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1.
Chao Zhang Wen-Ya Li Hanlin Liao Chang-Jiu Li Cheng-Xin Li Christian Coddet 《Journal of Thermal Spray Technology》2007,16(5-6):1005-1010
Yttria stabilized zirconia and lanthanum strontium manganate (YSZ/LSM) have been employed to fabricate the composite cathode
layer for solid oxide fuel cells (SOFCs). In the present study, the YSZ/LSM composite coating was deposited by atmospheric
plasma spray (APS) using the mechanical blending LSM and YSZ with ratios of 50:50, 40:60, and 20:80 wt.%. The electrical conductivity
of the composite coating was measured by the means of direct current (DC) measurement in the temperature range of 500-900 °C.
The electrical conductivity of the YSZ-50%LSM coating ranged from 2.17 to 3.60 S/cm along the direction parallel to the coating
surface at the temperature range. For the same specimen, the electrical conductivity perpendicular to the plane is less than
one-tenth of that in the plane. The anisotropy of the electrical conductivity is attributed to the phases of different properties
in the composite coating and the APS coating structure characteristics. The results also showed that the electrical conduction
of the composite was strongly influenced by the YSZ content.
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.
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
3.
Microstructure evolution of cold-sprayed coating during deposition and through post-spraying heat treatment 总被引:2,自引:1,他引:2
The microstructural features of cold-sprayed coatings were investigated using Cu, Ti and Zn feedstocks by optical microscopy, scanning electron microscopy and transmission electron microscopy to reveal the microstructure evolution mechanisms in cold spray. Four typical effects including tamping, refinement, impact-induced fusion and annealing were examined on microstrueture. It is found that the microstructure of cold spray coating is remarkably influenced by spray materials. Ti coatings consist of evident porous layer and Cu coatings present a limited porous layer only near the surface. It is clear that the successive tamping effect and dynamic refinement of grains significantly influence the microstructure evolution of cold-sprayed coating. The tamping effect leads to the densification of porous coating layer gradually and the refinement effect leads to the formation of fine microstructure. It is considered that the large difference in the formation of porous layer is attributed to the dynamic impact pressure and hardenability of materials. It is also found that the impact-induced fusion during deposition of Zn coating can also modify the interfacial microstructure between particles in cold spray coating. Moreover, the nanocrystalline phase can be formed at the interfaces among particles resulting from the localized melting of the interfaces and tamping effect. Furthermore, the annealing treatment can modify the microstructure and property of a cold-sprayed coating. 相似文献
4.
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
5.
A. C. Hall D. J. Cook R. A. Neiser T. J. Roemer D. A. Hirschfeld 《Journal of Thermal Spray Technology》2006,15(2):233-238
Cold spray, a new member of the thermal spray process family, can be used to prepare dense, thick metal coatings. It has tremendous
potential as a spray-forming process. However, it is well known that significant cold work occurs during the cold spray deposition
process. This cold work results in hard coatings but relatively brittle bulk deposits. This work investigates the mechanical
properties of cold-sprayed aluminum and the effect of annealing on those properties. Cold spray coatings approximately 1 cm
thick were prepared using three different feedstock powders: Valimet H-10: Valimet H-20: and Brodmann Flomaster. ASTM E8 tensile
specimens were machined from these coatings and tested using standard tensile testing procedures. Each material was tested
in two conditions: as-sprayed; and after a 300°C, 22h air anneal. The as-sprayed material showed high ultimate strength and
low ductility, with <1% elongation. The annealed samples showed a reduction in ultimate strength but a dramatic increase in
ductility, with up to 10% elongation. The annealed samples exhibited mechanical properties that were similar to those of wrought
1100 H14 aluminum. Microstructural examination and fractography clearly showed a change in fracture mechanism between the
as-sprayed and annealed materials. These results indicate good potential for cold spray as a bulkforming process.
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
6.
Influence of Annealing on Photocatalytic Performance and Adhesion of Vacuum Cold-Sprayed Nanostructured TiO2 Coating 总被引:1,自引:0,他引:1
Guan-Jun Yang Chang-Jiu Li Sheng-Qiang Fan Yu-Yue Wang Cheng-Xin Li 《Journal of Thermal Spray Technology》2007,16(5-6):873-880
Composite powder was prepared using primary nanoTiO2 powder and polyethylene glycol (PEG). The nanoTiO2 coating was deposited through vacuum cold spray using both the composite powder and the primary nanopowder. The influence
of annealing on the coating adhesion and photocatalytic activity was investigated. The coating adhesion was evaluated through
erosion test by water jet. The photocatalytic performance of the coatings was evaluated through photodegradation of phenol
in water. Results showed that annealing of the coating at a temperature from 450 to 500 °C yielded both higher activity and
better adhesion. The adhesion of the coating deposited using the composite powder was better than that using the primary nanoTiO2 powder. It was found that the TiO2 coating, resulting from the composite powder, presented much higher activity than that deposited with the primary nanopowder.
The better activity is attributed to the existence of large pores resulting from the stacking of composite powder, which benefits
the reactants’ transportation through the porous 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
7.
The interfacial microstructure and resistivity of cold-drawn and annealed thin layers copper cladding steel (CCS) wires have been systematically investigated by the methods of scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and resistivity testing. The results showed that the Cu and Fe atoms near interface diffused into each other matrixes. The Fe atoms diffused into Cu matrixes and formed a solid solution. The mechanism of solid solution is of substitution type. When the quantity of Fe atoms exceeds the maximum solubility, the supersaturated solid solution would form Fe clusters and decompose into base Cu and α-Fe precipitated phases under certain conditions. A few of α-Fe precipitates was observed in the copper near Cu/Fe interfaces of cold-drawn CCS wires, with 1–5 nm in size. A number of α-Fe precipitates of 1–20 nm in size can be detected in copper near Cu/Fe interfaces of CCS wires annealed at 850°C. When annealing temperature was less than 750°C, the resistivity of CCS wires annealed was lower than that of cold-drawn CCS wires. However, when annealing temperature was above 750°C, the resistivity of CCS wires was greater than that of cold-drawn CCS wires and increased with rising the annealing temperature. The relationship between nanoscale α-Fe precipitation and resistivity of CCS wires has been well discussed. 相似文献
8.
Thermal conductivity plays a critical role in the thermal transport of thermal-sprayed coatings. In this article, a combined
image analysis and finite-element method approach is developed to assess thermal conductivity from high-resolution scanning
electron microscopy images of the coating microstructure. Images are analyzed with a collection of image-processing algorithms
to reveal the microscopic coating morphology. The processed digital image is used to generate a two-dimensional finite-element
mesh in which pores, cracks, and the bulk coating material are identified. The effective thermal conductivity is then simulated
using a commercial finite-element code. Results are presented for three coating material systems [yttriastabilized zirconia
(YSZ), molybdenum, and NiAl], and the results are found to be in good agreement with the experimental values obtained using
the laser flash method. The YSZ coatings are also annealed, and the analysis procedure was repeated to determine whether the
technique can accurately assess changes in coating morphology.
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, 2006. 相似文献
9.
The microstructure evolution of carbon/copper (C/Cu) films and its relation to the variation of film electrical resistivity has been studied. The films doped with copper in the range of 1.4-22.6 at.% Cu, were deposited by dc magnetron sputtering of composite graphite-copper target. The microstructure of films was studied by Raman spectroscopy and electron diffraction. The electrical resistivity was measured parallel and perpendicular to the substrate surface. The introducing of copper atoms into carbon matrix which consists of disordered graphite-like nano-clusters results in additional distortion of film microstructure at low copper content and some ordering of it at high copper content. At low copper concentrations the additional distortion of graphite-like clusters prevails over the input to electrical conductivity from copper atoms thus increasing the electrical resistivity of C/Cu films. At high copper concentrations the input to electrical conductivity is predominant and the film resistivity decreases. 相似文献
10.
F. Grtner T. Stoltenhoff J. Voyer H. Kreye S. Riekehr M. Koak 《Surface & coatings technology》2006,200(24):6770-6782
The present investigation compares the mechanical properties of cold-sprayed and thermally sprayed copper coatings. The mechanical properties of the Cu-coatings are determined by in plane tensile test using micro-flat tensile specimen technique. A deeper view into the type of obtained defects, their stability and their influence on coating performance, is supplied by subsequent failure analyses and the comparison to annealed copper coatings. The results demonstrate that cold-sprayed coatings, processed with helium as propellant gas, show similar performance as highly deformed bulk copper sheets and respective changes in properties after annealing. In the as-sprayed condition, cold-sprayed coatings processed with nitrogen and thermally sprayed coatings show rather brittle behavior. Whereas subsequent annealing can improve the properties of the cold-sprayed coating, processed with nitrogen, such heat treatments have only minor influence on the tensile properties of thermally sprayed copper coatings. The investigation of failure modes for the as-sprayed states and after different heat treatments provided further information concerning particle–particle bonding and the effect of oxides on mechanical properties. 相似文献
11.
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
12.
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
13.
The plasma sprya deposition of a zirconia thermal barrier coating (TBC) on a gas turbine component was examined using analytical
and experimental techniques. The coating thickness was simulated by the use of commercial off-line software. The impinging
jet was modeled by means of a finite difference elliptic code using a simplified turbulence model. Powder particle velocity,
temperature history, and trajectory were calculated using a stochastic discrete particle model. The heat transfer and fluid
flow model were then used to calculate transient coating and substrate temperatures using the finite element method. The predicted
thickness, temperature, and velocity of the particles and the coating temperatures were compared with these measurements,
and good correlations were obtained. The coating microstructure was evaluated by optical and scanning microscopy techniques.
Special attention was paid to the crack structures within the top coating. Finally, the correlation between the modeled parameters
and the deposit microstructure was studied.
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
14.
Formation of NiAl Intermetallic Compound by Cold Spraying of Ball-Milled Ni/Al Alloy Powder Through Postannealing Treatment 总被引:1,自引:0,他引:1
Qiang Zhang Chang-Jiu Li Xiu-Ru Wang Zhi-Liang Ren Cheng-Xin Li Guan-Jun Yang 《Journal of Thermal Spray Technology》2008,17(5-6):715-720
Ni/Al alloy powders were synthesized by ball milling of nickel-aluminum powder mixture with a Ni/Al atomic ratio of 1:1. Ni/Al alloy coating was deposited by cold spraying using N2 as accelerating gas. NiAl intermetallic compound was evolved in situ through postspray annealing treatment of cold-sprayed Ni/Al alloy coating. The effect of annealing temperature on the phase transformation behavior from Ni/Al mechanical alloy to intermetallics was investigated. The microstructure of the mechanically alloying Ni/Al powder and NiAl coatings was characterized by scanning electron microscopy and x-ray diffraction analysis. The results show that a dense Ni/Al alloy coating can be successfully deposited by cold spraying using the mechanically alloyed powder as feedstocks. The as-sprayed alloy coating exhibited a laminated microstructure retained from the mechanically alloying powder. The annealing of the subsequent Ni/Al alloy coating at a temperature higher than 850 °C leads to complete transformation from Ni/Al alloy to NiAl intermetallic compound. 相似文献
15.
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
16.
Microstructural Studies of Cold Sprayed Copper,Nickel, and Nickel-30% Copper Coatings 总被引:1,自引:0,他引:1
Heli Koivuluoto Juha Lagerbom Petri Vuoristo 《Journal of Thermal Spray Technology》2007,16(4):488-497
Cold spraying enables to produce metallic coatings with low porosity level and low oxygen content. Several material properties
such as electrical conductivity and corrosion resistance rely on these properties. Aim of this study was to characterize microstructural
properties of cold sprayed copper, nickel, and nickel-30%copper coatings. Microstructures, denseness, and deformation of particles
were investigated. SEM analysis and corrosion tests were done to get information of through-porosity. Open porosity has an
important role on protectiveness of anodically protective coatings, such coating materials like copper and nickel. In this
study, cold-sprayed Cu coating was fully dense. However, cold-sprayed Ni and Ni-30%Cu coatings seemed to be microstructurally
dense but some porosity in some areas of the coatings especially in some parts of particle boundaries was noticed after corrosion
tests. Furthermore, effect of annealing to microstructure and corrosion test behavior was studied. Cold sprayed Ni coating
became denser during heat treatment. 相似文献
17.
The deposition of copper by cold gas dynamic spraying has attracted much interest in recent years due to the capability to
deposit low-porosity oxide-free coatings. However, it is generally found that as-deposited copper has a signicantly greater
hardness, and potentially lower ductility, than bulk material. In this article, copper was deposited by cold spraying using
helium as the driving gas at both 298 and 523 K. Evidence is presented indicating that the material sprayed at the lower temperature
exhibits a lower dislocation density throughout the grain structure than the material sprayed at the higher temperature. The
low stacking fault energy of copper restricts recovery during annealing, and thus microstructural changes during annealing
only proceed once recrystallization begins. The material sprayed at low temperature (with the low dislocation density) exhibited
recrystallization at annealing temperatures as low as 373 K with a corresponding reduction in hardness. However, the copper
sprayed with helium at 523 K was resistant to annealing at temperatures up to 473 K where the dislocations in the structure
prevented recrystallization. However, at higher temperatures, recrystallization did proceed (with corresponding reductions
in hardness). The fracture behavior of the copper that was cold sprayed with helium at 523 K, both in the as-sprayed condition
and following annealing, was measured and explained in terms of the annealing mechanisms proposed.
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
18.
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
19.
Characterization of YSZ solid oxide fuel cells electrolyte deposited by atmospheric plasma spraying and low pressure plasma spraying 总被引:1,自引:0,他引:1
C. Zhang H. L. Liao W. Y. Li G. Zhang C. Coddet C. Zhang C. J. Li C. X. Li X. J. Ning 《Journal of Thermal Spray Technology》2006,15(4):598-603
Yttria doped zirconia has been widely used as electrolyte materials for solid oxide fuel cells (SOFC). Plasma spraying is
a cost-effective process to deposit YSZ electrolyte. In this study, the 8 mol% Y2O3 stabilized ZrO2 (YSZ) layer was deposited by low pressure plasma spraying (LPPS) and atmospheric plasma spraying (APS) with fused-crushed
and agglomerated powders to examine the effect of spray method and particle size on the electrical conductivity and gas permeability
of YSZ coating. The microstructure of YSZ coating was characterized by scanning electron microscopy and x-ray diffraction
analysis. The results showed that the gas permeability was significantly influenced by powder structure. The gas permeability
of YSZ coating deposited by fused-crushed powder is one order lower in magnitude than that by agglomerated powder. Moreover,
the gas permeability of YSZ deposited by LPPS is lower than that of APS YSZ. The electrical conductivity of the deposits through
thickness direction was measured by potentiostat/galvanostat based on three-electrode assembly approach. The electrical conductivity
of YSZ coating deposited by low pressure plasma spraying with fused-crushed powder of small particle size was 0.043 S cm−1 at 100 °C, which is about 20% higher than that of atmospheric plasma spraying YSZ with the same powder.
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 radial injection gas dynamic spray (RIGDS) technology of powder coatings deposition was considered for this work. A coating
was created by injecting powders with variable compositions into a supersonic air jet and depositing powder on the substrate.
This study describes the preliminary analysis of an air gas dynamic spray method realized by a portable RIGDS apparatus with
a radial injection of powder. Attention was given to shock compaction processes during the coating structure formation and
examples of powder mixtures utilization in RIGDS. It was shown that the operational parameters of supersonic powder-gas jet
have a significant influence on the coating's microstructure, thus defining the high performance of the coating. Compaction
and bonding of particles were analyzed.
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