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Article Dans Une Revue Thermal Spray 2012: Proceedings of the International Thermal Spray Conference (ASM International) Année : 2012

Thermal diffusivity and conductivity of yttria stabilized zirconia coatings obtained by suspension plasma spraying

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Résumé

Plasma generated by SG-100 torch was applied to spray suspension formulated with the use of ZrO2+8 wt% Y2O3 (8YSZ) solid phase. The solids have the mean size of about 4.5 µm and were obtained by milling of commercial Metco 204 NS powder. The suspension was formulated with the use of 20 wt% of solid phase, 40 wt% water and 40 wt% of ethanol. The plasma spray parameters were optimized with the electric power equal to 40 kW, working gases composition Ar - 45 slpm and H2 - 5 slpm, spray distance varying from 40 to 60 mm and torch scan linear speed varying from 300 to 500 mm/s. The coatings of the thickness ranging from 51 to 106 µm, were sprayed onto stainless steel substrates. The porosity of the samples was found from the image analysis of metallographically prepared cross-sections of the samples to be in the range of 8 - 12 %. Thermal diffusivity was measured with the use of the commercial NanoFlash system in the temperature range from room temperature to 523 K. The measurements were made with the use of the coatings sprayed on the substrate and the 2-layers numerical model was developed to determine thermal diffusivity of the coatings. The diffusivity was in the range from 0.196x10-6 to 0.352x10-6 m2/s in room temperature depending on the spray parameters. The obtained data were then associated with the literature data of density and specific heat and experimental porosity to find thermal conductivity which was in the range of 0.47 to 0.86 W/(mK) at room temperature depending on the spray run.

Domaines

Chimie Matériaux
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Dates et versions

hal-00943501 , version 1 (07-02-2014)

Identifiants

  • HAL Id : hal-00943501 , version 1

Citer

L. Latka, Lech Pawlowski, Stéphane Valette, Bernard Pateyron, Jean-Pierre Lecompte, et al.. Thermal diffusivity and conductivity of yttria stabilized zirconia coatings obtained by suspension plasma spraying. Thermal Spray 2012: Proceedings of the International Thermal Spray Conference (ASM International), 2012, pp.800-804. ⟨hal-00943501⟩
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