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1.
Nanostructured titania (TiO2) coatings were produced by high-velocity oxyfuel (HVOF) spraying. They were engineered as a possible candidate to replace
hydroxyapatite (HA) coatings produced by thermal spray on implants. The HVOF sprayed nanostructured titania coatings exhibited
mechanical properties, such as hardness and bond strength, much superior to those of HA thermal spray coatings. In addition
to these characteristics, the surface of the nanostructured coatings exhibited regions with nanotextured features originating
from the semimolten nanostructured feedstock particles. It is hypothesized that these regions may enhance osteoblast adhesion
on the coating by creating a better interaction with adhesion proteins, such as fibronectin, which exhibit dimensions in the
order of nanometers. Preliminary osteoblast cell culture demonstrated that this type of HVOF sprayed nanostructured titania
coating supported osteoblast cell growth and did not negatively affect cell viability.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
2.
B. G. Ravi S. Sampath R. Gambino J. B. Parise P. S. Devi 《Journal of Thermal Spray Technology》2006,15(4):701-707
Precursor plasma spray synthesis is an innovative and rapid method for making functional oxide ceramic coatings by starting
from solution precursors and directly producing inorganic films. This emerging method utilizes molecularly mixed precursor
liquids, which essentially avoids the handling and selection of powders, opening up new avenues for developing compositionally
complex functional oxide coatings. Precursor plasma spray also offers excellent opportunities for exploring the nonequilibrium
phase evolution during plasma spraying of multicomponent oxides from inorganic precursors. Although there have been efforts
in this area since the 1980s and early 1990s with the goal of synthesizing nanoparticles, only recently has the work progressed
in the area of functional systems. At the Center for Thermal Spray Research an integrated investigative strategy has been
used to explore the benefits and limits of this synthesis strategy. Water- and alcohol-based sol/solution precursors derived
from various chemical synthesis methods were used as feedstocks to deposit thin/thick films of spherical and nanostructured
coatings of yttrium aluminum garnet (YAG), yttrium iron garnet, lanthanum strontium manganate and Zr-substituted yttrium titanates,
and compositions of Y2O3-Al2O3 and their microstructural space centered around stoichiometric YAG. A detailed discussion of the salient features of the
radiofrequency induction plasma spraying approach, the results obtained in the investigations to develop various functional
oxide coatings, and process issues and challenges are presented.
This article was originally published inBuilding on 100 Years of Success: Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
3.
Ajdelsztajn L. Tang F. Schoenung J. M. Kim G. E. Provenzano V. 《Journal of Thermal Spray Technology》2005,14(1):23-30
Thermal barrier coating systems protect turbine blades against high-temperature corrosion and oxidation. They consist of a
metal bond coat (MCrAlY, M = Ni, Co) and a ceramic top layer (ZrO2/Y2O3). In this work, the oxidation behavior of conventional and nanostructured high-velocity oxyfuel (HVOF) NiCrAlY coatings has
been compared. Commercially available NiCrAlY powder was mechanically cryomilled and HVOF sprayed on a nickel alloy foil to
form a nanocrystalline coating. Freestanding bodies of conventional and nanostructured HVOF NiCrAlY coatings were oxidized
at 1000 °C for different time periods to form the thermally grown oxide layer. The experiments show an improvement in oxidation
resistance in the nanostructured coating when compared with that of the conventional one. The observed behavior is a result
of the formation of a continuous Al2O3 layer on the surface of the nanostructured HVOF NiCrAlY coating. This layer protects the coating from further oxidation and
avoids the formation of mixed oxide protrusions present in the conventional coating.
The original version of this article was published as part of the ASM Proceedings, Thermal Spray 2003: Advancing the Science and Applying the Technology, International Thermal Spray Conference (Orlando, FL), May 5–8 2003, Basil R. Marple and Christian Moreau, Ed., ASM International,
2003. 相似文献
4.
A new type of thermal barrier coating (TBC) based on metal-glass composite (MGC) consisting of an ordinary container glass
and a NiCoCrAlY-alloy has been recently presented. This TBC material provides the possibility to easily adjust its thermal
expansion coefficient to match the substrate by changing the metal to glass ratio of the composite. Vacuum plasma spraying
(VPS) has been applied as a possible technologies for deposition of MGC coatings. Isothermal oxidation tests were carried
out in air at temperatures of 950, 1000, and 1050 °C, respectively. Thermal cycling tests were carried out by applying a temperature
gradient across the sample thickness by heating with an open flame of natural gas followed by removal of the burner and air
cooling. Changes in the microstructure were examined by means of microscopy, microanalysis, and x-ray powder diffraction.
For long-time annealing at high temperatures, a progressive degradation of the glass matrix as well as oxidation of the metal
phases cannot be fully suppressed up to now. By lowering the effective temperature at the MGC layer when used as an intermediate
layer, the degradation of the MGC can be reduced without losing its advanced features with respect to creeping and gas-tightness.
Additional concepts for improved oxidation resistance of the MGC based on suitable heat treatments and on alternative glass
compositions have been developed, and primary results are shown. Evaluation of results from isothermal oxidation experiments
and from thermal cycling in burner-rig facilities validates a clear improvement of the lifetime of the coatings compared with
earlier results.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
5.
Nanostructured WC-12% Co coatings were deposited by suspension plasma spraying of submicron feedstock powders, using an internal
injection plasma torch. The liquid carrier used in this approach allows for controlled injection of much finer particles than
in conventional thermal spraying, leading to thin coatings with a fine surface finish. A polyethylene-imine (PEI) dispersant
was used to stabilize the colloidal suspension in an ethanol carrier. In-flight particle states were measured for a number
of operating conditions of varying plasma gas flow rates, feed rates, and standoff distances and were related to the resulting
microstructure, phase composition (EDS, SEM, XRD), and Vickers hardness. High in-flight particle velocities (>800 m/s) were
generated, leading to dense coatings. It was observed that the coating quality was generally compromised by the high temperature
and reactivity of the small particles. To compensate for this shortcoming, the suspension feed rate was adjusted, thereby
varying the thermal load on the plasma. Results showed that a slightly larger agglomerate size, in conjunction with low particle
jet temperatures, could somewhat limit the decomposition of WC into brittle W2C/W3C and amorphous cobalt containing binder phases.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
6.
Cold gas dynamic spraying of iron-base amorphous alloy 总被引:2,自引:0,他引:2
L. Ajdelsztajn E. J. Lavernia B. Jodoin P. Richer E. Sansoucy 《Journal of Thermal Spray Technology》2006,15(4):495-500
This paper describes recent efforts to synthesize iron-base amorphous alloys coatings using cold gas dynamic spraying. Characterization
of the gas-atomized iron-base (Fe-Cr-Mo-W-C-Mn-Si-Zr-B) powder shows that the powder is fully amorphous when the particle
diameter is below 20 μm. The coatings produced were composed of the same microstructure as the one observed in the feedstock
powder. The overall deformation suggests the occurrence of a localized deformation process at the particle/particle boundary
and a possible adiabatic deformation softening inside the powder particles during splat formation. The synthesis of fully
amorphous, porous-free coatings using cold gas dynamic spraying was demonstrated in this work.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
7.
S. Q. Fan G. J. Yang C. J. Li G. J. Liu C. X. Li L. Z. Zhang 《Journal of Thermal Spray Technology》2006,15(4):513-517
Control of the microstructure of TiO2 coatings through preparation methods significantly influences the coating performance. In this study, a vacuum cold-spray
process, as a new coating technology, is used to deposit nanocrystalline TiO2 coatings on conducting glass and stainless steel substrates. TiO2 deposits were formed using two types of nanocrystalline TiO2 powders with mean particle diameters of 200 and 25 nm. Coating microstructures were characterized by scanning electron microscopy
and x-ray diffraction analysis. Results demonstrate that a thick nanocrystalline TiO2 coating can be deposited by the vacuum cold-spray process. The coating was found to consist of particles stacked as agglomerates
that build up to several hundred nanometers. The coating also presents a mesoporous microstructure that could be effective
in such applications as photocatalytic degradation and dye-sensitized solar cells.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
8.
Aside from its importance as a design parameter for thermal barrier coatings, measuring thermal conductivity of thermal sprayed
coatings itself provides a unique method to critically characterize the nature, quantity, and anisotropy of the defect morphologies
in these splat-based coatings. In this paper, the authors present a systematic assessment of thermal conductivity of wide
range using the flash diffusivity technique. For the case of plasma sprayed yttria-stabilized zirconia (YSZ), coatings obtained
from wide-ranging initial powder morphologies as well as those fabricated under different particle states were characterized.
Both in-plane and through-thickness properties were obtained. Other material systems that were considered include: metallic
alloys and semiconductors of interests. Issues such as reproducibility and reliability in measurements were also considered
and assessed. Finally, work in collaboration with the Oak Ridge National Laboratory (ORNL) for alternate approaches to characterization
of thermal conductivity as well as high-temperature measurements was performed.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
9.
Mathematical models for simulation of motion and heating of fine ceramic particles in plasma and laser spraying, as well as
under conditions of a new technological process, that is, hybrid laser plasma spraying, are proposed. Trajectories, velocities,
and temperature fields of fine SiO2 particles being sprayed using the argon plasma jet, CO2 laser beam, and their combination have been calculated. It is shown that the space-time distribution of temperature in spray
particles greatly depends on the spraying method.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
10.
T. Van Steenkiste 《Journal of Thermal Spray Technology》2006,15(4):501-506
One unique advantage of the kinetic spray process is its ability to mix constituents that would normally react with each other
to form coatings. This attribute was used to produce composite coatings with different rare earth iron alloys (REFe2) and several ductile matrices. Composite coatings of Terfenol-D [(Tb0.3Dy0.7)Fe1.9] and SmFe2 were combined with ductile matrices of aluminum, copper, iron, and molybdenum. Evidence of an induced magnetic coercivity
was measured for the REFe2-Mo and Fe composite coatings. Coatings were produced on flat substrates and shafts. Coating morphology as well as the physical,
magnetostrictive, and magnetic properties of these coatings are discussed.
This article was originally published inBuilding on 100 Years of Success: Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
11.
A. Nadeau L. Pouliot F. Nadeau J. Blain S. A. Berube C. Moreau M. Lamontagne 《Journal of Thermal Spray Technology》2006,15(4):744-749
In the past 10 years, significant progress has been made in the field of advanced sensors for particle and spray plume characterization.
However, there are very few commercially available technologies for the online characterization of the as-deposited coatings.
In particular, coating thickness is one of the most important parameters to monitor and control. Current methods such as destructive
tests or direct mechanical measurements can cause significant production downtime. This article presents a novel approach
that enables online, real-time, and noncontact measurement of individual spray pass thickness during deposition. Micron-level
resolution was achieved on various coatings and substrate materials. The precision has been shown to be independent of surface
roughness or thermal expansion. Results obtained on typical high-velocity oxyfuel and plasma-sprayed coatings are presented.
Finally, current fields of application, technical limitations, and future developments are discussed.
This article was originally published inBuilding on 100 Years of Success: Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
12.
In the current study, Cr3C2-NiCr coating was deposited on the Ni-base superalloys by using high velocity oxyfuel (HVOF) process for high temperature
corrosive environment applications. Optical microscopy (OM), x-ray diffraction (XRD), scanning electron microscopy/energy-dispersive
analysis (SEM/EDAX), microhardness tester, and electro probe microanalyzer (EMPA) techniques were used to characterize the
coating with regard to coating thickness, porosity, microhardness, and microstructure. The thermogravimetric technique was
used to establish kinetics of corrosion. The hot corrosion behaviors of the bare and Cr3C2-NiCr coated superalloys were studied after exposure to aggressive environment of Na2SO4-60% V2O5 salt mixture at 900 °C under cyclic conditions. The structure of the as-sprayed Cr3C2-NiCr coating mainly consisted of γ-nickel solid solution along with minor phases of Cr7C3 and Cr2O3. Coating has porosity less than 1.5% and microhardness in the range of 850–900 Hv (Vickers hardness). Some inclusions, unmelted
and semimelted powder particles were observed in the structure of the coatings. The Cr3C2-NiCr coating has imparted necessary resistance to hot corrosion, which has been attributed to the formation of oxides of
nickel and chromium, and spinel of nickel-chromium.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
13.
To achieve solid oxide fuel cells (SOFC) at reduced costs, the atmospheric plasma spray (APS) process could be an attractive
technique. However, to make dense and thin layers as needed for electrolytes, a suspension is preferably implemented as a
feedstock material instead of a conventional powder. Suspensions of yttria-stabilized zirconia particles in methanol have
been prepared with various solid loadings and states of dispersion. An external injection system was used to ensure the atomization
and radial injection of the suspension into the Ar-H2 plasma under atmospheric conditions. The coatings morphologies were characterized by scanning electron microscopy, and their
porosity was evaluated by the Archimedes method. Differences in the microstructure of the deposits were observed depending
on the APS operating conditions. Special attention has been dedicated to assess the influence of the suspension as well as
the injection on the layer morphology. For this purpose, the atomization has been investigated and efforts have been made
to understand relationships among suspension properties, atomization, and coating microstructure.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
14.
J. Hafiz R. Mukherjee X. Wang P. H. McMurry J. V. R. Heberlein S. L. Girshick 《Journal of Thermal Spray Technology》2006,15(4):822-826
In the hypersonic plasma particle deposition process, vapor phase reactants are injected into a plasma and rapidly quenched
in a supersonic nozzle, leading to nucleation of nanosize particles. These particles impact a substrate at high velocity,
forming a coating with grain sizes of 10 to 40 nm. As previously reported, coatings of a variety of materials have been obtained,
including silicon, silicon carbide, titanium carbide and nitride, and composites of these, all deposited at very high rates.
Recent studies have shown that slight modifications of the process can result in nanosize structures consisting of single
crystal silicon nanowires covered with nanoparticles. These nanowires are believed to grow in a vapor deposition process,
catalyzed by the presence of titanium in the underlying nanoparticle film. However, simultaneously nanoparticles are nucleated
in the nozzle and deposited on the nanowires, leading to structures that are the result of a plasma chemical vapor deposition
(CVD) process combined with a nanoparticle spray process. The combination of these two process paths opens new dimensions
in the nanophase materials processing area.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
15.
J. G. Legoux F. Chellat R. S. Lima B. R. Marple M. N. Bureau H. Shen G. A. Candeliere 《Journal of Thermal Spray Technology》2006,15(4):628-633
The aging baby boomer population coupled with an increase in life expectancy is leading to a rising number of active elderly
persons in occidental countries. As a result, the orthopedic implant industry is facing numerous challenges such as the need
to extend implant life, reduce the incidence of revision surgery, and improve implant performance. This paper reports results
of an investigation on the bioperformance of newly developed coating-substrate systems. Hydroxyapatite (HA) and nano-titania
(nano-TiO2) coatings were produced on Ti-6Al-4V and fiber reinforced polymer composite substrates. In vitro studies were conducted to
determine the capacity of bioactive coatings developed to sustain osteoblast cells (fetal rat calvaria) adherence, growth,
and differentiation.
As revealed by scanning electron microscopy (SEM) observations and alkaline phosphatase activity, cell adhesion and proliferation
demonstrated that HA coatings over a polymer composite are at least as good as HA coatings made over Ti-6Al-4V substrate in
terms of osteoblast cell activity. Nano-TiO2 coatings produced by high-velocity oxyfuel (HVOF) spraying led to different results. For short-term cell culture (4.5 and
24 h), the osteoblasts appeared more flattened when grown on nano-TiO2 than on HA. The surface cell coverage after seven days of incubation was also more complete on nano-TiO2 than HA. Preliminary results indicate that osteoblast activity after 15 days of incubation on nano-TiO2 is equivalent to or greater than that observed on HA.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
16.
Effect of Cu2+ doping on photocatalytic performance of liquid flame sprayed TiO2 coatings 总被引:2,自引:0,他引:2
Guan-Jun Yang Chang-Jiu Li Cheng-Xin Li Yu-Yue Wang Xin-Chun Huang 《Journal of Thermal Spray Technology》2006,15(4):582-586
Cu2+ was added to liquid feedstock to deposit ion doping TiO2 photocatalytic coatings through liquid flame spraying. The coating microstructure was characterized by x-ray diffraction
(XRD), transmission electron microscopy, and x-ray photoelectron spectroscopy (XPS). The photocatalytic performance of coatings
was examined by photodegradation of acetaldehyde. The XRD analysis shows that the crystalline structure of coatings is not
significantly influenced by Cu2+ doping. The photocatalytic activity of the TiO2 coatings is enhanced by Cu2+ doping. It is found that a high concentration of Cu2+ doping decreases the activity. The XPS analysis shows that the adsorbed oxygen concentration is increased with the increase
of Cu2+ dopant concentration and decreases with a further increase of dopant concentration. The enhancement of photocatalytic activity
can be attributed to the adsorption ability of oxygen and other reactants on the surface of doping TiO2 coatings.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
17.
Comparison of the photocatalytic behavior of TiO2 coatings elaborated by different thermal spraying processes 总被引:2,自引:0,他引:2
Filofteia-Laura Toma Dmitry Sokolov Ghislaine Bertrand Didier Klein Christian Coddet Cathy Meunier 《Journal of Thermal Spray Technology》2006,15(4):576-581
This paper proposes a comparative study on the microstructure and photocatalytic performances of titanium dioxide coatings
elaborated by various thermal spraying methods (plasma spraying in atmospheric conditions, suspension plasma spraying, and
high-velocity oxyfuel spraying). Agglomerated spray dried anatase TiO2 powder was used as feedstock material for spraying. Morphology and microstructural characteristics of the coatings were studied
mainly by scanning electron microscopy and x-ray diffraction. The photocatalytic behavior of the TiO2-base surfaces was evaluated from the conversion rate of gaseous nitrogen oxides (NOx). It was found that the crystalline
structure depended strongly on the technique of thermal spraying deposition. Moreover, a high amount of anatase was suitable
for the photocatalytic degradation of the pollutants. Suspension plasma spraying has allowed retention of the original anatase
phase and for very reactive TiO2 surfaces to be obtained for the removal of nitrogen oxides.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
18.
Optimization of laser cladding process using taguchi and EM methods for MMC coating production 总被引:1,自引:0,他引:1
This study investigates the influence of laser cladding parameters on the geometry and composition of metalmatrix composite
(MMC) coatings. Composite coatings are made of a Ni-Cr-B-Si metallic matrix and of WC reinforcement with a volume fraction
of 50%. Optical microscopy is used to characterize the coating geometry (height, width, and penetration depth) and to determine
the real volumetric content of WC. Laser cladding on low-carbon steel substrate is carried out using a cw neodymium:yttrium-aluminum-garnet
(Nd:YAG) laser, a coaxial powder injection system, and a combination of Taguchi and EM methods to design the experiments.
This combination explores efficiently the multidimensional volume of laser cladding parameters. The results, which express
the interrelationship between laser cladding parameters and the characteristics of the clad produced, can be used to find
optimum laser parameters, to predict the responses, and to improve the understanding of laser cladding process.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
19.
The process parameters of atmospheric plasma spraying (APS) influence the coating formation and properties of partially yttria
stabilized zirconia (PYSZ) thermal barrier coatings (TBC). Simulations can be used to investigate this dependency and to design
the coating process for a targeted production of TBCs. A whole process simulation was realized by modeling the linked subprocesses:
plasma torch, plasma free jet, powder particles characteristics, and coating formation. The coating formation can be described
by model approaches with different physical assumptions and geometric scales. One approach is the simulation of single powder
particles hitting the substrate surface. An alternative macroscale finite element model (FEM) model approach is applied in
the coating formation simulation. A group of particles is pooled in a splash that is dependent on the precalculated particle
distribution in front of the substrate. A third modeling approach is applied to calculate effective mechanical and thermodynamical
properties of coatings dependent on the experimentally obtained or calculated microstructure of the PYSZ TBC, which is based
on different homogenization methods. The application of three simulation approaches in the whole process simulation of APS
is discussed; advantages and disadvantages are elucidated. Results based on simulation and experiments are presented for a
variation of process parameters. Missing links in the multiscale approach are detected to make suggestions for future modeling
and simulation work.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献
20.
The application of thick high-velocity oxyfuel (HVOF) coatings on metallic parts has been widely accepted as a solution to
improve their wear properties. The adherence of these coatings to the substrate is strongly influenced by the residual stresses
generated during the coating deposition process. In an HVOF spraying process, due to the relatively low processing temperature,
significant peening stresses are generated during impact of molten and semimolten particles on the substrate. At present,
finite-element (FE) models of residual stress generation for the HVOF process are not available due to the increased complexities
in modeling the stresses generated due to the particle impact. In this work, an explicit FE analysis is carried out to study
the effect of molten particle impingement using deposition of an HVOF sprayed copper coating on a copper substrate as an example
system. The results from the analysis are subsequently used in a thermomechanical FE model to allow the development of the
residual stresses in these coatings to be modeled.
This article was originally published inBuilding on 100 Years of Success, Proceedings of the 2006 International Thermal Spray Conference (Seattle, WA), May 15–18, 2006, B.R. Marple, M.M. Hyland, Y.-Ch. Lau, R.S. Lima, and J. Voyer, Ed., ASM International, Materials
Park, OH, 2006. 相似文献