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1.
In previous studies, it has been demonstrated that nanostructured Al2O3-13 wt.%TiO2 coatings deposited via air plasma spray (APS) exhibit higher wear resistance when compared to that of conventional coatings.
This study aimed to verify if high-velocity oxy-fuel (HVOF)-sprayed Al2O3-13 wt.%TiO2 coatings produced using hybrid (nano + submicron) powders could improve even further the already recognized good wear properties
of the APS nanostructured coatings. According to the abrasion test results (ASTM G 64), there was an improvement in wear performance
by a factor of 8 for the HVOF-sprayed hybrid coating as compared to the best performing APS conventional coating. When comparing
both hybrid and conventional HVOF-sprayed coatings, there was an improvement in wear performance by a factor of 4 when using
the hybrid material. The results show a significant antiwear improvement provided by the hybrid material. Scanning electron
microscopy (SEM) at low/high magnifications showed the distinctive microstructure of the HVOF-sprayed hybrid coating, which
helps to explain its excellent wear performance.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
2.
Thermal spraying is a widely used technology for industrial applications to provide coatings that improve the surface characteristics.
According to the specificities of processes (APS, VPS, flame, electric arc), any kind of material can be sprayed. Among materials,
ceramic coatings present several interesting aspects such as wear resistance, corrosion protection as well as thermal or electrical
insulation; particularly alumina coatings which appear as the most commonly used. From all spraying processes, atmospheric
plasma spraying (APS) is a rather well-established process but some others can also be used with a lower economical impact
such as the flame technology. The aim of this study was to analyze the alumina coating properties according to the technology
employed such as APS or wire flame spraying using the Rokide™ and the Master Jet? guns. After micrographic analyses by SEM, physical and mechanical properties were measured considering the thermal conductivity
and the hardness.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
3.
Eric Irissou Jean-Gabriel Legoux Bernard Arsenault Christian Moreau 《Journal of Thermal Spray Technology》2007,16(5-6):661-668
Coating build-up mechanisms and properties of cold-sprayed aluminum-alumina cermets were investigated using two spherical
aluminum powders having average diameters of 36 and 81 μm. Those powders were blended with alumina at several concentrations.
Coatings were produced using a commercial low-pressure cold spray system. Powders and coatings were characterized by electronic
microscopy and microhardness measurements. In-flight particle velocities were monitored for all powders. The deposition efficiency
was measured for all experimental conditions. Coating performance and properties were investigated by performing bond strength
test, abrasion test, and corrosion tests, namely, salt spray and alternated immersion in saltwater tests. These coating properties
were correlated to the alumina fraction either in the starting powder or in the coating.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
4.
L. Jackson M. Ivosevic R. Knight R. A. Cairncross 《Journal of Thermal Spray Technology》2007,16(5-6):927-932
Polymer and polymer/ceramic composite coatings were produced by ball-milling 60 μm Nylon-11 together with nominal 10 vol.%
of nano and multiscale ceramic reinforcements and by HVOF spraying these composite feedstocks onto steel substrates to produce
semicrystalline micron and nanoscale reinforced polymer matrix composites. Room temperature dry sliding wear performance of
pure Nylon-11, Nylon-11 reinforced with 7 nm silica, and multiscale Nylon-11/silica composite coatings incorporating 7-40 nm
and 10 μm ceramic particles were characterized using a pin-on-disk tribometer. Coefficient of friction and wear rate were
determined as a function of applied load and coating composition. Surface profilometry and scanning electron microscopy were
used to characterize and analyze the coatings and wear scars. The pure Nylon-11 coating experienced less wear than the composites
due to the occurrence of two additional wear mechanisms: abrasive and fatigue wear.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
5.
This article reports on a series of experiments with various high-velocity oxygen fuel spray systems (Jet Kote, Top Gun, Diamond
Jet (DJ) Standard, DJ 2600 and 2700, JP-5000, Top Gun-K) using different WC-Co and WC-Co-Cr powders. The microstructure and
phase composition of powders and coatings were analyzed by optical and scanning electron microscopy and x-ray diffraction.
Carbon and oxygen content of the coatings were determined to study the decarburization and oxidation of the material during
the spray process. Coatings were also characterized by their hardness, bond strength, abrasive wear, and corrosion resistance.
The results demonstrate that the powders exhibit various degrees of phase transformation during the spray process depending
on type of powder, spray system, and spray parameters. Within a relatively wide range, the extent of phase transformation
has only little effect on coating properties. Therefore, coatings of high hardness and wear resistance can be produced with
all HVOF spray systems when the proper spray powder and process parameters are chosen.
This paper originally appeared in Thermal Spray: Meeting the Challenges of the 21st Century; Proceedings of the 15th International Thermal Spray Conference, C. Coddet, Ed., ASM International, Materials Park, OH, 1998. This proceedings paper has been extensively reviewed according
to the editorial policy of the Journal of Thermal Spray Technology. 相似文献
6.
Stephan Siegmann Philippe Kern Lukas Rohr Partha P. Bandyopadhyay 《Journal of Thermal Spray Technology》2007,16(5-6):947-953
This investigation deals with a study of the friction, wear, and corrosion behavior of vacuum plasma sprayed quasicrystalline
(QC) Ti41.5Zr41.5Ni17 coatings. During pin on disc experiments, a change in the mode of wear has been found to occur with corresponding changes
in normal load and sliding velocity. The low thermal conductivity of quasicrystals and its brittleness play a vital role in
determining the friction and wear behavior of such materials. When these coatings are subjected to rubbing for a longer period
of time, wear occurs by subsurface crack propagation, and subsequent delamination within the coated layer. By comparing the
QC to its polycrystalline counterpart during potentiodynamic measurements according to ASTM G 31, higher currents were found
over the whole range of potentials for QC when immersed in 1 M HCl solution.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
7.
L. C. Erickson T. Troczynski H. M. Hawthorne H. Tai D. Ross 《Journal of Thermal Spray Technology》1999,8(3):421-426
A series of plasma sprayed coatings of controlled microstructure was obtained by spraying three monosize sapphire powders
using an axial injection torch in which the plasma gas composition and nozzle diameter were the only processing parameters
varied. The effects of changes in these parameters on the coating splat morphology, porosity, angular crack distribution,
and hardness are reported. The uniform, dense microstructure and the high hardness of 14 GPa (a level usually only associated
with chromia thermal spray coatings) of the best alumina coatings resulted from using tightly controlled processing conditions
and monodispersed precursor powders. The microstructural quality of plasma sprayed coatings and, hence, the coating properties
can be improved significantly by minimizing variations in processing and raw material parameters.
This paper originally appeared in Thermal Spray: Meeting the Challenges of the 21st Century; Proceedings of the 15th International Thermal Spray Conference, C. Coddet, Ed., ASM International, Materials Park, OH, 1998. This proceedings paper has been extensively reviewed according
to the editorial policy of the Journal of Thermal Spray Technology. 相似文献
8.
J. Wilden J. P. Bergmann S. Jahn S. Knapp F. van Rodijnen G. Fischer 《Journal of Thermal Spray Technology》2007,16(5-6):759-767
Nowadays, wire-arc spraying of chromium steel has gained an important market share for corrosion and wear protection applications.
However, detailed studies are the basis for further process optimization. In order to optimize the process parameters and
to evaluate the effects of the spray parameters DoE-based experiments had been carried out with high-speed camera shoots.
In this article, the effects of spray current, voltage, and atomizing gas pressure on the particle jet properties, mean particle
velocity and mean particle temperature and plume width on X46Cr13 wire are presented using an online process monitoring device.
Moreover, the properties of the coatings concerning the morphology, composition and phase formation were subject of the investigations
using SEM, EDX, and XRD-analysis. These deep investigations allow a defined verification of the influence of process parameters
on spray plume and coating properties and are the basis for further process optimization.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
9.
T. Kairet M. Degrez F. Campana J.-P. Janssen 《Journal of Thermal Spray Technology》2007,16(5-6):610-618
Two copper powders were deposited with CGT3000 cold-gas dynamic spray system on aluminum substrates. Mechanical properties
have been studied using microhardness, nanoindentation, and bond strength measurements. The deposition efficiency has also
been studied. The x-ray diffraction patterns allow the characterization of the microstructure such as grain size, strain in
the coating, and dislocation densities. Both powders and coatings have been fully characterized. Three methods have been used
to interpret the x-ray patterns: the Warren-Averbach method, the Hall-Williamson (H-W) method, and the modified H-W method.
A comparison between the state of the powders before and after deposition will give an insight on the metallurgical processes
that take place during the formation of the coating. The influence of the grain size distribution will also be discussed.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
10.
Gas atomized feedstock particles of an Al-13Co-26Ce alloy system were sprayed using the Cold Spray deposition technique. The
microstructures of the coatings produced are examined and the mechanical characteristics, in particular the bending fatigue
and the bond strength, of the Al-Co-Ce coatings are reported. The results show that the Al-Co-Ce coatings improved the fatigue
behavior of AA 2024-T3 specimens when compared to uncoated and Alclad specimens. During the bond strength tests, the bonding
agent failed and no delamination of the coating from the substrate occurred. The microstructural features of the feedstock
powder were also found in the coatings. It is suggested that the increase in the fatigue properties of the specimens can be
attributed to the residual compressive stresses induced in the coatings and to the high adhesion strength of the coatings
to the substrates.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
11.
Metal-matrix composites (MMCs) containing large ceramic particles as superabrasives are typically used for grinding stone,
minerals, and concrete. Sintering and brazing are the key manufacturing technologies for grinding tool production. However,
restricted geometry flexibility and the absence of repair possibilities for damaged tool surfaces, as well as difficulties
of controlling material interfaces, are the main weaknesses of these production processes. Thermal spraying offers the possibility
to avoid these restrictions. The research for this paper investigated a fabrication method based on the use of detonation
flame spraying technology to bond large superabrasive particles (150-600 μm, needed for grinding minerals and stones) in a
metallic matrix. Layer morphology and bonding quality are evaluated with respect to superabrasive material, geometry, spraying,
and powder-injection parameters. The influence of process temperature and the possibilities of thermal treatment of MMC layers
are analyzed.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
12.
Hybrid plasma spraying combined with yttrium-aluminum-garnet laser irradiation was studied to obtain optimum zirconia coatings
for thermal barrier use. Zirconia coatings of approximately 150 μm thickness were formed on NiCrAlY bond coated steel substrates
both by means of conventional plasma spraying and hybrid plasma spraying under a variety of conditions. Post-laser irradiation
was also conducted on the plasma as-sprayed coating. The microstructure of each coating was studied and, for some representative
coatings, thermal barrier properties were evaluated by hot erosion and hot oxidation tests. With hybrid spraying, performed
under optimum conditions, it was found that a microstructure with appropriate partial densification and without connected
porosity was formed and that cracks, which are generally produced in the post-laser irradiation treatment, were completely
inhibited. In addition, hybrid spraying formed a smooth coating surface. These microstructural changes resulted in improved
coating properties with regard to hardness, high temperature erosion resistance, and oxidation resistance.
This paper originally appeared in Thermal Spray: Meeting the Challenges of the 21st Century; Proceedings of the 15th International Thermal Spray Conference, C. Coddet, Ed., ASM International, Materials Park, OH, 1998. This proceedings paper has been extensively reviewed according
to the editorial policy of the Journal of Thermal Spray Technology. 相似文献
13.
J. Shimizu E. Ohmura Y. Kobayashi S. Kiyoshima H. Eda 《Journal of Thermal Spray Technology》2007,16(5-6):722-728
Three-dimensional molecular dynamics simulation was conducted to clarify at an atomic level the flattening process of a high-temperature
droplet impacting a substrate at high speed. The droplet and the substrate were assumed to consist of pure aluminum, and the
Morse potential was postulated between a pair of aluminum atoms. In this report, the influence of the impact parameters such
as the droplet velocity and the droplet diameter on flattening behavior were analyzed. As a result, the following representative
conclusions were obtained: (a) the flattening ratio increases in proportion to the droplet velocity and the droplet diameter;
(b) the flattening ratio for nanosized droplet can be reorganized by the same dimensionless parameters of the proper physical
properties, such as the viscosity and the surface tension, as those used in the macroscopic flattening process.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
14.
Atmospheric plasma spray (APS) was used to prepare the planar positive/electrolyte/negative (PEN) and mono-block layer built
(MOLB) type PEN solid oxide fuel cells (SOFCs). On the basis of the spraying conditions optimized previously and the self-developed
functionally graded powder feeder system, two types of PEN cells were fabricated. Then the microstructure and material composition
of the PEN cells were analyzed. The results show that graded layers formed between the electrodes and electrolyte. Moreover,
the material composition and the porosity of the graded layers vary gradually. In particular, the porosities of the resultant
anode and cathode reach 32.74 and 32.24%, respectively. Using the AC complex impedance technique, the conductivity of the
MOLB type composite electrode is tested. The electrical conductivity of the MOLB type composite electrode with the graded
layers is larger than that without the graded layers.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
15.
A. Arcondéguy A. Grimaud A. Denoirjean G. Gasgnier C. Huguet B. Pateyron G. Montavon 《Journal of Thermal Spray Technology》2007,16(5-6):978-990
Many substrates do not sustain the conventional glazing process (i.e., vitreous glazing) due to the relatively high temperature
required by this treatment (i.e., up to 1400 °C in some cases) to fuse glazes after their application on the surface to be
covered. Flame spraying could appear as a solution to circumvent this limitation and to avoid thermal decomposition of substrates.
This contribution describes some structural attributes of glaze coatings manufactured by flame spraying. It also discusses
the influence of the feedstock powder morphology and some of its physical properties on coating characteristics.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
16.
Effect of Substrate Temperature on the Formation Mechanism of Cold-Sprayed Aluminum, Zinc and Tin Coatings 总被引:4,自引:0,他引:4
When describing the cold-spray process, one of the most widely used concepts is the critical velocity. Current models predicting
critical velocities take the temperature of the sprayed particles explicitly into account, but not the surface temperature
(substrate or already deposited layers) on which the particle impacts. This surface temperature is expected to play an important
role, since the deformation process leading to particle bonding and coating formation takes place both on the particle and
the substrate side. The aim of this work is to investigate the effect of the substrate temperature on the coating formation
process. Experiments were performed using aluminum, zinc, and tin powders as coating materials. These materials have a rather
large difference in critical velocities that gives the possibility to cover a broad range of deposition velocity to critical
velocity ratio using commercial low-pressure cold-spray system. The sample surface was heated and the temperature was varied
from room temperature to a high fraction of the melting point of the coating material for all three materials. The change
in temperature of the substrate during the deposition process was measured by means of a high speed IR camera. The coating
formation was investigated as a function of (1) the measured surface temperature of the substrate during deposition, (2) the
gun transverse speed, and (3) the particle velocity. Both single particle impact samples and thick coatings were produced
and characterized. Both the particle-substrate and interparticle bonding were evaluated by scanning electron microscopy (SEM)
and confocal microscopy.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
17.
The sintering of free-standing plasma sprayed TBCs has been modeled, based on variational principles of free energy minimization
and comparisons are made with experimental results. Predictions of through-thickness shrinkage and changing pore surface area
are compared with the experimental data obtained by dilatometry and BET analysis, respectively. The sensitivity of the predictions
to initial pore architecture and material properties is assessed. The model can be used to predict the evolution of the contact
area between overlying splats. This is in turn related to the through-thickness thermal conductivity, using a previously developed
analytical model (I.O. Golosnoy, et al. J. Therm. Spray Technol., 2005, 14(2), p 205-214).
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
18.
Effect of Powder Injection Location on Ceramic Coatings Properties When Using Plasma Spray 总被引:1,自引:0,他引:1
The effect of powder injecting location of the plasma spraying on spraying properties was studied. Three different powder-injecting
methods were applied in the experiment. In the first method, the particles were axially injected into the plasma flow from
the cathode tip. In the second method, the particles were radially injected into the plasma flow just downstream of the anode
arc root inside the anode nozzle. In the third method, the particles were radially injected into the plasma jet at the nozzle
exit. The alumina particles with a mean diameter of 20 μm were used to deposit coatings. Spraying properties, such as the
deposition efficiency, the melting rate of the powder particles, and the coating quality were investigated. The results show
that the spraying with axial particle injecting can heat and melt the powder particles more effectively, produce coatings
with better quality, and have higher deposition efficiency.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献
19.
Plasma sprayed cast iron coatings containing solid lubricant graphite and h-BN structure 总被引:1,自引:0,他引:1
Water-atomized cast iron powder of Fe-2.17 at.%C-9.93at.%Si-3.75at.%Al were deposited onto an aluminum alloy substrate by
atmospheric direct current plasma spraying to improve its tribological properties. Preannealing of the cast iron powder allows
the precipitation of considerable amounts of graphite structure in the powder. However, significant reduction in graphitized
carbon in cast iron coatings is inevitable after plasma spraying in air atmosphere due to the in-flight burning and dissolution
into molten iron droplets. Hexagonal boron nitride (h-BN) powders, which have excellent lubricating properties like graphite,
were incorporated into the cast iron powder as a solid lubricant by the sintering process (1300°C) to obtain protective coatings
with a low friction coefficient. The performance of each coating was evaluated using a ring-on-disk-type wear tester under
a paraffin-based oil condition in an air atmosphere. A conventional cast iron liner, which had a flaky graphite embedded in
the pearlitic matrix, was also tested under similar conditions for comparison. Sections of worn surfaces and debris were characterized,
and the wear behavior of plasma-sprayed coatings was discussed.
The original version of this paper was published in the CD ROM Thermal Spray Connects: Explore Its Surfacing Potential, International Thermal Spray Conference, sponsored by DVS, ASM International, and HW International Institute of Welding,
Basel, Switzerland, May 2–4, 2005, DVS-Verlag GmbH, Düsseldorf, Germany. 相似文献
20.
Solution Precursor Plasma Spray of Nickel-Yittia Stabilized Zirconia Anodes for Solid Oxide Fuel Cell Application 总被引:1,自引:0,他引:1
In conventional plasma spray of SOFC components, the large NiO and YSZ particles used, about 50-150 microns for high porosity
coating, reduce the density of three-phase sites for electrode reaction. In this article, the SPPS process was used to synthesize
and deposit Ni-YSZ anodes. The results show that several process parameters have significant effects on the microstructure
and phase composition of the deposited material. The deposits were composed of tower-like, irregularly shaped agglomerates
and smooth surface deposits. The sizes of the agglomerates increase with the decrease of the plasma-torch power and most are
not completely molten during the impact. After heat treatment to reduce the NiO present in the as deposited coatings, the
coatings were found to contain spherical YSZ particles about 0.5 μm in diameter distributed in a continuous Ni matrix, which
is verified by both SEM observation and electrical resistance measurement. The coatings have 30-50% porosity.
This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been
expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 14-16, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain
Montavon, Ed., ASM International, Materials Park, OH, 2007. 相似文献