Particle Loading Effect in Cold Spray

La proyección fría es una tecnología novedosa para la obtención de recubrimientos y recargues, que se incluye en el campo de la proyección térmica. Debido a que las temperaturas de trabajo son relativamente bajas (siempre por debajo de los puntos de fusión del material), es una técnica ideal para depositar materiales sensibles a la temperatura como materiales nanoestructurados, amorfos o reactivos al oxígeno.La reducción en los costes (materia prima, gases…), la disminución de los tratamientos superficiales (pre-proyección como post-proyección), el aumento de la vida útil de las piezas en servicio, la disminución de los problemas asociados a la fusión del material proyectado (oxidación, corrosión, tensiones residuales a tracción…), el mantenimiento de las estructuras de partida, etc., han hecho de la proyección fría una técnica de proyección eficiente, más ecológica y económicamente más asequible que las técnicas de proyección y de deposición convencionales.

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“…Las principales variables que se deben tener en cuenta a la hora de llevar a cabo una proyección son [13][14][15][16][17][18] :…”

Section: Variables Del Procesounclassified

La proyección fría (CGs): Una alternativa a las tecnologías convencionales de deposición

Villa¹,

Dosta²,

Fernández³

et al. 2012

REVMETAL

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“…Chemical reactions between particles and ambient gas have also been considered with reactions due to diffusion (Vardelle et al, 1996) or convection (Neiser et al, 1998) and also reactions related to self-propagating high-temperature synthesis (Borisova and Borisov, 2008). The injection of a powder with particle size range, and not only a single particle, has also been considered (Samareh and Dolatabadi, 2007;Meillot and Balmigere, 2008), as well as the loading effect due to an increase in the powder feeding rate in RF plasmas (Proulx et al, 1985), in HVOF flame spray (Taylor et al, 2006) (even if with less than 4% of the gas mass flow rate, it can be assumed that the presence of particles will have a negligible effect), and in cold spray (Taylor et al, 2006). The injection of a powder with particle size range, and not only a single particle, has also been considered (Samareh and Dolatabadi, 2007;Meillot and Balmigere, 2008), as well as the loading effect due to an increase in the powder feeding rate in RF plasmas (Proulx et al, 1985), in HVOF flame spray (Taylor et al, 2006) (even if with less than 4% of the gas mass flow rate, it can be assumed that the presence of particles will have a negligible effect), and in cold spray (Taylor et al, 2006).…”

Section: Particles In-flightmentioning

confidence: 99%

Current status and future directions of thermal spray coatings and techniques

Fauchais¹

2015

Future Development of Thermal Spray Coatings

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“…This means that continuously increasing the feeding rate of the particles will not necessarily lead to a higher coating thickness. Also, it has been shown that increasing the powder mass flow rate can cause excessive particle bombardment which can lead to the peeling of the coating as a result of excessive residual stress [51].…”

Section: Powder Feeding Ratementioning

confidence: 99%

Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing

et al. 2015

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Aluminum and aluminum-alumina powder mixtures were used to produce pyramidal fin arrays on aluminum substrates using cold spray as an additive manufacturing process. Using aluminum-alumina mixtures instead of pure aluminum powder could be seen as a costeffective measure, preventing nozzle clogging. The fin geometries that were produced were observed using a 3D digital microscope to determine the flow passages width and fins geometric details. Heat transfer and pressure tests were carried out using different ranges of appropriate Reynolds numbers for the sought commercial application to compare each fin array and determine the effect of alumina content. It was found that the presence of alumina reduces the fins' performance when compared to pure aluminum but that they still outperform traditional fins. Numerical simulations were performed and were used to explain

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Particle Loading Effect in Cold Spray

Cited by 29 publications

References 16 publications

La proyección fría (CGs): Una alternativa a las tecnologías convencionales de deposición

La proyección fría (CGs): Una alternativa a las tecnologías convencionales de deposición

Current status and future directions of thermal spray coatings and techniques

Influence of Alumina Addition to Aluminum Fins for Compact Heat Exchangers Produced by Cold Spray Additive Manufacturing

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