SEM), X-ray diffraction (XRD) and electron probe microanalysis (EPMA). And the formation mechanism of simple aluminized and Al-Si coatings was discussed. The results showed that the simple aluminized coating was about 49 um thick and consisted of three layers. The outer layer mainly consisted of Al-rich β-NiAl. The intermediate layer consisted of Ni-rich β-NiAl and Cr-rich. The inner diffusion layer consisted of Cr-rich and γ’-Ni3Al. The microstructure of Al-Si coating showed that the coating was about 70 um thick and consisted of five layers. The Al-Si coating consisted of CrxSiy, Al-rich β-NiAl, Ni-rich β-NiAl, Cr-rich and γ’-Ni3Al. The microstructure of simple aluminized coating was compared with that of Al-Si coating in order to find out the effect of Si. Owing to the effect of Si, there was a Transition layer in Al-Si coating. The Al-Si coating was thicker than simple aluminized coating. The declining trend of the aluminum concentration in the Al-Si coating was smoother than that of the simple aluminized coating.

Universal ESEM

1993 ◽  
Vol 51 ◽  
pp. 786-787
Author(s):  
G.D. Danilatos
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
High Vacuum ◽  
Natural Extension ◽  
Necessary Condition ◽  
Environmental Scanning ◽  
Detection Systems ◽  
Small Gain ◽  
Detection Medium ◽  
Scanning Electron

The environmental scanning electron microscope (ESEM) has evolved as the natural extension of the scanning electron microscope (SEM), both historically and technologically. ESEM allows the introduction of a gaseous environment in the specimen chamber, whereas SEM operates in vacuum. One of the detection systems in ESEM, namely, the gaseous detection device (GDD) is based on the presence of gas as a detection medium. This might be interpreted as a necessary condition for the ESEM to remain operational and, hence, one might have to change instruments for operation at low or high vacuum. Initially, we may maintain the presence of a conventional secondary electron (E-T) detector in a "stand-by" position to switch on when the vacuum becomes satisfactory for its operation. However, the "rough" or "low vacuum" range of pressure may still be considered as inaccessible by both the GDD and the E-T detector, because the former has presumably very small gain and the latter still breaks down.

Microstructure and microanalysis of sintered Fe-Nd-B permanent magnets

1990 ◽  
Vol 48 (4) ◽  
pp. 990-991
Author(s):  
Mahesh Chandramouli
Keyword(s):  
Electron Microscope ◽  
Liquid Phase ◽  
Permanent Magnets ◽  
Phase Distribution ◽  
Energy Dispersive Spectrometer ◽  
Nucleation And Growth ◽  
Liquid Phase Sintering ◽  
Domain Wall Energy ◽  
Oxide Phases ◽  
Scanning Electron

Magnetization reversal in sintered Fe-Nd-B, a complex, multiphase material, occurs by nucleation and growth of reverse domains making the isolation of the ferromagnetic Fe14Nd2B grains by other nonmagnetic phases crucial. The magnets used in this study were slightly rich in Nd (in comparison to Fe14Nd2B) to promote the formation of Nd-oxides at multigrain junctions and incorporated Dy80Al20 as a liquid phase sintering addition. Dy has been shown to increase the domain wall energy thus making nucleation more difficult while Al is thought to improve the wettability of the Nd-oxide phases.Bulk polished samples were examined in a JEOL 35CF scanning electron microscope (SEM) operated at 30keV equipped with a Be window energy dispersive spectrometer (EDS) detector in order to determine the phase distribution.

CARLSON ALLOY NITRONIC 60

Alloy Digest ◽  
2009 ◽  
Vol 58 (2) ◽  
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Nickel Alloys ◽  
High Temperature Oxidation ◽  
Lower Cost ◽  
Impact Resistance ◽  
Corrosion And Wear ◽  
Temperature Oxidation ◽  
High Nickel ◽  
Temperature Impact

Abstract CARLSON ALLOY NITRONIC 60 is a galling- and wear-resistant austenitic stainless steel that provides a significantly lower-cost alternative to cobalt-bearing and high-nickel alloys. Corrosion resistance is superior to 304 in most media. Approximately twice the yield strength of 340 and 316. Possesses excellent high-temperature oxidation resistance and low-temperature impact resistance. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion and wear resistance as well as forming. Filing Code: SS-1029. Producer or source: G.O. Carlson Inc.

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