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1.
Vasyl Pokhmurskii Hrygorij Nykyforchyn Mykhajlo Student Mykhajlo Klapkiv Hanna Pokhmurska Bernhard Wielage Thomas Grund Andreas Wank 《Journal of Thermal Spray Technology》2007,16(5-6):998-1004
Different posttreatment methods, such as heat treatment, mechanical processing, sealing, etc., are known to be capable to
improve microstructure and exploitation properties of thermal spray coatings. In this work, a plasma electrolytic oxidation
of aluminum coatings obtained by arc spraying on aluminum and carbon steel substrates is carried out. Microstructure and properties
of oxidized layers formed on sprayed coating as well as on bulk material are investigated. Oxidation is performed in electrolyte
containing KOH and liquid glass under different process parameters. It is shown that thick uniform oxidized layers can be
formed on arc-sprayed aluminum coatings as well as on solid material. Distribution of alloying elements and phase composition
of obtained layers are investigated. A significant improvement of wear resistance of treated layers in two types of abrasive
wear conditions is observed.
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.
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
4.
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
5.
In this article, we proposed a rapid and continuous process for the production of nanoporous coatings for functional applications.
Experiments following two statistical designs were implemented to screen and investigate the spraying parameters’ effects
on coating crystallinity and porosity in order to gain a better understanding. The spraying standoff distance, solution flow
rate and power were identified as having significant effects on coating porosity and crystallinity. The result yielded a peculiar
microstructure comprised of interpenetrating pores and layered structures with embedded pores. A deposition mechanism was
postulated to explain this microstructure. Ethanol gas sensors that are constructed from the coatings had comparable sensitivities
to those reported in the literature for thick-film coatings and had a maximum sensitivity near 200 °C.
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
6.
C. Marchand C. Chazelas G. Mariaux A. Vardelle 《Journal of Thermal Spray Technology》2007,16(5-6):705-712
Plasma spraying using liquid feedstock makes it possible to produce thin coatings (<100 μm) with more refined microstructures
than in conventional plasma spraying. However, the low density of the feedstock droplets makes them very sensitive to the
instantaneous characteristics of the fluctuating plasma jet at the location where they are injected. In this study, the interactions
between the fluctuating plasma jet and droplets are explored by using numerical simulations. The computations are based on
a three-dimensional and time-dependent model of the plasma jet that couples the dynamic behaviour of the arc inside the torch
and the plasma jet issuing from the plasma torch. The turbulence that develops in the jet flow issuing in air is modeled by
a large Eddy simulation model that computes the largest structures of the flow which carry most of the energy and momentum.
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. 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
8.
Hong-Tao Wang Chang-Jiu Li Guan-Jun Yang Cheng-Xin Li Qiang Zhang Wen-Ya Li 《Journal of Thermal Spray Technology》2007,16(5-6):669-676
It is difficult to deposit dense intermetallic compound coatings by cold spraying directly using the compound feedstock powders
due to their intrinsic low-temperature brittleness. A method to prepare intermetallic compound coatings in-situ employing
cold spraying was developed using a metastable alloy powder assisted with post-heat treatment. In this study, a nanostructured
Fe/Al alloy powder was prepared by ball-milling process. The cold-sprayed Fe/Al alloy coating was evolved in-situ to intermetallic
compound coating through a post-heat treatment. The microstructural evolution of the Fe-40Al powder during mechanical alloying
and the effect of the post-heat treatment on the microstructure of the cold-sprayed Fe(Al) coating were characterized by optical
microscopy, scanning electron microscopy, transmission electron microscopy (TEM), and x-ray diffraction analysis. The results
showed that the milled Fe-40Al powder exhibits lamellar microstructure. The microstructure of the as-sprayed Fe(Al) coating
depends significantly on that of the as-milled powder. The heat-treatment temperature significantly influences the in-situ
evolution of the intermetallic compound. The heat treatment at a temperature of 500 °C results in the complete transformation
of Fe(Al) solid solution to FeAl intermetallic compound.
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.
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
10.
Chang-Jiu Li Guan-Jun Yang Pei-Hu Gao Jian Ma Yu-Yue Wang Cheng-Xin Li 《Journal of Thermal Spray Technology》2007,16(5-6):1011-1020
Nanostructured WC-Co coating was deposited by cold spraying using a nanostructured WC-12Co powder. The critical velocity for
the particle to deposit was measured. The coating microstructure was characterized by X-ray diffraction analysis, scanning
electron microscopy, and transmission electron microscopy. The coating hardness was tested using a Vickers hardness tester.
The deposition behavior of single WC-Co particle was examined. WC particle size was measured for comparison of deposit properties
to that of sintered bulk. The result shows that the nanostructured WC-Co coating can be successfully deposited by cold spraying
using nanostructured powders. The coating exhibited a dense microstructure with full retention of the original nanostructure
in the powder to the coating. The test of microhardness of the coating yielded a value of over 1820 Hv0.3, which is comparable to that of sintered nanostructured WC-Co. The deposition behavior of WC-Co powders as superhard cermet
materials in cold spraying and powder structure effects is 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
11.
H.B. Parizi L. Rosenzweig J. Mostaghimi S. Chandra T. Coyle H. Salimi L. Pershin A. McDonald C. Moreau 《Journal of Thermal Spray Technology》2007,16(5-6):713-721
This work presents numerical simulation results for molten nickel and zirconia (YZS) droplets impacting on different microscale-patterned
surfaces of silicon. The numerical simulation clearly showed the effect of surface roughness and solidification on the shape
of the final splat, as well as the pore creation beneath the sprayed material. Simulations were performed using computational
fluid dynamic software, SimDrop. The code uses a three-dimensional finite-difference algorithm solving the full Navier-Stokes
equation, including heat transfer and phase change. A volume of fluid (VOF) tracking algorithm is used to track the droplet-free
surface. Thermal contact resistance at the droplet-substrate interface is also included in the model. Specific attention is
paid to the simulation of droplet impact under plasma spraying conditions. Droplet sizes ranged from 15 to 60 microns with
initial velocities of 70-250 m/s. Substrate surfaces were patterned with regular arrays of cubes 1-3 μm high, spaced either
1 μm or 5 μm from each other. Different splat morphologies produced by simulations are compared with those obtained from the
experiment conducted under the same impact and surface conditions.
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.
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
13.
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
14.
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
15.
Nanocrystalline Al−Mg coatings were produced using the cold gas dynamic-spraying technique. Unsieved Al−Mg powder of average
nanocrystalline grain size in the range of 10 to 30 nm and with a particle size distribution from 10 to >100 μm was used as
the feedstock powder. The resulting coatings were evaluated using scanning electron microscopy (SEM), transmission electron
microscopy, as well as microhardness and nanoindentation measurements. Coating observations suggest that the wide particle
size distribution of the feedstock powder has a detrimental effect on the coating quality but that it can be successfully
mitigated by optimizing the spraying parameters. Nanohardness values close to 3.6 GPa were observed in both the feedstock
powder and coatings, suggesting the absence of cold-working hardening effects during the process. The effects of the substrate
surface roughness and thickness on coating quality were investigated. The deposited mass measurements performed on the coatings
showed that the effect of using different grit sizes for the substrate preparation is limited to small changes in the deposition
efficiency of only the first few layers of deposited material. The SEM observation showed that the substrate surface roughness
has no significant effect on the macrostructures and microstructures of the coating. The ability to use the cold gas dynamic
spraying process to produce coatings on thin parts without noticeable substrate damage and with the same quality as coatings
produced on thicker substrates was demonstrated in this work.
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 IIW International Institute of Welding,
Basel, Switzerland, May 2–4, 2005, DVS-Verlag GmbH, Düsseldorf, Germany. 相似文献
16.
Corrosion Behavior of Arc Sprayed Nickel-Base Coatings 总被引:1,自引:0,他引:1
In this study, nickel-base cored wires were prepared by using NiCr strip to wrap metal powders of nickel (Ni), chromium (Cr),
molybdenum (Mo), and chromium boron (CrB). Nickel-base coatings were prepared by electric arc spraying. Microstructures of
Ni-Cr-Mo and Ni-Cr-B coatings were investigated using scanning electron microscopy (SEM), energy-dispersive analysis (EDAX),
and x-ray diffraction (XRD) analysis. The coatings have a compact surface and presented a bonding strength higher than 40 MPa.
Potentiodynamic polarization measurements and salt-spray test were carried out to determine the corrosion behavior of the
coatings. The results showed that Ni-base coatings containing Mo (5%) or B (2-4%) had better antichlorine ion corrosion performance
than that of Ni-base coatings without Mo element, and PS45 (Ni-Cr-Ti) coating. The antichlorine ion corrosion coatings could
be used for resolving the corrosion protection problem of the equipment and piping contacting sour, alkali, salt liquid in
petrochemical engineering applications.
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.
A three-dimensional model of a Cold Gas Dynamic Spray system with a peripheral nonaxisymmetric powder feeder is studied in
this work. It is found that the stagnation pressure alternates for different substrate standoff distances due to the nature
of the supersonic flow interaction with the substrate. One can find the optimum substrate location for any given operating
condition, which results in minimum pressure buildup on the substrate. The three-dimensional analysis sheds more light on
the complex gas and particle flow fields generated due to the three-dimensional particle injection process. In addition, the
three-dimensional model allows us to further investigate the effect of practical substrate shapes (such as convex and concave)
on the flow field and consequently to determine the optimum conditions to deposit coating particles.
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.
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
19.
Finely structured ceramic coatings can be obtained by solution precursor plasma spraying. The final structure of the coating
highly depends on the droplet size and velocity distribution at the injection, the evolution of the spray in the jet, and
droplet breakup and collision within the spray. This article describes a 3D model to simulate the transport phenomena and
the trajectory and heating of the solution spray in the process. O’Rourke’s droplet collision model is used to take into account
the influence of droplet collision. The influence of droplet breakup is also considered by implementing TAB droplet breakup
models into the plasma jet model. The effects of droplet collisions and breakup on the droplet size, velocity, and temperature
distribution of the solution spray are investigated. The results indicate that droplet breakup and collision play an important
role in determining the final particle size and velocity distributions on the substrate.
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
20.
Yanguang Shan Thomas W. Coyle Javad Mostaghimi 《Journal of Thermal Spray Technology》2007,16(5-6):736-743
Solution precursor plasma spraying has been used to produce finely structured ceramic coatings with nano- and sub-micrometric
features. This process involves the injection of a solution spray of ceramic salts into a DC plasma jet under atmospheric
condition. During the process, the solvent vaporizes as the droplet travel downstream. Solid particles are finally formed
due to the precipitation of the solute, and the particle are heated up and accelerated to the substrate to generate the coating.
This article describes a 3D model to simulate the transport phenomena and the trajectory and heating of the solution spray
in the process. The jet-spray two-way interactions are considered. A simplified model is employed to simulate the evolution
process and the formation of the solid particle from the solution droplet in the plasma jet. The temperature and velocity
fields of the jet are obtained and validated. The particle size, velocity, temperature, and position distribution on the substrate
are predicted.
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