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Porous architecture of SPS thick YSZ coatings structured at the nanometer scale (~ 50 nm)

Abstract : Suspension plasma spraying (SPS) is a fairly recent technology that is able to process sub-micrometersized or nanometer-sized feedstock particles and permits the deposition of coatings thinner (from 20 to 100 lm) than those resulting from conventional atmospheric plasma spraying (APS). SPS consists of mechanically injecting within the plasma flow a liquid suspension of particles of average diameter varying between 0.02 and 1 lm. Due to the large volume fraction of the internal interfaces and reduced size of stacking defects, thick nanometer- or sub-micrometer-sized coatings exhibit better properties than conventional micrometer-sized ones (e.g., higher coefficients of thermal expansion, lower thermal diffusivity, higher hardness and toughness, better wear resistance, among other coating characteristics and functional properties). They could hence offer pertinent solutions to numerous emerging applications, particularly for energy production, energy saving, etc. Coatings structured at the nanometer scale exhibit nanometer-sized voids. Depending upon the selection of operating parameters, among which plasma power parameters (operating mode, enthalpy, spray distance, etc.), suspension properties (particle size distribution, powder mass percentage, viscosity, etc.), and substrate characteristics (topology, temperature, etc.), different coating architectures can be manufactured, from dense to porous layers, from connected to non-connected network. Nevertheless, the discrimination of porosity in different classes of criteria such as size, shape, orientation, specific surface area, etc., is essential to describe the coating architecture. Moreover, the primary steps of the coating manufacturing process affect significantly the coating porous architecture. These steps need to be further understood. Different types of imaging experiments were performed to understand, describe and quantify the pore level of thick finely structured ceramics coatings.
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https://hal.archives-ouvertes.fr/hal-00451160
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Submitted on : Thursday, January 28, 2010 - 1:55:26 PM
Last modification on : Wednesday, February 14, 2018 - 4:29:43 PM

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A. Bacciochini, Ghislain Montavon, J. Ilavsky, Alain Denoirjean, Pierre Fauchais. Porous architecture of SPS thick YSZ coatings structured at the nanometer scale (~ 50 nm). Journal of Thermal Spray Technology, ASM International/Springer, 2010, 19, pp.198-206. ⟨10.1007/s11666-009-9429-8⟩. ⟨hal-00451160⟩

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