Understanding of suspension DC plasma spraying of finely structured coatings for SOFC

Fauchais, Pierre; Rat, Vincent; Delbos, C.; Coudert, Jean-François; Chartier, Thierry; Bianchi, L.

doi:10.1109/tps.2005.845094

Cited by 93 publications

(45 citation statements)

References 20 publications

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“…SPS samples showed a reduction in coating thickness compared to APS samples. A direct relation between coating thickness, solid particle mass ratio and feedstock size particle, was evident in SPS samples, which is consistent with Fauchais P. et al [22] observations. SEM/BSE micrograph, Fig.…”

Section: Ii) Limited Resolution In Semsupporting

confidence: 91%

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Sliding Wear Behavior of Al2O3–TiO2 Coatings Fabricated by the Suspension Plasma Spraying Technique

et al. 2015

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Abstract:In this study, friction and dry sliding wear behavior of alumina and alumina-titania nearnanometric coatings have been studied. Coatings were obtained by Suspension Plasma Spraying (SPS) technique. Dry sliding wear tests were performed in an a tribometer with a ball on disk configuration, using a Al2O3 ball as a counterpart with a normal load of 2N, a sliding distance of 1200m and a sliding speed of 0.1 m/s. The influence of TiO2 addition in fabricated coatings was related with friction coefficient behavior, wear rates and wear damage patterns. A remarkable increment in wear resistance was founded by the TiO2 addition effect, in 2.6 times for the biggest amount. The analysis of wear surface was correlated with microstructural parameters, mechanical properties and wear rates.

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Section: Ii) Limited Resolution In Semsupporting

confidence: 91%

“…Hence, an increase in addition of TiO 2 reduced coating thickness. This relation can be associated with the lower melting point and specific heat of TiO 2 in comparison to Al 2 O 3 [13,17,22]. APS data samples presented by Pawlowski L. et al [9] and Xiao D. et al [10] were compared with SPS samples obtained in this study.…”

Section: Ii) Limited Resolution In Semmentioning

confidence: 79%

Sliding Wear Behavior of Al2O3–TiO2 Coatings Fabricated by the Suspension Plasma Spraying Technique

et al. 2015

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“…To produce finely structured ceramic or cermet (WCCo) coatings of sub-micrometer-sized or nanometer-sized particles a suspension of these particles is thermally sprayed (Ref 79,(163)(164)(165)(166). Spray conditions are somewhat more complex than those of conventional spraying because the suspension penetration within the hot gases jet, its fragmentation and resulting droplets penetration within the hot gases jet, the cooling of the hot gases and the very low inertia of sub-micrometer-sized or nanometersized particles, both implying very short spray distances (between 30 and 50 mm against 100-120 mm in conventional spraying), see the review of Fauchais et al (Ref 79).…”

Section: Coatings From Nanometer-sized Sprayedmentioning

confidence: 99%

From Powders to Thermally Sprayed Coatings

2009

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Since the early stages of thermal spray, it has been recognized that the powder composition, size distribution, shape, mass density, mechanical resistance, components distribution for composite particles play a key role in coating microstructure and thermo mechanical properties. The principal characteristics of particles are strongly linked to the manufacturing process. Coatings also depend on the process used to spray particles and spray parameters. Many papers have been devoted to the relationships existing between coating properties and structures at different scales and manufacturing processes. In many conventional spray conditions resulting in micrometric structures, among the different parameters, good powder flow ability, and dense particles are important features. Thermal plasma treatment, especially by RF plasma, of particles, prepared by different manufacturing processes, allows achieving such properties and it is now developed at an industrial scale. Advantages and drawbacks of this process will be discussed. Another point, which will be approached, is the self-propagating high-temperature synthesis, depending very strongly upon the starting composite particle manufacturing. However, as everybody knows, ''small is beautiful'' and nano-or finely structured coatings are now extensively studied with spraying of: (i) very complex alloys containing multiple elements which exhibit a glass forming capability when cooled-down, their under-cooling temperature being below the glass transition temperature; (ii) conventional micrometer-sized particles (in the 30-90 lm range) made of agglomerated nanometersized particles; (iii) sub-micrometer-or nanometer-sized particles via a suspension in which also, instead of particles, stable sol of nanometer-sized particles can be introduced; and (iv) spray solutions of final material precursor. These different processes using plasma, HVOF or sometimes flame and also cold-gas spray will be discussed together with the production of nanometer-sized particles via the chemical reaction method or by a special type of milling: the cryogenic milling process often referred to as ''cryomilling.''

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“…Las partículas sólidas obtenidas en estas dos etapas, fragmentación y evaporación, se calientan y aceleran hasta llegar al sustrato precalentado. Se aplastan sobre él en un estado fundido o semifundido formando el recubrimiento [44]. El uso de polvo de granulometría submicrométrica o nanométrica limita los espesores a 20 μm.…”

Section: Inyección Del Líquidounclassified

Influence of Plasma Intensity on Wear and Erosion Resistance of Conventional and Nanometric WC-Co Coatings Deposited by APS

et al. 2010

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A mis abuelos Yuri Ivanovich y Lilia Macarovna. AGRADECIMIENTOSQuiero expresar mis más sinceros agradecimientos a mis directores de tesis, la Dra.María Dolores Salvador Moya y el Dr. Emilio Francisco Segovia López por guiarme en este trabajo, por su atención y por los conocimientos que me han transferido.Al Dr. Vicente Amigó Borrás, por haber seguido mis primeros pasos y haber proporcionado su estimable apoyo en todo momento.Asimismo quiero agradecer al gobierno de la Generalitat Valenciana por financiar mis estudios de doctorado y el periodo de investigación, así como por la ayuda de viaje para la estancia en el centro de investigación en el extranjero.Al Dr. Enrique Sánchez Viches y a los técnicos Emilie Bannier y Mónica Vicent del Instituto Cerámica de Castellón por la realización de los recubrimientos por ASP y por su enorme colaboración en la investigación.Al Dr. Eduardo Martínez Tamayo y a su equipo, del instituto de materiales de la Universidad de Valencia, por haber puesto a nuestra entera disposición los medios necesarios para poder avanzar en las investigaciones necesarias para la realización de la presente tesis doctoral. Ángeles, por su gran ayuda la hora de solucionar los apuros propios del día a día. RESUMENUna de las principales tareas de la ciencia de los materiales es la mejora de las propiedades mecánicas y tribológicas en las piezas de máquinas a través de la protección superficial. La utilización de los recubrimientos cerámicos en la industria permite el incremento en la fiabilidad de la maquinaria técnica existente, la reducción del coste de mantenimiento y la prolongación de su vida útil. Una de las tecnologías con mayor potencial en este campo es la proyección térmica de polvos. La disminución de la escala del tamaño de partícula de los polvos de partida para la fabricación del recubrimiento hasta niveles submicrométricos y nanométrico mejora significativamente su tenacidad, dureza y resistencia al desgaste.Existen muchas técnicas de proyección térmica, sin embargo, por numerosas causas la proyección de suspensiones por plasma SPS es la única técnica desarrollada hasta el momento que permite proyectar directamente las partículas en suspensión. Esta es una técnica versátil, fácilmente adaptada a la industria y de menor coste económico que permite obtener recubrimientos cerámicos de diferentes composiciones.En esta investigación se presenta un estudio de la microestructura y las propiedades mecánicas de los recubrimientos cerámicos de base alúmina-titania (87% Al 2 O 3 -13% TiO 2 ) obtenidos por la proyección de suspensiones por plasma atmosférico utilizando como material de partida polvos con tamaños de partícula submicrométrico y nanométrico. Se utilizaron dos métodos de proyección para obtener los recubrimientos, proyección por plasma atmosférico (APS) y proyección de suspensiones por plasma (SPS).Se ha conseguido obtener un recubrimiento que mantiene una microestructura a escala nanométrica solamente por el método de SPS. Se ha demostrado que las propiedades de los materiales estudiados ...

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Understanding of suspension DC plasma spraying of finely structured coatings for SOFC

Cited by 93 publications

References 20 publications

Sliding Wear Behavior of Al2O3–TiO2 Coatings Fabricated by the Suspension Plasma Spraying Technique

Sliding Wear Behavior of Al2O3–TiO2 Coatings Fabricated by the Suspension Plasma Spraying Technique

From Powders to Thermally Sprayed Coatings

Influence of Plasma Intensity on Wear and Erosion Resistance of Conventional and Nanometric WC-Co Coatings Deposited by APS

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